Low-Sugar No-Cook Blackberry Freezer Jam (No Pectin)

This is the best blackberry freezer jam you’ll ever try — made without pectin, with very little sugar, no cooking, and loaded with fresh blackberry flavor. It’s simple to make and preserves the bright taste of ripe berries.

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Why You’ll Love This Easy Blackberry Freezer Jam

Get ready for a freezer jam that tastes like summer in a jar. This blackberry freezer jam is made without pectin, uses minimal sugar, requires no cooking, and highlights the fresh flavor of the berries. It takes only about 10 minutes to prepare and keeps up to a year in the freezer.

If you have a bounty of berries from the garden or buy them in season, this no-cook method is a quick, reliable way to preserve their flavor. Unlike traditional cooked jams that often rely heavily on sugar, freezer jam is mostly fruit with just enough sweetener and a modern thickener to set it.

Like classic freezer jam recipes, this version works well with both fresh and fully thawed frozen blackberries. The texture is yours to control — blend smooth or leave it slightly chunky by mashing.

Freezer jam is prized because it preserves the bright, ripe taste of berries without subjecting them to heat. It’s fantastic on toast, biscuits, pancakes, waffles, yogurt, ice cream, or slathered on homemade bread. This recipe keeps the jam fruit-forward and less sweet than many traditional jars you’ll find at the store.

How to Make No-Cook Blackberry Freezer Jam

This recipe uses just four main ingredients and takes minutes to put together. Combine fresh (or thawed) blackberries with lemon juice, a small amount of sugar (or sugar substitute), and a no-cook thickener. Blend or mash to the texture you prefer, taste and adjust sweetness, then let the mixture rest a few minutes to thicken.

Once it reaches the consistency you like, spoon the jam into clean, freezer-safe jars, leaving about an inch of headspace to allow for expansion. The jam can be enjoyed right away or stored in the freezer for later; properly stored it will keep for up to one year.

Key Ingredients & Essential Tools

Ingredients:

• 4 cups blackberries: Fresh or frozen (fully thawed).
• 1/4 cup lemon juice: Fresh or concentrate to brighten flavor and help preserve color.
• 1/3 cup Ultra Gel or EZ Gel thickener: A no-cook modified starch that sets jam without boiling.
• 1/4 cup granulated sugar: Or use a sugar substitute like erythritol; adjust to taste.

Tools:

• Blender, food processor, or potato masher: For your desired texture.
• Measuring cups for accuracy.
• Large mixing bowl to combine ingredients.
• Freezer-safe jars: Glass jars designed for freezing are best; leave headspace for expansion.
• Reusable freezer lids (optional): An eco-friendly option for storage.

Sugar-Free Blackberry Freezer Jam? Yes, You Can!

You can make a lower-sugar or sugar-free version by substituting erythritol for granulated sugar. Erythritol is a sugar alcohol with fewer calories than sugar and works well in jams for those limiting sugar. Taste and adjust the amount based on your preference.

You May Also Enjoy These Other Freezer Jam Recipes!

If you like this blackberry jam, try other freezer jam varieties or pair it with homemade breads and breakfast favorites. Popular combinations include sugar-free strawberry freezer jam, raspberry freezer jam, and freshly baked bread — all great ways to enjoy preserved summer fruit.

Please review the recipe if you try it!

If you make this jam, please leave a review and share how it turned out. I love seeing photos of your creations — tag me on Instagram with your results!