When to plant zucchini / summer squash in North Carolina
North Carolina’s average last spring frost is April 5, and the first fall frost typically arrives around October 25 — about 203 frost-free days (USDA zones 5b, 6a, 6b, 7a, 7b, 8a, 8b). Zucchini / Summer Squash needs 45–60 days to mature, which fits comfortably within North Carolina's growing season.
North Carolina covers a wide range of climates, so your exact frost dates may differ from the state average by two weeks or more. For dates tuned to your town, use the calendar generator.
When to plant zucchini / summer squash in North Carolina: the short answer
For a spring planting, plant out Apr 5 – Apr 22, with seeds started indoors Mar 8 – Mar 22. Wait until the soil is at least 60°F and frost is over.
Succession sow again in North Carolina: May 10 · Jun 7 · Jul 5 · Aug 2
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 zucchini / summer squash in North Carolina, step by step
- Start seeds indoors (Mar 8 – Mar 22). 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 14 inches deep, with a pH between 5.5 and 7.5. Dig in compost before planting.
- Plant out (Apr 5 – Apr 22). Space plants about 30 inches apart in rows 42 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, aphids. Diseases and disorders: powdery mildew, bacterial wilt, blossom-end rot (calcium disorder).
- Harvest (from about May 27 – Jun 11). Zucchini / Summer Squash takes 45-60 days to reach harvest. One or two plants feed a household. A second sowing in early-mid summer dodges the first vine borer generation.
Figures come from our crop data; dates use North Carolina’s average frost dates. More in the full zucchini / summer squash growing guide.
Zucchini planting dates by USDA zone in North Carolina
North Carolina spans USDA zones 5b, 6a, 6b, 7a, 7b, 8a, 8b. 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 zucchini / summer squash dates shift with them.
When to plant zucchini / summer squash in nearby states
| State | Last frost | Plant out |
|---|---|---|
| North Carolina (this page) | April 5 | Apr 5 – Apr 22 |
| South Carolina | March 25 | Mar 25 – Apr 11 |
| Georgia | March 25 | Mar 25 – Apr 11 |
| Tennessee | April 10 | Apr 10 – Apr 27 |
| Kentucky | April 18 | Apr 18 – May 5 |
Questions gardeners in North Carolina ask
When is the best time to plant zucchini / summer squash in North Carolina?
Plant zucchini / summer squash transplants outdoors in North Carolina between April 5 and April 22. That timing is set by North Carolina's average last spring frost of April 5; North Carolina spans several climates, so cooler and higher parts of the state run later.
When should I start zucchini / summer squash seeds indoors in North Carolina?
Start seeds indoors between March 8 and March 22, about 3 weeks before the last frost, so the seedlings are ready to plant out from April 5.
Can I plant zucchini / summer squash in the fall in North Carolina?
Yes. For a fall crop, sow between July 23 and August 9, so the crop matures in cool weather before North Carolina's first frost around October 25.
When will zucchini / summer squash planted in North Carolina be ready to harvest?
Planted on time, zucchini / summer squash is usually ready from about May 27 to June 11, 45-60 days after planting.
When is the last frost in North Carolina?
On average around April 5, with the first fall frost around October 25 - about 203 frost-free days. Your town may differ by two weeks or more.