When should I plant Purple Kohlrabi in Zone 6b?

Start Purple Kohlrabi seeds indoors around Mar 4. Transplant outdoors after Mar 25. Expect first harvest around May 4.

What is the last frost date for Zone 6b?

The average last spring frost date for Zone 6b is Apr 15. The first fall frost averages Oct 22, giving a 190-day growing season.

Can I grow Purple Kohlrabi in Zone 6b?

Yes. Purple Kohlrabi needs 55 days to harvest. Zone 6b has a 190-day growing season, which is sufficient. You can plant up to 6 successions.

Growing Purple Kohlrabi in Zone 6b

Zone 6b has mild winters and a long growing season — good conditions for Purple Kohlrabi. Last frost: Apr 15. First frost: Oct 22.

Planting Calendar

Indoor

Outdoor

Harvest

Mar 4Oct 22

Season: Apr 15 – Oct 22 (190 days) · Succession: plant every 3 weeks (up to 6x)

Zone6b

Last FrostApr 15

First FrostOct 22

Season Length190 days

Days to Harvest55

SunFull Sun

Frost ToleranceModerate

Spacing4/sqft (6" apart)

When to Plant Purple Kohlrabi in Zone 6b

Start Seeds Indoors: Mar 4

Start Purple Kohlrabi seeds indoors around Mar 4 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 5–10 days.

Transplant Outdoors: Mar 25

Transplant Purple Kohlrabi seedlings outdoors after Mar 25. Wait until soil temperature reaches 45°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: May 4

First harvest approximately May 4 (~40 days from transplant). Continue harvesting until first frost (Oct 22).

Fall Planting: Aug 27

For a fall harvest, plant Purple Kohlrabi around Aug 27 (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 Purple Kohlrabi Garden

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

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