DibbleWhen to plant Swiss chard in Zone 9
In Zone 9, the last spring frost usually passes around March 1 and the first fall frost arrives around December 1, leaving about 275 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Very long season. Plant cool crops in fall and winter; manage summer heat.
Planting windows for Swiss chard in Zone 9
| Task | Window |
|---|---|
| Direct sow | Feb 15 to Mar 1 |
| Estimated harvest | Apr 11 to Aug 9 |
The harvest estimate counts 55 days to maturity, then a picking window of about 120 days. These windows use typical frost dates for Zone 9; Dibble pins them to your exact ZIP code.
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Swiss Chard in a Zone 9 season
Zone 9 gives about 275 frost-free days. Swiss Chard needs roughly 55 days from sowing. That leaves about 220 days of slack, so there is room for a late start or a second planting.
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 other zones
Not in Zone 9? Pick your zone for the same dated windows.
Keep exploring
Swiss Chard: the full growing guide · The Zone 9 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.