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← How to grow swiss chard
Planting Calendar · Zone 3A

When to plant swiss chard in zone 3a

In USDA zone 3a, start swiss chard seeds indoors around May 2, transplant outdoors May 16, and harvest from Jul 5.

We don’t publish a planting calendar for zone 3a, because every date on one would be counted from a last-frost date this zone doesn’t reliably have. Swiss Chard takes about 50–60 days from sowing to first picking, and that part holds anywhere. For real dates, tell us where you are below and Garzed reads ten years of weather at your own coordinates.

Why these dates work in zone 3a

Zone 3a's last spring frost averages May 30 and first fall frost Sep 10 — about 103 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 Jul 2 for a second harvest before frost. One caveat: we haven't yet checked zone 3a against the weather archive, so those frost dates are an inherited estimate rather than a measurement. Give Garzed your location and it works from that location's own ten-year record instead.

Common questions

How long does swiss chard take to grow in zone 3a?

Swiss Chard matures in about 50–60 days from sowing. In zone 3a that means sowing around May 16 and first picking around Jul 5.

Will swiss chard survive frost in zone 3a?

Yes — swiss chard tolerates light frost. In zone 3a you can sow a little before the last frost (around May 30) and keep harvesting past the first fall frost (around Sep 10).

Can I plant a second crop of swiss chard in zone 3a?

Yes — in zone 3a there's time for a fall sowing around Jul 2 for a second harvest before frost.

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