Small Batch Canning Blackberry Jam 🍇

Joyce

0 1 3 minutes read

A simple, flavorful jam recipe perfect for beginners and small harvests.

There’s nothing quite like opening a jar of homemade blackberry jam in the middle of winter — the smell alone brings you straight back to warm summer days. This small batch blackberry jam recipe is perfect if you have a modest amount of berries or want to make a variety of jam flavors without committing to a huge pot.

The recipe makes 4–5 half-pint jars, which is ideal for gifting, stocking your pantry, or testing out new jam flavors without overwhelming your shelves. You can use fresh or thawed blackberries, and it works whether you’re using an automatic jam maker or making everything on the stovetop.

🍇 Ingredients

(Makes 4–5 half-pints)

2 ⅔ cups crushed blackberries (measure after crushing)
3 ⅓ cups sugar
3 tbsp powdered pectin
½ tsp butter (reduces foam)

🔪 Instructions

Below are both automatic jam maker instructions and stovetop instructions — use whichever method you prefer.

🍇 Method 1: Using an Automatic Jam/Jelly Maker

1. Prep the Berries

Blend or pulse your blackberries until crushed.
Measure AFTER crushing — whole berries and crushed berries differ in volume.

2. Load the Jam Maker

Sprinkle pectin evenly inside the jam maker.
Add crushed berries and the butter.

3. Start the Cycle

Press Jam, then Enter (should show ~21 minutes).
After 4 minutes, the machine will beep. Add the sugar and place the lid back on.

4. Let the Jam Maker Work

It will stir, cook, and thicken the jam on its own.
When finished, it will beep again.

5. Fill the Jars

Remove stirrer carefully using a potholder.
Ladle hot jam into warm jars leaving ¼-inch headspace.
Wipe rims, add lids, and tighten bands finger-tight.

6. Process the Jars

Water bath for 10 minutes.
Remove jars, cover with a towel, and let cool 12–24 hours.

🍇 Method 2: Stovetop Blackberry Jam

1. Cook the Jam

Add crushed berries and pectin to a large pot (a Dutch oven works best).
Bring to a hard rolling boil over high heat, stirring constantly.

2. Add Sugar & Butter

Add sugar and butter.
Return to a full rolling boil for 1 minute, stirring continuously.

3. Jar & Process

Ladle hot jam into jars leaving ¼-inch headspace.
Clean rims, add lids, tighten bands.
Water bath for 10 minutes, then cool for 12–24 hours before checking seals.

💡 Tips for Perfect Blackberry Jam

Measure berries after crushing. Whole berries take up more space and will throw off the ratio.
Butter keeps the foam down. Still skim if needed.
Low-sugar variations require low-sugar pectin.
If jam doesn’t set, reprocess within 24 hours by reheating and boiling again.
Frozen berries work well — they just need to be fully thawed before starting.
Jam usually takes about 30 minutes from start to finish.
Use a potholder — the paddle and pot get extremely hot!