Kohlrabi in Zone 10a & 10b
Brassica oleracea (Gongylodes group)
When to plant kohlrabi in zone 10b
Zones 10a and 10b share the same average frost dates in our data, so this page covers both.
Method: Either: Start indoors for an earlier harvest, or direct-sow outside for less fuss. Kohlrabi tolerates either.
| Start indoors | Dec 26–Jan 2 '27 |
|---|---|
| Direct sow / transplant outside | Jan 16–Jan 23 |
| Estimated harvest | Mar 12–Mar 19 (~55 days after planting) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 1-1.5 ft.
Kohlrabi looks like nothing else in the garden: a pale green or purple bulb that swells right at the soil line, with leaves shooting out of it like a small alien plant. It's mild, crisp, and closer to a cross between broccoli stem and jicama than anything most people expect from a brassica.
How kohlrabi fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Kohlrabi needs about 55 days from sowing to first harvest.
Good companions
- Beet: Compatible nutrient needs; common bed-sharing pair.
Where to buy kohlrabi seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing kohlrabi" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 10b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Kohlrabi in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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