San Bernardino, CA · zone 9b · ~297 frost-free days
When to plant a garden in San Bernardino.
In San Bernardino, the typical last spring frost lands around Feb 15 and the first fall frost around Dec 9, giving you about 297 frost-free days. Cool-season crops go out before the last frost; warm-season crops wait until after it.
The 2026 windows
Sow dates for San Bernardino, keyed to your frost.
| Crop | Start indoors | Spring sow / set out | Fall sow |
|---|---|---|---|
| Tomato, slicing | Jan 11 to Mar 13 | Feb 22 to Apr 24 | — |
| Lettuce, leaf | — | Jan 8 to Feb 22 | Sep 25 to Nov 24 |
| Carrot | — | Jan 8 to Feb 10 | Sep 13 to Oct 9 |
| Bush Bean | — | Feb 15 to Apr 7 | Aug 25 to Sep 27 |
| Cucumber, slicing | — | Feb 22 to May 24 | Aug 8 to Sep 8 |
| Pepper, bell | Jan 20 to Mar 13 | Mar 3 to Apr 24 | — |
| Kale | Nov 27 to Dec 25 | Jan 8 to Feb 5 | Sep 8 to Oct 24 |
| Spinach | — | Jan 1 to Feb 5 | Sep 25 to Nov 13 |
San Bernardino sits in Zone 9b, but two gardens in the same city can be a week or two apart. The planner works from your ZIP code's frost dates, not the zone, so the dates land right for your block, not the metro average.
Build your San Bernardino garden plan.
Tell the free planner what you want to eat and who you're feeding. It returns plant counts, spacing, and frost-safe sow dates for ZIP 92401 in about 60 seconds.