We’ve all been there. You’re at the end of a canning project, the jars are out of the canning pot, and are resting on the counter. As you clean up, you notice that there’s one jar that didn’t seal. Or worse yet, none of the jars have sealed. If this has happened to you, two questions probably popped to mind. Why did this happen and what can I do to fix it. Let’s tackle these one at a time.
Why did this happen?
- It could be that your canning pot wasn’t at a full, rolling boil for the entire canning process. Without that full boil, it could be that the jars didn’t fully vent the oxygen in the headspace. Without a thorough venting, there won’t be enough of a pressure differential to cause the vacuum seal to form when the jars come out of the canner.
- Another possibility is that there was a physical barrier to the seal forming. In most cases, this happens when you don’t wipe your rims completely, or some food particle gets pushed out of the jar during processing.
- Sometimes the lids are to blame. Really old lids sometimes loose the ability to create a full seal. And of course, if you’re reusing lids, the chances that they will provide a high quality seal are very low. Additionally, some people are finding that the newer lids made by Ball aren’t sealing as well as they once did. If this is something you are consistently experiencing, consider switching lid manufacturers. I really like the lids made by Superb.
- There was a chip or crack in the rim of your jar. This will prevent a seal every time. You can prevent this simply by carefully looking over your jars before filling and canning.
- Improper headspace. Under or over filling your jars can sometimes cause the seal to fail.
- Occasionally, the rings are the culprit. While it is important to only tighten to fingertip tight to allow the oxygen to vent, if you leave them too lose, that can cause a seal failure.
How to fix it?
The best way to handle jars that failed to seal depends on the product you’re dealing with and how many jars have failed. If you have just one or two jars that failed, the easiest thing to do is to put them in the fridge and eat or share them promptly. The reason for this is that to reprocess jars always results in some loss of product and quality.
When it comes to pickles, trying to reprocess them isn’t ideal, because any additional heat exposure will soften their texture. This is particularly true for cucumber pickles.
When it comes to jams and other sweet preserves, there are more options. If the entire batch has failed to seal, the best method is to open the jars, reheat the jam, prep the jars, use new lids, and reprocess.
If you have just one or two jars that didn’t seal and you don’t want to go with the refrigeration plan, there’s another way. Once the jars have cooled completely, put new lids on the jars (taking care to wipe the rims and make sure that you’re getting the rings tightened properly). Place those room temperature jars in a canning pot of cold water. Bring that pot of water to a boil slowly, so that the contents of the jars heat along with the water. Once it reaches a rolling boil, process as you always do. The jars should seal properly this time around.
The boiled water happened to get lower than the lidds during the 30 min boiling process.Should I start again?
The lids are not coming down.
Yes. They need to be fully submerged in the water to be properly processed.
I canned salsa last night. This morning I checked my jars, 12 hours after pulling from water, I had 2 fail which I expected. All the remaining lids appeared sealed, held when I lifted with them, then 15 minutes later one of them unsealed. Your thoughts?
Also trying to determine if I can pressure seal a sage sausage dressing. Haven’t been able to find any information on that. If I can what would my instructions be? I live at high altitude, would that affect the timing for pressure cooking?
Thanks for any feedback you can provide.
I’m surprised that one of the jars unsealed itself. That’s pretty unusual. And all I can do for the sage sausage dressing is suggest you reference the National Center for Home Food Preservation to see if they have anything like what you might want to do.
I just tried canning apple butter for the third time and my lids bulge up. When I push them down, they stay down, Could this be considered sealed? I tried reprocessing by warming up the butter in the jars and then boiling and then when that didn’t have a different result, I completely started from scratch! I’m afraid if I try to do this again I will compromise the quality of my butter. Any suggestions?
You need the jars to seal on their own. It’s not a reliable seal if you pushed them down. I wonder if you’re not leaving enough headspace.
I canned a hamburger soup and after 18 hours 1 of the jars was not sealed. It was put in the frig. Now, 2 days later I am loading another pressure canner load…can the refrigerated soup safely be reheated and reprocessed?
Yes, you could reheat it and recan it. Just know that the texture might be a bit softer.
I canned pickled garlic and hot peppers. Nothing in my entire batch sealed. After 18 hours on the counter, can I reheat everything and redo it or is the food no longer safe?
You could reheat and reprocess. I’m surprised that the entire batch failed, though.
Does the “syrup” have to totally cover the peaches when canning? I have a few peaches that are exposed.
Ideally the syrup totally covers the fruit. It’s not the end of the world if some of the peaches are exposed, though. I suggest using those jars first.
I made some green tomato pickles and did not put them in a water bath. The recipe didn’t call for processing. Now I’m wondering if I should have processed them. They are fully cooled now. Should I put the in a water bath anyway or is it too late? Please advise.
It’s too late to process the jars once they are fully cooled. At this point, they need to be refrigerated to prevent potential spoilage.
I pressured canned pork meat and within 24 hrs. it sealed. Don’t know exactly when. Is meat safe to eat that could have stayed on the counter for 23 hrs.?
As long as you properly processed it in your pressure canner and the seals are strong, all is well. The chances that it took 23 hours to seal are slim to none.
I just noticed that after 2 years of canning salsa, one of the jars did not seal…should I discard it or take a chance and eat it?
Discard please!
I had some pint jars of meat that did not seal after pressuring canning it. Can I put new mods in it and vacuum seal them. Would they be okay???
No. Those jars need to be refrigerated and used promptly.
Hello!
I am very new to canning, I am only doing water bath recipes at this time. I canned 7 jars of pickled asparagus this evening and I was sure to have 1-1.5 inches of water over the jars during the process time. I lifted the lid only to check that the boiling had started and then did not lift the lid per the instructions for the 15 mins process time (1100 elevation). At the end I lifted the lid and turned off the heat, and sadly I found that the water level decreased to just barely covering the jars. The usda book says the water should be boiling vigorously but even with the lid shut too much water evaporated. Each one pinged as I took it out of the canner. I am leaving them alone for right now because I just took them out an hour ago, but I’m not sure what to do with them. Asparagus is expensive but there’s no way I can reprocess them…I suppose I could freeze them but I fear that will also turn them to mush. A big part of me feels like they are probably fine but I am a big rule follower. Thoughts? Your experience? Also how can I approach the water level issue without overflowing the canner?
They should be just fine. I would feel entirely comfortable with them on the shelf given the fact that they were still barely covered at the end of the processing time.
How do I know the lid is secured properly after cooking on the stove ,are the lids suppose to look different or something I’m brand new and very nervous about the lids I dont want anyone to get sick can you help me with some of your expertise please.
After processing and cooling, the lids should be tightly sealed to the jars and should be slightly concave. You can actually remove the rings and life the jars an inch off the counter while holding onto the edges of the lid.
I made salsa , I made chunky and runny , my chunky didn’t seal, I had to throw it out, I don’t understand why,
Did you follow a tested recipe for the salsa? And you didn’t need to throw it out if it didn’t seal, provided you caught it within 24 hours. You could have refrigerated it or recanned it.
My pressure cannner will not get above 9lbs. I decide after 40 minutes to turn off to figure out problem. But as it depressurized the tops on my ghee jars (jelly size jars) popped. Does this mean they are sealed or do I start over once I figure out the pressure problem?
If they weren’t processed at the proper pressure and for the necessary amount of time, you need to open the jars and start again with new lids.
I canned several thongS but never hear a pop. I lift lids after 24 hours and they don’t move or come loose from jars. I assumed they sealed since lids didn’t come loose. How can I know for sure?
They changed the lids a few years back and they really don’t pop or ping the way they used to it. The test you’re using, where you lift the lids, is the most reliable.
You my dear are a true Saint! You answered so many questions. It is like a full time job.
Thank you.
I’m glad to help! And this site is my full time job!
Put hot jam in hot jars 1/2 sealed rest did not. It’s been 23 hours on the countertop. Can I process them in boiling water? Do I cover the jars and lids with water? How long do I boil For? When do I remove them from the hot water? Should I refrigerate the jam that has not sealed till I can process it? How long can I wait before pricessing???
You can’t just process the jars at this point. You have to open them all up, reheat the jam, reheat the jars, use new lids, and refill and process. For instructions on how to process, please see the post linked to below. And yes, any jars that did not seal should be refrigerated.
https://foodinjars.com/blog/new-to-canning-start-here-boiling-water-bath-canning/
We are first time canners and at the weekend we canned some beef with Potato’s, carrots and onions. 3 of our jars didn’t seal first time so we put them in again and they still didn’t seal.
Are they safe to eat or should we throw away?
I wouldn’t keep that after two rounds in the pressure canner. It’s just too suspect.
First time canning, I followed the recipe/directions and everything went well until I took the jars out of the canner, two of them were dripping water. The lids were loose when I took them out, so I took the lids of to find water had gotten into the jars. Are these still safe to reprocess or do they need to be thrown away. The jar and content were still hot.
It’s pretty normal for jars to siphon a little bit of liquid when they come out of the canner. It’s also normal for the rings to loosen slightly during the canning process. The best thing to do is to wait and see if they seal without disturbing the lid. However, if the jars and their contents seem fine now, they are safe to reprocess.
Just finished a batch of Antipasto and I first tried using the oven at 250 degree for 1 hour to seal and nothing happened. Even pushing the tops and they can back up. I then brought out my old canning pot and did all the jars under boiling water for 1/2 hour. Some of the jars sealed by themselves but most sealed while I was testing to see if they had sealed. Now reading this, I am guessing that I shouldn’t have tried to see if they were sealed? I will leave over night to see if any pop back up but if they do not, do you think they are safe?
Remove the rings and test the seals by gripping the edges of the lids and lifting up. If they seals hold fast, they should be okay.
I only have a pressure canner, and have followed instructions. Yesterday I made 2 batches of applesauce. The first batch of 7 quarts all sealed nicely, and right away, using older jars and new Ball lids. The second batch of 10 pints, new jars and lids (Pur) had only one jar seal! I left them overnight to make sure, and reprocessed them today with a new set of Ball lids. They have been out now for several hours, and only one jar has sealed, by visual inspection. A third batch, made today and processed in quarts, has 5 out of seven sealed already.
Any ideas why this should be? Also, why are we instructed not to push the lids down? I seem to recall my mom did.
I really don’t know why your applesauce isn’t sealing. It could be that the first time, the lids weren’t good. Then, did you fully reheat the applesauce before recanning? You needed to reopen the jars, reheat the sauce, refill, cap and process. Anything else could have left you with insufficient heat to create a solid seal. Good luck with it.
My sister is an avid canner. I helped her make salsa recently – we just cut up the tomatoes and other veggies and put in canning jar. She was low on the canning lids that seal so she sent me home with a plastic twist lid on the
canning jar. She neglected to tell me that since the jar wasn’t technically ‘sealed’ it should be refrigerated. Instead, I put it in my pantry for 5-6 weeks and then ate some. I thought it had an odd flavor so I only ate maybe 3-4 tablespoons..
I contacted her and asked if there could be a problem with it and she apologized saying she should have told me to
refrigerate it. I then threw it out. Unfortunately I have had an issue with diarrhea ever since eating that – 5 days ago.
I doubt that I have botulism but should I be concerned? Have you heard of situations like this?
It wouldn’t be botulism, since that can only grow in environments that are anaerobic (meaning, the jar would have had to have been processed and sealed). It sounds like you have a rip roaring case of food poisoning. If the issue persists, go to the doctor!
I picked 40 qts. Of DILLS, this summer. 9 did not seal. I have been picking for forty yrs. I’ve been thinking about way they didn’t seal. My guess is that no one picked during Covid outbrake so the Lids we are using were manufactured in 2019,an 2020 I bought 2 boxes with 12 in each all the lids were sealed to the jars. So the lid was already used so there no longer good order lids from Amazon and the results were the same jars not sealing.
Tons of people were canning and preserving during the pandemic. But they have changed the lids a bit over the recent past, so perhaps they are different than they used to be.
I have tomato sauce quart jars and diced tomato quart jars that i canned last week that did not seal properly. i put them in the fridge promptly, even though it’s been several days or about a week, can i re-can them? if so, how would you do it? take all the sauce/tomatoes out and re-heat in a pot, and put in newly cleaned/sterilized jars and new lids? or put all the jars cold in cold water in the canner and slowly bring on the heat to heat everything together gradually? (and put new lids on first)
I would open the jars, reheat the sauce, and proceed as if they were a new batch.
I’ve had similar problems this week with a few jars in the same canning pot not sealing even though I thought I followed every instruction properly. I’ve canned jams and relishes off and on for 40 years and never had this problem before, even re-using old lids. Is it possible the new material is just not very robust and can fail more easily? It’s Saturday and I am going to try one more time, but on Monday I’m phoning the manufacturer because I’m so frustrated!
I’m so sorry that you’re having issues. Have you tried letting the rest in the cooling canning pot for 5-10 minutes after the processing time is up? I’ve found that that helps reduce siphoning and creates a more robust seal. When the time is up, turn off the burner and remove the lid. Let the jars sit in that cooling water for a bit!
Fairly new to canning, I decided to make pickles. only 1 of my jars sealed so knowing I could reprocess the next day I took off all the lids put on new lids and reprocessed per directions. Room temp water brought all jars up to boil together process for the correct timeframe (I have to make altitude adjustments). They all sealed. However, I just re-read the instructions in the canning cookbook today (making more pickles) and am seeing that I was supposed to re-pack and re-brine. Are the first ones I reprocessed okay to eat? I didn’t re-pack or re-brine just reprocessed with new lids. Thanks
It is best practice to repack and rebrine, but your pickles should be okay from a safety standpoint. However, double processing pickles really impacts the finished texture, so they might end up being pretty soggy when you go to open the jars. Just be aware that these pickles might be best chopped up and used in applications where you might use relish.
I canned apple butter in pint jars with new lids, one did not pop/seal and i gently pressed it- it stayed down. I unscrewed the ring and the lid is tight, I can lift the whole jar by the lid. It appears sealed. Is this one okay to store? Thank you!
Sometimes, you just happen to touch the lid just as it was going to seal. I might mark that one so that you know to eat it first, but it should be okay.
Hi I made fresh salsa from my garden, and water bath processed for 45 minutes, 12 hours ago. All 8 jars didnt seal, I believe too much head space. Can I freeze without reheating the salsa. I fear, reheating again, will make it mushy. Or should I get new lids and reprocess? Heat salsa first, then reprocess?
You can do either thing. Provided you have enough headspace for the freezer and you used wide mouth jars (never freeze jars with shoulders), the jars can go right into the freezer. Otherwise, open the jars, reheat the salsa, refill, apply new lids, and process according the recipe instructions. One thing you can do to help the jars seal is once the canning time is up, turn off the heat, remove the lid, and let the jars cool slowly in the canner for an additional 5-10 minutes. This helps create a stronger seal and prevent liquid loss upon removal.
Hi, there, I processed 4 quarts of tomato sauce in a pressure canner day before yesterday, late in the evening. All appeared to be sealed. Just now removing the rings to label and store, and two of the jars did not seal. The other two pass the lift test – thankfully. Is the tomato sauce in the unsealed jars safe to use, or should I toss it. It’s been approximately 36 hours. Thanks so much.
I’d feel comfortable putting those in the fridge and using promptly.
How long can whole tomatoes sit and be safe to still eat if didn’t seal. Discovered 36 hours after processing.
As long as you moved it to the fridge as soon as you noticed the seal was bad, they should be okay.
I’m experiencing what I can only think of as a water bath anomaly. Several different batches of different jams, pickled peppers and just recently jelly… appears to be taking in water from the canner. Failed seals and runny contents. I’ve searched for an explanation, to no avail. I thought my lids & rings were ‘finger tight’. Is it possible to not tighten a lid enough & ruin the contents? This is my third summer of canning and first time ever with this specific issue. I’ve had an occasion no-seal in a batch…but this is three or four jars ruined in each batch of different things.
Are you using a different brand of rings or seals? That could be the issue. It may well be that you’re not tightening them tightly enough. Try giving them an extra quarter turn in your next batch.
I used off brand seals and after 2 water baths, 4 out of 7 pints of pickles did not seal. I stuck the 4 in the fridge. I used this recipe last year with no issues using Ball seals. How long will they keep in the fridge? Thank you!
They’ll keep for months if you leave them unopened.
What is the correct amount of headspace to leave for jam or jelly jars as well as pickles before you hot water bath them?
Typically, the recipe should tell you how much headspace to leave. If it doesn’t, 1/4 inch is pretty standard for jams and jellies, and 1/2 an inch is standard for pickles.
I canned cucumber salad which has oil and vinegar for a fluid base. I had trouble getting three of my seals to “pop”. The next day I put on new seals and gave jars another 10 minute bath after boiling from cold water. Will these be safe to store?
I wouldn’t keep the ones you processed for an additional ten minutes from cold on the shelf. That’s not enough processing given that the product was cold when it went into the water. What’s more, those double processed jars are probably going to be super mushy.
I canned pickles last night and they all sealed. I was looking at them this morning and realized I forgot to put dill in two jars.😩Can I open them and put dill in with new lids and reprocess them?
There’s nothing unsafe about what you’re suggesting, but it is going to leave with you with REALLY soft pickles. You probably won’t enjoy them, they’ll be so overcooked.
Last night I canned fresh tomatoes in pint size jars. 9 out of 15 did not seal. When I press on the lid it pops!!! Can I redo and start over in new jars and lids?
Yes.
I make canned strawberry jam every single year. This year the majority of my jars did not seal, I’m pretty sure it’s due to an off-brand defective jars I purchased online. I checked them about 30 hrs after they have been sitting out, when I realized they didn’t seal I put them in the refrigerator. How long will the jam last in the refrigerator? I don’t have time to reprocess but also don’t want it to all go to waste. My mom and siblings said they would take jars and use it quickly but I just want to be sure it’s safe to give them before doing so.
It should keep at least 1-2 months in the fridge. It depends a lot on the sugar content. The higher the sugar, the longer it will keep. If it was a lower sugar recipe or sweetened with honey, it will be a shorter duration.
Raspberry Jelly – Jars popped and sealed as they cooled. However, a day or so
later the lids can be pushed down , as though they did not seal. I have refrigerated the jars that did this. How long is the jelly ok in the frig. Lids very hard to remove even though I think they are not sealed. Will this jelly be ok if NOT put in fridge (want to share with friends) ?
Thank you.
Thanks I’ve decided to eat/share the jars that did not seal!
Made cranberry pepper jelly many times, today is my first attempt at canning using water bath. I’m at approx. hour 6 waiting to see if my jars will seal properly so I started my Google research and end up here. Thank you for all the great info!
Glad to help!
I’m so happy to have found your site! I did my first batch of pressure canning 3 quart jars and 1 pint jar of spiced meatballs. I did have some leakage, I could smell it during the pressure canning, but what can you do but wait to see what you get?
I did hear some a couple of pops once I took them, but I can’t really tell yet which ones because they are too hot, and they look the same.
But my question is about boiling: 1 of the quart and the pint jars were bubbling coming out of the canner, 2 of the the rest of the quart jars were not. Also the rings seemed to be loose on those non-boiling jars.
Is it possible by tomorrow morning the non bubbling ones might seal? Or are the non-bubbling/boiling ones meant for the fridge and eating in the next few days?
If within 24 hours should I try to recan those two?
Thank you so much
Boiling inside the jars is not an indicator of whether a jar will seal or not. You just have to wait and let them cool. If you have some jars that did not seal, it’s not advisable to try and reprocess them. The quality of the food will take a serious hit if you send it through the pressure canner again.
We canned Vegetarian Chili last night. When pulling the jars out of the Pressure Canner, we found juice in the water (assume over boiled from the jars). We found 2 pints of our 4 pints didn’t seal. According to, let sit for 12 hrs, the lids didn’t seal. They sat out over night and I just put them in the fridge. It’s been about 10hrs since taken out of the canner. Are they safe to eat? Not sure if I can recan, due to needing 1/2 inch head space and the only way to do that is to add boiling water to the jars now….not sure if that would be ok.
Typically, as long as you catch a failed seal within 24 hours of the jar being out of the canner, it should still be safe to eat. Because even if the jars didn’t seal, they did just experience prolonged exposure to high temperatures. Anything that could cause spoilage in the immediate term should have been killed.
Hi,
I pressure canned some apple sauce and apple pie filling. Left lots of head room on both. The apple pie filling jars bubbled over. I know I should have water bathed but I prefer pressure canning. I will do the lid test after I wipe off jars. Is there any other options. I will redo the apple sauce all together.
Pie filling and applesauce both have a tendency to siphon on the best day. By applying so much more pressure, you created a scenario where those products were destined to have loss.
So, today I completely failed my canning of green cherry tomatoes. I pulled my green tomatoes last week in anticipation of the snow, quickly read the recipe this morning for pickling, and obviously neglected to read the directions properly. It’s been a day… I used a 50/50 water to vinegar, with salt for the brine, however, for the bath, I didn’t cover the jars with water, I only filled to the bottom of the brim. I also reused seals (clean, of course). Thankfully, only made 2 jars… they need 2 weeks to pickle. If I put them in the fridge, will it be safe to eat them?
Signed, complete canning idiot.
You should be able to put them in the fridge safely and eat them once they are ready.
I just got a new pressure canner and processed a batch of speggetti sauce with meat that siphoned and didn’t seal. New to pressure method been water bathing fruits veggies and jams for years. And first-time doing meat. Can 10 pints be saved?
As long as you caught the seal failures within 24 hours, you can either recan or freeze the sauce. If you do decide to reprocess, make sure to double check your process with the National Center for Home Food Preservation. https://nchfp.uga.edu/publications/uga/using_press_canners.html
Made24 jars of salsa yesterday and two did not seal can I reprocessed them for the 40 minutes that calls for the first time thanks
Glad I could help.
Hi! I canned a batch of pepper jelly in half-pint jars. I used brand new jars with the lids and rings that came with them. I was very careful to clean the rims before placing the lids. They did not seal. What can I do?
The section of this blog post called How to Fix It should be able to help you out.
Hi I am very new to canning and processed a batch of chili in my canner. The lids popped down. Now I am reading that chili should be canned in pressure canner. If the seal is down is the chili safe to consume?
It is not at all safe. Low acid products like your chili can be the ideal environment for botulism spores to germinate into a dangerous toxin. Your chili should be thrown out immediately.
I just discovered today (Wednesday), one jar from a batch of jam made on Sunday,
had not sealed properly – glued but not sealed i.e. the lid pops back up when pressed on. Is this safe to consume? I’ve put it in the fridge for now but is three days too long to be safe?
It should be fine. If it does start to go bad, it will either start to mold or ferment. You’ll notice either one of those issues before eating, so you won’t accidentally eat something dangerous.
Made Sandwich Spread yesterday, Green tomatoes, peppers, onions, etc and mayo added at the end and boiled for an extra 5 minutes. Discoverd this morning that some looked like the didn’t seal. Pushed the center down and it stayed down, took the ring off and the lid did not come up, asuming it is sealed. Are the safe to keep? My concern is its been over 12 hours. Any thoughts?
Keith
Were you following a tested recipe? I don’t know of any canning approved recipe that includes mayo. I would discard immediately.