Strawberry Freezer Jam Recipe

Strawberry freezer jam is an uncooked jam made with 2 cups crushed strawberries, 4 cups sugar, and one 1.75 oz box of fruit pectin boiled with ¾ cup water. It takes about 25 minutes of work, makes about 5 cups (five 8 oz jars), and sets on the counter in 24 hours. No canning, no water bath.

The berries never go on the stove, so the jam tastes like fresh strawberries and stays bright red. Only the pectin cooks. Give it one full minute at a hard boil and the jam sets; cut that short and it stays runny.

One Box of Pectin, Five Jars of Jam

• Ratio: 2 cups crushed strawberries, 4 cups granulated sugar, 1 box (1.75 oz) regular fruit pectin, ¾ cup water
• Berries: about 1½ pounds whole strawberries, fresh or frozen, crushed to 2 cups
• Time: 20 minutes prep, 5 minutes for the pectin and stirring, then 24 hours at room temperature
• Yield: about 5 cups, enough for five 8 oz jars
• Keeps: 3 weeks in the fridge, up to 1 year in the freezer

Freezer Jam vs Cooked Strawberry Jam

Cooked jam is boiled until the fruit and sugar thicken, so it turns darker and tastes jammy and a little caramel. It can be water bath canned and kept in the pantry, like my homemade strawberry jam or the balsamic strawberry jam.

Freezer jam skips all of that. The fruit stays raw, the color stays bright, and the set is softer and more spoonable. The trade is storage: it lives in the fridge or freezer, never on a shelf. If you want a jam with no pectin and far less sugar, chia seed jam is the other quick option.

Crushing and Measuring the Strawberries

Pick berries that are red all the way to the top. White shoulders mean less flavor and a paler jam. Wash, hull, and crush them one layer at a time with a potato masher, or pulse a few times in a food processor. Stop while there are still small pieces. A smooth purée makes a jelly-like jam with no fruit to bite into.

Then measure exactly 2 cups. This is the step people loosen up on, and it matters more than it looks. The pectin in one box can set 2 cups of fruit with 4 cups of sugar. Add an extra half cup of berries and there is not enough pectin to go around, so the jam stays soft. For the same reason, never double the batch. Make two batches one after the other instead.

Making Strawberry Jam From Frozen Strawberries

Yes, frozen strawberries work well here. Use plain, unsweetened berries, not the kind packed in sugar syrup, because that sugar throws off the ratio.

Thaw them completely in a bowl in the fridge or on the counter. Crush them in their juice and measure 2 cups of crushed fruit with the juice included. Do not pour the juice off first: it is part of the fruit, and draining it leaves you with more sugar per cup of strawberry. If the bag gives you more liquid than you need to reach 2 cups, save the extra for a smoothie. Frozen berries come out a touch softer than fresh, but the jam sets the same way.

Boiling the Pectin for One Full Minute

Stir the sugar into the crushed berries first and let the bowl sit for 10 minutes, stirring now and then. The sugar pulls juice out of the fruit and starts to dissolve. You will see it turn syrupy.

Meanwhile, stir the pectin into the ¾ cup water in a small saucepan before you turn on the heat, so the powder does not clump. Set it over medium-high heat and stir constantly. A rolling boil is one that keeps bubbling hard even while you stir. Start a timer only then, boil for exactly 1 minute, and take the pan off the heat.

Why so strict? Powdered pectin only dissolves and activates in boiling water. In cooked jam the long boil does that job. Here the fruit is raw, so this one minute is the only cooking the pectin gets.

Stirring, Jarring, and the 24 Hour Rest

Pour the hot pectin into the strawberries and stir without stopping for 3 minutes. The jam turns glossy and slightly thicker. To check the sugar, rub a drop between your fingers. It should feel almost smooth. A few grains are fine; a sandy feel means keep stirring.

Spoon the jam straight into clean, dry freezer containers or straight-sided jars, leaving ½ inch at the top for expansion. Wipe the rims and put the lids on. Then leave the containers alone on the counter for 24 hours. Moving them around while the pectin sets can break the gel.

How Firm Strawberry Freezer Jam Should Be

After 24 hours it should be a soft set. It mounds on a spoon and holds there, but it spreads more easily than cooked jam. That softness is normal for freezer jam, not a mistake.

If it still looks loose, put one jar in the fridge for a day before you judge it, since cold firms it a little. If it sets too stiff, the fruit was probably measured short of 2 cups. Stir it before spreading and it loosens.

Runny, Grainy, or Foamy Freezer Jam

• Runny: the pectin did not reach a full rolling boil for a whole minute, there was more than 2 cups of fruit, the sugar was cut, or the batch was doubled. A runny batch still makes a good strawberry sauce for pancakes and ice cream.
• Grainy: the sugar did not dissolve. Give the berries and sugar the full 10 minute rest and stir the full 3 minutes after the pectin goes in.
• Foam on top: harmless. Skim it with a spoon before filling the containers if you want a clear top.
• Pale color: the berries were underripe. Fully red berries give the deep red you see in the jars.
• Liquid after thawing: a little separation happens. Stir it back in.

Can You Use Less Sugar in Freezer Jam?

Not with this recipe. Four cups of sugar to two cups of fruit looks like a lot, but regular pectin needs that much sugar to set, and the sugar also keeps the jam fresh in the fridge. Cut it and you get syrup.

If you want a less sweet jam, buy pectin labeled for less or no sugar needed recipes (Sure-Jell sells it in a pink box) and follow the freezer jam directions on its insert. Those amounts are different from the ones on this card.

Swaps That Keep the Set

For a strawberry raspberry jam, use 1 cup crushed raspberries and 1 cup crushed strawberries. The total must still be 2 cups. A teaspoon of vanilla extract stirred into the fruit with the sugar gives it a softer, rounder flavor. For a jam made with several berries and cooked on the stove, the berry medley jam is a better fit.

Keeping Freezer Jam in the Fridge and Freezer

Once the jam has set, keep the jar you are using in the fridge for up to 3 weeks. Freeze the rest for up to 1 year. Write the date on each lid, especially if you make a few batches in a season.

Thaw a frozen container overnight in the fridge, not on the counter, and keep it cold from then on. Freezer jam is not shelf stable, even in a sealed jar, because nothing in it was cooked long enough to preserve it.

Ways to Use a Jar

Spread it on toast, English muffins, or warm sour cream biscuits, or use it in a peanut butter and jelly sandwich. Swirl it into yogurt or oatmeal, or spoon it over vanilla ice cream.

For baking, freezer jam is soft, so use it where it does not need to hold a hard edge. It works in the wells of strawberry thumbprint cookies, spread between the layers of a sheet pan strawberry shortcake cake, or as a thin layer under buttercream. For a thicker filling that stays put in a layer cake, go with this strawberry cake filling.

Quick Questions About Freezer Jam

Do you cook strawberry freezer jam?

Only the pectin and water are cooked, for 1 minute at a rolling boil. The strawberries and sugar are mixed raw.

Why does freezer jam sit out for 24 hours?

The pectin needs a day at room temperature to set. Chilling or freezing it right away can keep it from setting properly.

Can I double this freezer jam recipe?

No. Doubled pectin jams often do not set. Make two separate batches with one box of pectin each.

Can freezer jam be stored in the pantry?

No. It keeps 3 weeks in the fridge and up to a year in the freezer. For pantry jars, make a cooked jam and process it in a water bath.

Pin this strawberry freezer jam so it is ready when strawberries are cheap again, or when there is a bag of frozen berries waiting in the freezer.