When to plant winter squash in California
California’s average last spring frost is February 20, and the first fall frost typically arrives around December 1 — about 284 frost-free days (USDA zones 5a, 6b, 7b, 8b, 9b, 10a, 10b). Winter Squash needs 80–110 days to mature, which fits comfortably within California's growing season.
California 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 winter squash in California: the short answer
For a spring planting, plant out Feb 20 – Mar 9, with seeds started indoors Jan 23 – Feb 6. 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 California, step by step
- Start seeds indoors (Jan 23 – Feb 6). 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 (Feb 20 – Mar 9). 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 May 18 – Jun 17). 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 California’s average frost dates. More in the full winter squash growing guide.
Winter Squash planting dates by USDA zone in California
California spans USDA zones 5a, 6b, 7b, 8b, 9b, 10a, 10b. 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.
| Zone | Last frost | First frost | Season | Start indoors | Plant winter squash |
|---|---|---|---|---|---|
| Zone 5 | Apr 30 | Oct 5 | 160 days | Apr 2 – Apr 16 | Apr 30 – May 17 |
| Zone 6 | Apr 15 | Oct 15 | 185 days | Mar 18 – Apr 1 | Apr 15 – May 2 |
| Zone 7 | Apr 5 | Oct 25 | 200 days | Mar 8 – Mar 22 | Apr 5 – Apr 22 |
| Zone 8 | Mar 20 | Nov 5 | 230 days | Feb 20 – Mar 6 | Mar 20 – Apr 6 |
| Zone 9 | Feb 20 | Nov 30 | 280 days | Jan 23 – Feb 6 | Feb 20 – Mar 9 |
| Zone 10 | Jan 30 | Dec 15 | 330 days | Jan 2 – Jan 16 | Jan 30 – Feb 16 |
Questions gardeners in California ask
When is the best time to plant winter squash in California?
Plant winter squash transplants outdoors in California between February 20 and March 9. That timing is set by California's average last spring frost of February 20; California spans several climates, so cooler and higher parts of the state run later.
When should I start winter squash seeds indoors in California?
Start seeds indoors between January 23 and February 6, about 3 weeks before the last frost, so the seedlings are ready to plant out from February 20.
What is the latest I can plant winter squash in California?
About September 12. Winter squash needs at least 80 days to mature, and frost around December 1 ends the season, so later plantings risk being cut short.
When will winter squash planted in California be ready to harvest?
Planted on time, winter squash is usually ready from about May 18 to June 17, 80-110 days after planting.
When is the last frost in California?
On average around February 20, with the first fall frost around December 1 - about 284 frost-free days. Your town may differ by two weeks or more.