How to Can Blackberry Jam
Deep, dark blackberry jam from fresh blackberries.
The Short Answer
Blackberry jam is water bath canned. Process half-pints and pints for 10 minutes.
Canning Method at a Glance
Source: USDA NCHFP | Last verified: March 30, 2026
Water Bath Canning Blackberry Jam
Strain for seedless jelly or leave seeds for jam.
Headspace: 0.25 inches
Step-by-Step: Canning Blackberry Jam
- Wash and crush blackberries.
- For jam: use with seeds. For jelly: strain through cheesecloth.
- Follow pectin recipe. Boil. Add sugar. Boil 1 minute.
- Skim foam. Ladle into hot jars. Wipe rims, apply lids.
For a compromise on seeds, strain about half the crushed berries. You get smoother jam but keep some rustic character.
Safety Notes
Important: High-acid and safe for water bath canning.
The Bottom Line
Blackberry Jam can be safely canned in a boiling water bath. Always use tested recipes from the USDA, Ball, or university extension programs. Follow processing times exactly, and adjust for your altitude if you live above 1,000 feet. When in doubt about any canning procedure, consult the USDA National Center for Home Food Preservation at nchfp.uga.edu.
Frequently Asked Questions
Press through fine-mesh strainer or cheesecloth. For completely seedless jelly, use a jelly bag and let drip overnight.