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When it comes to home canning, properly sterilizing your jars is an important step to help ensure safe, long-lasting results.
Sterilizing jars helps eliminate bacteria and microorganisms that can lead to spoilage. The process is simple and only takes a few extra minutes, but it can make a big difference in your final results.
If you’re new to canning, be sure to read my water bath canning for beginners guide and see the canning supplies you need here before getting started.
Do You Need to Sterilize Canning Jars?
Yes—sterilizing jars is a simple step that helps ensure your food stays safe and shelf-stable.
Even though jars are cleaned before use, sterilizing them gives you an extra layer of protection by removing any remaining bacteria.
Steps:
- Wash jars in hot, soapy water and rinse well
- Place jars in a large pot or water bath canner
- Fill with water, covering jars by at least 1 inch
- Bring to a boil
- Boil for 10 minutes
- Carefully remove jars and place on a clean towel
Keep jars hot until ready to fill.
Dishwasher Sterilization Method
You can also sterilize jars using your dishwasher.
Steps:
- Place clean jars in the dishwasher
- Run on the hottest cycle
- Use a heated dry setting if available
- Leave jars in the dishwasher until ready to use
This method is especially helpful when working with a large batch.
Preparing Jars for Canning
Before sterilizing, always:
Inspect jars
Check for cracks, chips, or damage. Discard any damaged jars.
Clean thoroughly
Wash jars, lids, and bands in hot, soapy water and rinse well.
Clean jars are essential for safe canning.
Filling and Sealing Jars
Once your jars are sterilized:
- Place jars on a clean towel
- Fill with prepared food, leaving proper headspace
- Remove air bubbles
- Wipe rims clean
- Apply lids and screw bands fingertip tight
Use a funnel to keep jar rims clean (see recommended canning tools here).
Frequently Asked Questions
How long do you boil jars to sterilize them?
Boil jars for 10 minutes. Adjust for altitude if needed.
Can I sterilize jars in the oven?
No, oven sterilization is not recommended. Dry heat can cause jars to break.
Dishwasher Sterilization Method
To sterilize canning jars in the dishwasher, first, disassemble the jars and place them in the dishwasher. Use the hottest setting and a heated drying cycle. Ensure the jars are completely dry before use.
Can I sterilize jars without a canner?
Yes, you can use a large pot or your dishwasher.
How do I keep jars clean after sterilizing?
Handle jars carefully and avoid touching the inside or rim before filling.
More Canning Resources
If you’re learning to can, these guides will help:
You can also browse all of my canning recipes here for more ideas.
Follow my canning and preserving board on Pinterest.
