Conditional — Some Areas
Swiss chard (zones 2-11) has limited zone overlap with South Carolina (7a-9a). Only zones 7-9 in the state are suitable.
Your yard isn't the whole zone.
South Carolina spans zones 7a-9a, but your yard has its own microclimate — slope, trees, and low spots shift frost and sun across a single parcel. Enter your address and we'll score swiss chard against your land's actual soil, sun, and frost.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Zone Comparison
Swiss Chard Needs
- USDA Zones: 2-11
- Soil pH: 5.5 - 7.5
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 160+
South Carolina Has
- USDA Zones: 7a-9a
- Last Frost: Mar 1 - Apr 10
- First Frost: Oct 20 - Nov 20
- Annual Rainfall: 45-55 inches
- Common Soils: Red clay (Piedmont), Sandy loam (Coastal), Alluvial
Plant Zone Range (zones 2-11)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Swiss Chard in South Carolina
The frost window
Across South Carolina, the last spring frost clears between Mar 1 and Apr 10, and the first fall frost lands between Oct 20 and Nov 20 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 193-day window you can count on — up to 264 days on a mild site in a kind year.
Frost tenderness
Swiss Chard is frost-tender — its listed minimum temperature is 39.2°F (USDA PLANTS Database) — so set plants out after the last frost has cleared your local site, not the state's earliest date.
Days to maturity vs. the window
At 55 days to maturity (USDA PLANTS Database), a planting right after last frost ripens with 138 days to spare even in South Carolina's tightest frost scenario — room for a later start or a second sowing.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Swiss Chard wants 160+ frost-free days; a typical South Carolina site sees ~220 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Swiss Chard needs ~700 GDD (base 50°F) to ripen. The state median runs ~4200 GDD (USDA NRCS county aggregates), so South Carolina's typical season clears that easily.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Swiss Chard likes near-neutral soil (pH 5.5-7.5). That's the common-ground band across South Carolina's red clay (piedmont) and sandy loam (coastal) — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your South Carolina site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH and drainage requirements from USDA PLANTS Database. South Carolina soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Swiss Chard in South Carolina — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 2-11 (USDA PLANTS Database)
- State Zones: 7a-9a (USDA ARS PHZM 2023)
- Growing Season: Mar 1 - Apr 10 to Oct 20 - Nov 20 (NOAA Climate Normals)
- Days to Maturity: 55 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but South Carolina growers also need to think about:
Red Piedmont clay requires amendment for drainage
Compost opens red clay over time; a raised bed opens it today — both together is the Piedmont standard.
High heat and humidity promote diseases
Wide spacing, morning base-watering, and resistant varieties keep the humid summer honest — extension keeps the lists.
Hurricane risk along the coast
Coastal beds favor wind-tough perennials and well-staked young trees before the storm season.
South Carolina Cooperative Extension
For South Carolina-specific cultivar recommendations, planting calendars, and pest pressure for swiss chard, the canonical source is Clemson Cooperative Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Common Questions About Growing Swiss Chard in South Carolina
When can I plant Swiss Chard in South Carolina?
South Carolina's last spring frost clears between Mar 1 and Apr 10, and the first fall frost lands between Oct 20 and Nov 20 (NOAA Climate Normals 1991-2020). Swiss Chard is frost-tender — its listed minimum temperature is 39.2°F (USDA PLANTS Database) — so wait until the last frost has cleared your specific site before planting out.
Can Swiss Chard mature before first frost in South Carolina?
Yes — Swiss Chard matures in 55 days (USDA PLANTS Database), and South Carolina's dependable frost-free window runs 193 days (NOAA Climate Normals 1991-2020), leaving 138 days of margin. Plant just after last frost and it ripens ahead of the first fall frost.
What hardiness zone is Swiss Chard grown in across South Carolina?
South Carolina spans USDA hardiness zones 7a-9a (USDA ARS PHZM 2023). Swiss Chard carries a range of zones 2-11, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical South Carolina site have?
A typical South Carolina site sees ~220 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Swiss Chard needs 160+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
How should I amend the soil for Swiss Chard in South Carolina?
Swiss Chard prefers pH 5.5-7.5 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across South Carolina soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Swiss Chard actually grow on my specific land in South Carolina?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores swiss chard against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in South Carolina
State-level data is a sketch. Your Growable Ground report scores swiss chard against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds