Growing Purple Kohlrabi in Zone 6a
Zone 6a has mild winters and a long growing season — good conditions for Purple Kohlrabi. Last frost: Apr 28. First frost: Oct 8.
Planting Calendar
Season: Apr 28 – Oct 8 (163 days) · Succession: plant every 3 weeks (up to 5x)
When to Plant Purple Kohlrabi in Zone 6a
Start Seeds Indoors: Mar 17
Start Purple Kohlrabi seeds indoors around Mar 17 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 5–10 days.
Transplant Outdoors: Apr 7
Transplant Purple Kohlrabi seedlings outdoors after Apr 7. 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 17
First harvest approximately May 17 (~40 days from transplant). Continue harvesting until first frost (Oct 8).
Fall Planting: Aug 13
For a fall harvest, plant Purple Kohlrabi around Aug 13 (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 13bFrequently Asked Questions
When should I plant Purple Kohlrabi in Zone 6a?
Start Purple Kohlrabi seeds indoors around Mar 17. Transplant outdoors after Apr 7. Expect first harvest around May 17.
What is the last frost date for Zone 6a?
The average last spring frost date for Zone 6a is Apr 28. The first fall frost averages Oct 8, giving a 163-day growing season.
Can I grow Purple Kohlrabi in Zone 6a?
Yes. Purple Kohlrabi needs 55 days to harvest. Zone 6a has a 163-day growing season, which is sufficient. You can plant up to 5 successions.
What is the best month to plant Purple Kohlrabi in Zone 6a?
The best time to start Purple Kohlrabi in Zone 6a is Mar. Begin seeds indoors around Mar 17, then transplant outdoors after the last frost date of Apr 28.
How long does Purple Kohlrabi take to harvest?
Purple Kohlrabi takes approximately 55 days from planting to harvest. In Zone 6a, expect your first harvest around May 17.
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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