What to Do When a Jar Breaks During Canning — Key Takeaways
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What to Do When a Jar Breaks During Canning
Homesteading Family3mAug 26, 2026
Watch the originalPrevent jar breakage by keeping jars warm before filling, using a canning rack, and tapping jars to listen for a clear ring versus a dull thud indicating cracks.
Key takeaways
Temperature shock — not defects — causes most jar breakage during canning
Temperature shock — not defects — causes most jar breakage during canning
- Cold jar + hot liquid + hot water bath triggers rapid glass expansion/contraction
- Fix: keep jars warm before filling and never set hot jars on cold countertops
Tap jars and listen: a clear ring means safe, a dull thud means hidden crack
Tap jars and listen: a clear ring means safe, a dull thud means hidden crack
- Cracks and chips can hide in glass seams — visual inspection alone misses them
- Sound test catches compromised jars before they break during canning
Skipping a canning rack lets jars bounce on the pot bottom and break
Skipping a canning rack lets jars bounce on the pot bottom and break
- Direct contact with the pot bottom creates vibration stress during boiling
- Jars touching each other also create pressure points that cause breakage
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In this video
- 1mTemperature Shock: The Primary Cause of Jar Breakage
- 1mInspecting Jars for Cracks and Chips
- 2mPreventing Pressure Points: Spacing and Canning Racks
- 3mFree Troubleshooting Resource
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