When to plant basil 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). Basil needs 30–60 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 basil in California: the short answer
For a spring planting, plant out Feb 27 – Mar 16, with seeds started indoors Jan 9 – Jan 23. Wait until the soil is at least 65°F and frost is over.
Succession sow again in California: Mar 27 · Apr 17 · May 8 · May 29 · Jun 19 · Jul 10 · Jul 31 · Aug 21
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 basil in California, step by step
- Start seeds indoors (Jan 9 – Jan 23). Sow seeds ⅛ inch deep in seed-starting mix under bright light. They take 5-10 days to sprout, fastest in soil around 80°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 10 inches deep, with a pH between 6.0 and 7.0. Dig in compost before planting.
- Plant out (Feb 27 – Mar 16). Space plants about 10 inches apart in rows 12 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: aphids, Japanese beetle, slugs. Diseases and disorders: basil downy mildew, fusarium wilt, damping off.
- Harvest (from about Apr 5 – May 5). Basil takes 30-60 days to reach harvest. Cold soil stalls it - wait for warm nights. Pinch above a leaf pair every couple of weeks and remove flower buds to keep leaves coming. Downy mildew-resistant varieties are worth seeking out.
Figures come from our crop data; dates use California’s average frost dates. More in the full basil growing guide.
Basil 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 basil dates shift with them.
| Zone | Last frost | First frost | Season | Start indoors | Plant basil |
|---|---|---|---|---|---|
| Zone 5 | Apr 30 | Oct 5 | 160 days | Mar 19 – Apr 2 | May 7 – May 24 |
| Zone 6 | Apr 15 | Oct 15 | 185 days | Mar 4 – Mar 18 | Apr 22 – May 9 |
| Zone 7 | Apr 5 | Oct 25 | 200 days | Feb 22 – Mar 8 | Apr 12 – Apr 29 |
| Zone 8 | Mar 20 | Nov 5 | 230 days | Feb 6 – Feb 20 | Mar 27 – Apr 13 |
| Zone 9 | Feb 20 | Nov 30 | 280 days | Jan 9 – Jan 23 | Feb 27 – Mar 16 |
| Zone 10 | Jan 30 | Dec 15 | 330 days | Dec 19 – Jan 2 | Feb 6 – Feb 23 |
Questions gardeners in California ask
When is the best time to plant basil in California?
Plant basil transplants outdoors in California between February 27 and March 16. 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 basil seeds indoors in California?
Start seeds indoors between January 9 and January 23, about 5 weeks before the last frost, so the seedlings are ready to plant out from February 27.
What is the latest I can plant basil in California?
About November 1. Basil needs at least 30 days to mature, and frost around December 1 ends the season, so later plantings risk being cut short.
When will basil planted in California be ready to harvest?
Planted on time, basil is usually ready from about April 5 to May 5, 30-60 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.