Sterilizing Jars for Home Canning
Submerge clean glass jars in a pot of boiling water for ten minutes, keeping them hot until the moment you fill them. This removes microscopic debris and ensures the glass can withstand the heat of your product without shattering.
Consistency is your primary defense against spoilage.
Only use jars designed for canning, as standard glass or recycled jars often lack the thermal shock resistance needed for boiling water baths.
- Large stockpot with a rack
- Jar lifter tongs
- Clean kitchen towel
Keep the glass hot
Never pull a jar out of the boiling water long before you fill it. The transition from boiling hot jar to room temperature causes unnecessary stress, and cold jars will crack the moment they touch your hot preserve.
The method.
Inspect the jars
Check the rims of your jars for any hairline cracks or chips. If a finger catches on a nick, that jar is not safe for canning and should be discarded.
Submerge and boil
Place the rack in the bottom of your stockpot and set the jars upright. Fill the pot with enough water to cover the tops of the jars by at least one inch. Bring to a rolling boil and time for ten minutes.
Maintain heat
Turn the heat down to low once the ten minutes have passed. Keep the jars in the hot water until you are ready to ladle your recipe inside.
Drain and fill
Use your jar lifter to remove one jar at a time. Tip it slightly to pour out the excess water, then place it on a towel and fill it immediately while the glass is still searing hot.
When it doesn't go to plan.
Always sterilize more lids and rings than you think you need.
If you live at high altitude, add one minute of boiling time for every 1,000 feet above sea level.
Don't boil the rubber seals; a quick rinse in hot, not boiling, water keeps the integrity of the sealant intact.
The ones that keep coming up.
Can I use the dishwasher to sterilize my jars?
Yes, provided your dishwasher has a sanitizing cycle that maintains high heat. Run the jars through the cycle and leave them inside until you are ready to fill them.
Why does the jar need to be hot?
When you put hot food into a cold jar, the temperature shock can cause the glass to crack or explode. Matching the temperature of the food and the jar is essential for safety.
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