When to plant swiss chard in zone 10b — planting calendar

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Showing USDA Zone 10B

Growing SeasonZone 10b

Last frost ~Jan 15First frost ~Dec 31Today

Start indoorsTransplant / sowHarvestFrost risk

DECJANFEBMARAPRMAYJUN

Start indoors Dec 18 · Sow Jan 1 · First harvest Feb 20 · Wrap by Jun 12

Last spring frostJan 15

Start seeds indoorsDec 18

Direct sowJan 1

First harvestFeb 20

Last harvestJun 12

Fall succession sowOct 22

First fall frostDec 31

Why these dates work in zone 10b

Zone 10b's last spring frost averages Jan 15 and first fall frost Dec 31 — about 350 frost-free days. Swiss Chard tolerates light frost, so you can sow ahead of the last-frost date and keep harvesting into the cooler fall. Starting seeds indoors 4 weeks ahead gives strong transplants ready the moment the soil warms. There's also room for a fall succession sowing around Oct 22 for a second harvest before frost.

Common questions

How long does swiss chard take to grow in zone 10b?

Swiss Chard matures in about 50–60 days from sowing. In zone 10b that means sowing around Jan 1 and first picking around Feb 20.

Will swiss chard survive frost in zone 10b?

Yes — swiss chard tolerates light frost. In zone 10b you can sow a little before the last frost (around Jan 15) and keep harvesting past the first fall frost (around Dec 31).

Can I plant a second crop of swiss chard in zone 10b?

Yes — in zone 10b there's time for a fall sowing around Oct 22 for a second harvest before frost.

For soil, spacing, pests and companion planting, see the full swiss chard growing guide →