How to Freeze Kohlrabi

Yes, you can freeze kohlrabi — and it freezes well, with one important caveat. The crisp, snappy texture you get from fresh kohlrabi doesn’t survive freezing. Ice crystals form inside the cell walls during the freeze, and those walls break. When thawed, the kohlrabi is softer and a bit watery.

This doesn’t mean frozen kohlrabi is bad. It means you need to plan for how you’ll use it. In soups, stews, gratins, purees, and stir-fries, the texture difference barely registers. In a raw salad or slaw, it would be obvious and unpleasant.

Freeze kohlrabi when you have more than you can eat fresh. It beats letting it go soft and spongy in the back of the crisper drawer.

What You’ll Need

• Fresh kohlrabi (any amount)
• A sharp vegetable peeler or knife
• A large pot of boiling water
• A large bowl of ice water
• Clean kitchen towels or paper towels
• A baking sheet lined with parchment paper
• Freezer bags or airtight freezer containers
• A marker for labeling

Step-by-Step: Freezing Kohlrabi

Step 1: Choose Good Bulbs

Start with firm, fresh kohlrabi. Bulbs that are already getting soft or spongy won’t improve in the freezer — they’ll just get worse. Pick bulbs that feel heavy for their size with smooth, unblemished skin.

Smaller bulbs (under 3 inches diameter) tend to have better flavor and less woodiness. If you’re working with large bulbs, cut a test slice and taste it. Woody or fibrous kohlrabi isn’t worth the effort of freezing.

Step 2: Peel Thoroughly

Remove the leaves first — store those separately if they’re fresh, or compost them.

Peel the bulb, removing both the outer skin and the fibrous layer beneath it. You should see smooth, uniformly pale flesh. This fibrous layer is even more noticeable after freezing, so don’t be stingy with the peeler.

Step 3: Cut into Uniform Pieces

Cut the peeled kohlrabi into pieces based on how you plan to use it later:

• 1/2-inch cubes — the most versatile option. Good for soups, stews, roasting from frozen, stir-fries.
• 1/4-inch slices or half-moons — good for gratins or quick sautés.
• Shredded — if you plan to use it in fritters or hash. Blanch time is shorter for shredded kohlrabi (see below).

Keeping pieces uniform ensures even blanching and even freezing. Mixed sizes mean some pieces are overblanched while others aren’t blanched enough.

Step 4: Blanch

This is the most important step. Blanching — briefly cooking in boiling water — deactivates enzymes that cause flavor degradation, color loss, and texture breakdown during freezer storage. Unblanched kohlrabi loses flavor within a month or two. Blanched kohlrabi holds its quality for up to a year.

For cubes and slices: Blanch for 2 minutes in rapidly boiling water. Start timing from when the kohlrabi goes into the pot, not from when the water returns to a boil.

For shredded kohlrabi: Blanch for 1 minute. It’s thinner, so it needs less time.

Work in batches if you have a lot. Don’t overload the pot — the water temperature drops too much and you end up with unevenly blanched kohlrabi.

Step 5: Ice Bath

The moment the blanching time is up, use a slotted spoon or spider strainer to transfer the kohlrabi directly into a large bowl of ice water. This stops the cooking immediately.

Leave it in the ice bath for the same amount of time you blanched it — 2 minutes for cubes, 1 minute for shreds. You want the pieces cold all the way through.

If you’re processing a lot of kohlrabi, refresh the ice bath between batches. Warm ice water doesn’t do its job.

Step 6: Drain and Dry

Drain the kohlrabi thoroughly in a colander. Then spread the pieces on a clean kitchen towel or layer of paper towels and pat dry. Blot the tops too.

Excess water is the enemy here. Water on the surface turns into ice crystals that cause freezer burn and clumping. The drier you get the pieces now, the better the end result.

Step 7: Flash Freeze

Spread the dried pieces in a single layer on a parchment-lined baking sheet. Make sure no pieces are touching or overlapping.

Place the sheet in the freezer for 1-2 hours, until the pieces are frozen solid.

This step prevents the kohlrabi from freezing into one giant clump in the bag. After flash freezing, each piece is individually frozen, so you can pour out exactly as much as you need later.

Step 8: Bag and Label

Transfer the frozen pieces into freezer bags. Squeeze out as much air as possible before sealing — air causes freezer burn. If you have a vacuum sealer, even better.

Label each bag with the contents and the date. You’ll thank yourself in January when you’re staring at a freezer full of mystery bags.

Portion tip: Freeze in amounts you’ll actually use at once. Two-cup portions work well for soups and side dishes. Pulling out one big bag and trying to chisel off a portion is annoying.

How Long Does Frozen Kohlrabi Last?

At 0°F (-18°C) or below:

• Best quality: 8-10 months
• Still good: up to 12 months
• Safe but declining: beyond 12 months (won’t make you sick, but flavor and texture degrade)

The blanching is what buys you that long window. Unblanched kohlrabi starts losing flavor noticeably after 6-8 weeks.

Using Frozen Kohlrabi

Here’s the good news: for most cooked applications, you don’t need to thaw it first. Toss frozen kohlrabi cubes directly into the pot, pan, or oven.

Works Great From Frozen

• Soups and stews. Try our kohlrabi soup recipe — add frozen cubes 15-20 minutes before the soup is done. They’ll cook through and soften to the right consistency.
• Purees and mashed kohlrabi. Boil frozen kohlrabi until tender, then blend. The texture change from freezing actually helps here — it breaks down faster and purees smoother.
• Roasted kohlrabi. Toss frozen cubes with oil and roast at 425°F. They’ll take 5-10 minutes longer than fresh. The edges still caramelize well.
• Stir-fries. Add frozen pieces to a hot pan. The initial water release will create steam, so let it cook off before expecting any browning.
• Gratins and casseroles. Layer frozen slices or cubes into the dish. Account for a little extra liquid in the recipe.

Doesn’t Work After Freezing

• Raw eating. Thawed kohlrabi is limp and waterlogged. No amount of wishful thinking will give it that fresh snap back.
• Slaws and salads. Same problem. The texture is wrong for anything where crispness matters.
• Crudité platters. Not happening.

This isn’t a shortcoming — it’s just what happens when you freeze any high-moisture vegetable. Kohlrabi is no different from zucchini or bell peppers in this regard.

Common Mistakes to Avoid

Skipping the blanch. Tempting when you’re in a rush. Don’t. The 2 minutes of blanching buys you months of quality. Unblanched kohlrabi develops off-flavors and turns an unappetizing grayish color over time.

Not drying thoroughly. Wet pieces freeze into a solid, icy block. They also develop more freezer burn. Take the extra few minutes to pat things dry.

Freezing old kohlrabi. The freezer preserves quality — it doesn’t improve it. If the kohlrabi was already getting soft or woody before freezing, it’ll be worse after. Freeze it at peak freshness.

Overpacking bags. Leave a little room in each bag for the contents to expand slightly as they freeze. And flatten the bags before freezing — flat bags stack neatly and thaw faster than round, lumpy ones.

Forgetting to label. Frozen kohlrabi cubes look a lot like frozen turnip cubes, frozen potato cubes, and frozen jicama cubes. Label everything.

Is It Worth Freezing Kohlrabi?

If you grow your own kohlrabi or get it through a CSA, absolutely. A fall harvest can give you more kohlrabi than you’ll eat in three weeks, and freezing it means you’re not wasting produce you put effort into growing.

If you’re buying it from the grocery store in small quantities, probably not. Buy what you’ll use within 2-3 weeks and store it in the fridge instead.

The sweet spot is when you have a surplus. Spend thirty minutes blanching and bagging, and you’ve got kohlrabi ready to throw into soups all winter. That’s a good trade.