🥬

🥬 Growing Swiss Chard in Zone 9b

Zone 9b has warm winters and an extended growing season — excellent for heat-loving crops like Swiss Chard. Last frost: Mar 10. First frost: Nov 15.

Planting Calendar

Indoor

Outdoor

Harvest

Feb 10Nov 15

Season: Mar 10 – Nov 15 (250 days)

Zone9b

Last FrostMar 10

First FrostNov 15

Season Length250 days

Days to Harvest55

SunPart Sun / Part Shade

Frost ToleranceLight

Spacing4/sqft (6" apart)

When to Plant Swiss Chard in Zone 9b

Start Seeds Indoors: Feb 10

Start Swiss Chard seeds indoors around Feb 10 (4 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 7–14 days.

Transplant Outdoors: Feb 24

Transplant Swiss Chard seedlings outdoors after Feb 24. Wait until soil temperature reaches 50°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: Apr 5

First harvest approximately Apr 5 (~40 days from transplant). Continue harvesting until first frost (Nov 15).

Fall Planting: Sep 20

For a fall harvest, plant Swiss Chard around Sep 20 (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

Frequently Asked Questions

When should I plant Swiss Chard in Zone 9b?

Start Swiss Chard seeds indoors around Feb 10. Transplant outdoors after Feb 24. Expect first harvest around Apr 5.

What is the last frost date for Zone 9b?

The average last spring frost date for Zone 9b is Mar 10. The first fall frost averages Nov 15, giving a 250-day growing season.

Can I grow Swiss Chard in Zone 9b?

Yes. Swiss Chard needs 55 days to harvest. Zone 9b has a 250-day growing season, which is sufficient.

What is the best month to plant Swiss Chard in Zone 9b?

The best time to start Swiss Chard in Zone 9b is Feb. Begin seeds indoors around Feb 10, then transplant outdoors after the last frost date of Mar 10.

How long does Swiss Chard take to harvest?

Swiss Chard takes approximately 55 days from planting to harvest. In Zone 9b, expect your first harvest around Apr 5.

Plan Your Swiss Chard Garden

Track Swiss Chard from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Swiss Chard Growing Guide