When should I plant Purple Kohlrabi in Zone 3b?

Start Purple Kohlrabi seeds indoors around Apr 3. Transplant outdoors after Apr 24. Expect first harvest around Jun 3.

What is the last frost date for Zone 3b?

The average last spring frost date for Zone 3b is May 15. The first fall frost averages Sep 22, giving a 130-day growing season.

Can I grow Purple Kohlrabi in Zone 3b?

Yes. Purple Kohlrabi needs 55 days to harvest. Zone 3b has a 130-day growing season, which is sufficient. You can plant up to 3 successions.

Growing Purple Kohlrabi in Zone 3b

Zone 3b has harsh winters and a short growing season. Start Purple Kohlrabi early indoors to maximize your harvest window. Sidste frost: May 15. Første frost: Sep 22.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 3Sep 22

Season: May 15 – Sep 22 (130 dage) · Succession: plant every 3 weeks (up to 3x)

Zone3b

Sidste frostMay 15

Første frostSep 22

Sæson130 dage

Høst55 dage

SolFuld Sol

When to Plant Purple Kohlrabi in Zone 3b

Start Seeds Indoors: Apr 3

Start Purple Kohlrabi seeds indoors around Apr 3 (6 uger før sidste frost). Optimal germination temperature: 65F. Germinates in 5-10 days.

Transplant Outdoors: Apr 24

Transplant Purple Kohlrabi seedlings outdoors after Apr 24. Wait until soil temperature reaches 45F. Space plants at 4/m² (15cm afstand). Harden off plants for a week before moving outside.

Harvest: Jun 3

First harvest approximately Jun 3 (~40 dage from transplant). Continue harvesting until first frost (Sep 22).

Fall Planting: Jul 28

For a fall harvest, plant Purple Kohlrabi around Jul 28 (8 weeks before first frost).

Purple 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

Plan Your Garden Purple Kohlrabi

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

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