When should I plant Swiss Chard in Zone 4b?

Start Swiss Chard seeds indoors around Apr 3. Transplant outdoors after Apr 17. Expect first harvest around May 27.

What is the last frost date for Zone 4b?

The average last spring frost date for Zone 4b is May 1. The first fall frost averages Oct 5, giving a 157-day growing season.

Can I grow Swiss Chard in Zone 4b?

Yes. Swiss Chard needs 55 days to harvest. Zone 4b has a 157-day growing season, which is sufficient.

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🥬 Growing Swiss Chard in Zone 4b

Zone 4b has cold winters and a moderate growing season. Timing is key for Swiss Chard in this zone. Last frost: May 1. First frost: Oct 5.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 3Oct 5

Season: May 1 – Oct 5 (157 days)

Zone4b

Last FrostMay 1

First FrostOct 5

Season Length157 days

Days to Harvest55

SunPart Sun / Part Shade

Frost ToleranceLight

Spacing4/sqft (6" apart)

When to Plant Swiss Chard in Zone 4b

Start Seeds Indoors: Apr 3

Start Swiss Chard seeds indoors around Apr 3 (4 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 7–14 days.

Transplant Outdoors: Apr 17

Transplant Swiss Chard seedlings outdoors after Apr 17. Wait until soil temperature reaches 50°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: May 27

First harvest approximately May 27 (~40 days from transplant). Continue harvesting until first frost (Oct 5).

Fall Planting: Aug 10

For a fall harvest, plant Swiss Chard around Aug 10 (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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