When to plant winter squash in South Carolina
South Carolina’s average last spring frost is March 25, and the first fall frost typically arrives around November 5 — about 225 frost-free days (USDA zones 7a, 7b, 8a, 8b, 9a). Winter Squash needs 80–110 days to mature, which fits comfortably within South Carolina's growing season.
When to plant winter squash in South Carolina: the short answer
For a spring planting, plant out Mar 25 – Apr 11, with seeds started indoors Feb 25 – Mar 11. Wait until the soil is at least 60°F and frost is over.
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.
How to grow winter squash in South Carolina, step by step
- Start seeds indoors (Feb 25 – Mar 11). Sow seeds 1 inch deep in seed-starting mix under bright light. They take 5-10 days to sprout, fastest in soil around 85°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. It needs at least six to eight hours of direct sun a day and loose soil at least 18 inches deep, with a pH between 5.5 and 7.0. Dig in compost before planting.
- Plant out (Mar 25 – Apr 11). Space plants about 42 inches apart in rows 72 inches apart. It is killed by frost, so nothing goes outside until the danger has passed.
- Water and feed. Give it steady, even moisture, about an inch of water a week from rain or the hose.
- Watch for pests and problems. Pests: squash vine borer, squash bug, striped cucumber beetle. Diseases and disorders: powdery mildew, bacterial wilt.
- Harvest (from about Jun 20 – Jul 20). Winter Squash takes 80-110 days to reach harvest. Needs the whole season - direct sow only where you have 100+ frost-free days. Cure 10 days in warmth after harvest for storage.
Figures come from our crop data; dates use South Carolina’s average frost dates. More in the full winter squash growing guide.
Winter Squash planting dates by USDA zone in South Carolina
South Carolina spans USDA zones 7a, 7b, 8a, 8b, 9a. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average, so the winter squash dates shift with them.
When to plant winter squash in nearby states
| State | Last frost | Plant out |
|---|---|---|
| South Carolina (this page) | March 25 | Mar 25 – Apr 11 |
| North Carolina | April 5 | Apr 5 – Apr 22 |
| Georgia | March 25 | Mar 25 – Apr 11 |
| Tennessee | April 10 | Apr 10 – Apr 27 |
| Kentucky | April 18 | Apr 18 – May 5 |
Questions gardeners in South Carolina ask
When is the best time to plant winter squash in South Carolina?
Plant winter squash transplants outdoors in South Carolina between March 25 and April 11. That timing is set by South Carolina's average last spring frost of March 25.
When should I start winter squash seeds indoors in South Carolina?
Start seeds indoors between February 25 and March 11, about 3 weeks before the last frost, so the seedlings are ready to plant out from March 25.
What is the latest I can plant winter squash in South Carolina?
About August 17. Winter squash needs at least 80 days to mature, and frost around November 5 ends the season, so later plantings risk being cut short.
When will winter squash planted in South Carolina be ready to harvest?
Planted on time, winter squash is usually ready from about June 20 to July 20, 80-110 days after planting.
When is the last frost in South Carolina?
On average around March 25, with the first fall frost around November 5 - about 225 frost-free days. Your town may differ by two weeks or more.