Growing Kohlrabi in Zone 1b

Zone 1b has harsh winters and a short growing season. Start Kohlrabi early indoors to maximize your harvest window. Last frost: May 25. First frost: Aug 28.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 13Aug 28

Season: May 25 – Aug 28 (95 days) · Succession: plant every 3 weeks (up to 1x)

Zone1b

Last FrostMay 25

First FrostAug 28

Season Length95 days

Days to Harvest55

SunFull Sun

Frost ToleranceModerate

Spacing6/sqft

When to Plant Kohlrabi in Zone 1b

Start Seeds Indoors: Apr 13

Start Kohlrabi seeds indoors around Apr 13 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 5–10 days.

Transplant Outdoors: May 4

Transplant Kohlrabi seedlings outdoors after May 4. Wait until soil temperature reaches 45°F. Space plants at 6/sqft. Harden off plants for a week before moving outside.

Harvest: Jun 13

First harvest approximately Jun 13 (~40 days from transplant). Continue harvesting until first frost (Aug 28).

Fall Planting: Jul 3

For a fall harvest, plant Kohlrabi around Jul 3 (8 weeks before first frost).

Kohlrabi in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Frequently Asked Questions

When should I plant Kohlrabi in Zone 1b?

Start Kohlrabi seeds indoors around Apr 13. Transplant outdoors after May 4. Expect first harvest around Jun 13.

What is the last frost date for Zone 1b?

The average last spring frost date for Zone 1b is May 25. The first fall frost averages Aug 28, giving a 95-day growing season.

Can I grow Kohlrabi in Zone 1b?

Yes. Kohlrabi needs 55 days to harvest. Zone 1b has a 95-day growing season, which is sufficient. You can plant up to 1 successions.

What is the best month to plant Kohlrabi in Zone 1b?

The best time to start Kohlrabi in Zone 1b is Apr. Begin seeds indoors around Apr 13, then transplant outdoors after the last frost date of May 25.

How long does Kohlrabi take to harvest?

Kohlrabi takes approximately 55 days from planting to harvest. In Zone 1b, expect your first harvest around Jun 13.

Plan Your Kohlrabi Garden

Track Kohlrabi from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

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