DibbleWhen to plant swiss chard in Zone 3
In Zone 3, the last spring frost usually passes around May 15 and the first fall frost arrives around September 15, leaving about 123 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Short, cool season. Start most warm crops indoors and protect from late frosts.
Planting windows for swiss chard in Zone 3
| Task | Window |
|---|---|
| Direct sow | May 1 to May 15 |
| Estimated harvest | Jun 25 to Oct 23 |
The harvest estimate counts 55 days to maturity, then a picking window of about 120 days. These windows use typical frost dates for Zone 3; 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 3 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.