When should I plant Purple Kohlrabi in Zone 9b?

Start Purple Kohlrabi seeds indoors around Jan 27. Transplant outdoors after Feb 17. Expect first harvest around Mar 29.

What is the last frost date for Zone 9b?

The average last spring frost date for Zone 9b is Mar 10. The first fall frost averages Nov 15, giving a 250-day growing season.

Can I grow Purple Kohlrabi in Zone 9b?

Yes. Purple Kohlrabi needs 55 days to harvest. Zone 9b has a 250-day growing season, which is sufficient. You can plant up to 9 successions.

Growing Purple Kohlrabi in Zone 9b

Zone 9b has warm winters and an extended growing season — excellent for heat-loving crops like Purple Kohlrabi. Last frost: Mar 10. First frost: Nov 15.

Planting Calendar

Indoor

Outdoor

Harvest

Jan 27Nov 15

Season: Mar 10 – Nov 15 (250 days) · Succession: plant every 3 weeks (up to 9x)

Zone9b

Last FrostMar 10

First FrostNov 15

Season Length250 days

Days to Harvest55

SunFull Sun

Frost ToleranceModerate

Spacing4/sqft (6" apart)

When to Plant Purple Kohlrabi in Zone 9b

Start Seeds Indoors: Jan 27

Start Purple Kohlrabi seeds indoors around Jan 27 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 5–10 days.

Transplant Outdoors: Feb 17

Transplant Purple Kohlrabi seedlings outdoors after Feb 17. Wait until soil temperature reaches 45°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: Mar 29

First harvest approximately Mar 29 (~40 days from transplant). Continue harvesting until first frost (Nov 15).

Fall Planting: Sep 20

For a fall harvest, plant Purple Kohlrabi around Sep 20 (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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