Swiss Chard in Zone 10a & 10b
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When to plant swiss chard in zone 10b
Zones 10a and 10b share the same average frost dates in our data, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. In your zone, Swiss Chard needs a head start on the heat that direct-sowing elsewhere doesn't require.
| Window | Fall window |
|---|---|
| Start indoors | Aug–Jan |
| Direct sow / transplant outside | Sep–Feb |
| Estimated harvest | Oct 26–Apr 24 '27 (~55 days after transplanting) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Zone 10b dates sourced from growinginthegarden.com.
Swiss chard does what spinach and lettuce can't: keep producing through the heat of summer without bolting. It can be started indoors or direct-seeded, and a single planting will often keep giving cut-and-come-again harvests for months.
How swiss chard fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Swiss Chard needs about 55 days from sowing to first harvest.
Good companions
- Bush Beans: Beans fix nitrogen chard uses heavily.
Where to buy swiss chard seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing swiss chard" 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 Swiss Chard in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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