When should I plant Swiss Chard in Zone 3b?

Start Swiss Chard seeds indoors around Apr 17. Transplant outdoors after May 1. Expect first harvest around Jun 10.

What is the last frost date for Zone 3b?

The average last spring frost date for Zone 3b is May 15. The first fall frost averages Sep 22, giving a 130-day growing season.

Can I grow Swiss Chard in Zone 3b?

Yes. Swiss Chard needs 55 days to harvest. Zone 3b has a 130-day growing season, which is sufficient.

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🥬 Growing Swiss Chard in Zone 3b

Zone 3b has harsh winters and a short growing season. Start Swiss Chard early indoors to maximize your harvest window. Last frost: May 15. First frost: Sep 22.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 17Sep 22

Season: May 15 – Sep 22 (130 days)

Zone3b

Last FrostMay 15

First FrostSep 22

Season Length130 days

Days to Harvest55

SunPart Sun / Part Shade

Frost ToleranceLight

Spacing4/sqft (6" apart)

When to Plant Swiss Chard in Zone 3b

Start Seeds Indoors: Apr 17

Start Swiss Chard seeds indoors around Apr 17 (4 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 7–14 days.

Transplant Outdoors: May 1

Transplant Swiss Chard seedlings outdoors after May 1. Wait until soil temperature reaches 50°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: Jun 10

First harvest approximately Jun 10 (~40 days from transplant). Continue harvesting until first frost (Sep 22).

Fall Planting: Jul 28

For a fall harvest, plant Swiss Chard around Jul 28 (8 weeks before first frost).

Swiss Chard in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

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