When to Plant Swiss Chard: Spring and Fall Dates by Frost

Chard is a beet grown for its leaves, and it's one of the most forgiving crops to time. University of Maryland Extension calls it semi-hardy: it handles light frosts but not heavy ones. UW–Madison notes it tolerates heat better than spinach and rarely bolts, and University of Minnesota Extension says it isn't sensitive to day length the way spinach is. One planting can feed you from late spring until frost. The main timing mistakes are planting so early that a long cold spell sets it up to bolt, and starting the fall crop too late.

Spring dates by last frost

The table counts from your average last spring frost. Utah State says chard can be seeded three to four weeks before the last frost-free date and transplants set out near it; transplants take five to six weeks to grow, and University of Maryland Extension gives the same five-to-six-week lead time for starting seeds indoors.

Soil is a better guide than the calendar. Utah State says chard germinates best at soil temperatures of 55 to 75°F, emerging in 7 to 14 days, and that germination falls off above 80°F. Seed sown at the 40°F minimum will come up slowly.

How much cold chard takes, and why too early can backfire

Utah State says young plants are not seriously damaged by temperatures down to 32°F, and Maryland Extension says chard handles light frosts. A hard freeze can still damage tender seedlings, so cover new plantings if one is forecast.

There's a second reason not to rush. Chard is a biennial: it's meant to flower in its second year, after a winter. University of Minnesota Extension warns that a long stretch of cold after planting can trigger bolting in the first year, which is why it suggests planting chard in early to mid-May in Minnesota rather than as early as possible. In cold-spring areas, aim for the later end of the spring window or use transplants that go out near the frost date.

Seeds or transplants?

Both work. Texas A&M lists chard as easily transplanted; Maryland suggests disturbing the roots as little as possible when you do.

One planting or several?

Because chard rarely bolts in summer heat (UW–Madison, UMN), you usually don't need repeat sowings the way you do with lettuce or spinach. UMN says multiple plantings aren't needed: harvest the outer leaves and the plant keeps growing from the center. Illinois says to cut outer leaves about 1½ inches above the ground when they're 8 to 12 inches long, without damaging the central bud. Utah State notes chard grows best at or below about 75°F, so growth slows in the hottest weeks and picks up again as it cools.

Fall chard: dates by first frost

A fall crop is worth it: chard keeps producing until a hard frost (UMD). Utah State suggests early-maturing varieties sown 50 to 75 days before the date you want them mature, with maturity two to three weeks before your first fall frost. The table shows that latest date for 55- and 60-day varieties (allowing two weeks of picking before frost) next to Texas A&M's fall window of 12 to 14 weeks before the first frost. UMN's northern approach is to start fall chard indoors in June and transplant it.

Late-summer sowings can run into hot soil, and germination drops above 80°F (USU). Shade the row, keep it moist, or start seedlings indoors and transplant them.

Texas, Florida and mild-winter areas

In warm regions chard is a cool-season crop that grows through fall, winter and spring. University of Florida IFAS lists chard from September through May in North and Central Florida and September through March in South Florida, with leaves ready in about 40 to 60 days. Texas A&M gives spring planting 2 to 6 weeks before the frost-free date and fall planting 12 to 14 weeks before the first frost. For more cool-season choices in warm areas, see what to plant in winter.

Where chard goes in the garden

Chard is in the same family as beets and spinach, and Maryland notes it tolerates partial shade (about four to six hours of sun), so it fits the edges of a bed or the shade of taller summer crops. See what to plant with chard for companions, when to plant beets for its closest relative and when to plant spinach for another early green.

Frequently asked questions

When should I plant Swiss chard in spring?

Direct seed about 3 to 4 weeks before your last frost, once the soil is about 40°F, or set out transplants near the last frost date (Utah State). UW–Madison gives about a month before the last frost through midsummer; Texas A&M says 2 to 6 weeks before the frost-free date.

Can Swiss chard survive frost?

Light frost, yes. Utah State says young plants are not seriously damaged down to 32°F, and Maryland Extension calls chard semi-hardy: it handles light frosts but not heavy ones.

Can I plant chard in summer?

Yes. UW–Madison says chard can be seeded through midsummer and tolerates heat better than spinach. Germination drops above 80°F soil (USU), so keep a summer sowing moist and shaded.

When should I plant chard for fall?

Time early varieties to mature 2 to 3 weeks before your first fall frost (Utah State), which means sowing roughly 10 weeks before the frost for a 55-day variety. Texas A&M sows 12 to 14 weeks before the first frost.

Why did my chard bolt?

Chard is a biennial, and University of Minnesota Extension says a long cold spell after planting can make it bolt in its first year. Planting a little later in spring, or using transplants set out near the frost date, helps.

How long does chard take to grow?

About 50 to 70 days to full size (UMD) or 45 to 55 days (Texas A&M), but UW–Madison says you can start picking leaves about four weeks after planting.