DibbleWhen to plant swiss chard in Zone 10
In Zone 10, the last spring frost usually passes around January 31 and the first fall frost arrives around December 15, leaving about 318 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Nearly frost-free. Grow cool crops in winter; summers are too hot for many vegetables.
Planting windows for swiss chard in Zone 10
| Task | Window |
|---|---|
| Direct sow | Jan 17 to Jan 31 |
| Estimated harvest | Mar 13 to Jul 11 |
The harvest estimate counts 55 days to maturity, then a picking window of about 120 days. These windows use typical frost dates for Zone 10; Dibble pins them to your exact ZIP code.
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How to grow swiss chard
Sow chard a couple of weeks before last frost. Pick outer leaves and it keeps producing from spring through fall.
Companion plants
Good neighbors for Swiss Chard:
Swiss Chard in nearby zones
Keep exploring
Swiss Chard: the full growing guide · The Zone 10 planting calendar · Every crop and zone
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Dates are estimates based on typical frost dates for the zone. Your yard has its own microclimate, so use them as a starting point and adjust as you learn your space.