Frost dates for 92415 — San Bernardino, CA
Frost is light and occasional here — typically a few cold nights around midwinter (about 3 a year). Cover tender plants when frost is forecast.
How San Bernardino compares
- In a typical year, frost nights in San Bernardino fall between December 19 and January 27. In 1 year in 10 the first frost comes as early as December 1, or the last frost as late as February 28.
- Compared with Riverside, CA, 20 km away, the last frost here is 18 days later than there.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | December 21 |
| 50% (median) | January 27 |
| 10% (safe for tender plants) | February 28 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | December 1 |
| 50% (median) | December 19 |
| 90% (late) | January 26 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for San Bernardino, CA
Frost dates for 92415 — San Bernardino, CA — last frost Jan 27, first frost Dec 19, zone 10a. whenisthelastfrost.com
In mild climates, summer heat limits many crops as much as frost does. Use this calendar for spring planting and lean on fall and winter for cool-season crops.
When to plant vegetables in San Bernardino, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Nov 4 – Nov 18 | Dec 30 – Jan 13 | — | — |
| Peppers | Nov 18 – Dec 2 | Feb 10 – Feb 24 | — | — |
| Eggplant | Nov 18 – Dec 2 | Feb 10 – Feb 24 | — | — |
| Tomatoes | Dec 2 – Dec 16 | Feb 3 – Feb 17 | — | — |
| Lettuce | Dec 2 – Dec 16 | Jan 6 – Jan 20 | Dec 30 – Feb 3 | Oct 24 – Nov 21 |
| Kale | Dec 2 – Dec 16 | Dec 30 – Jan 13 | Dec 30 – Jan 13 | Oct 10 – Oct 31 |
| Broccoli | Dec 2 – Dec 16 | Jan 13 – Jan 27 | — | Sep 12 – Oct 3 |
| Cabbage | Dec 2 – Dec 16 | Jan 6 – Jan 20 | — | Sep 12 – Oct 3 |
| Cauliflower | Dec 2 – Dec 16 | Jan 13 – Jan 27 | — | Sep 12 – Oct 3 |
| Okra | Dec 16 – Dec 30 | Feb 17 – Mar 3 | Feb 17 – Mar 3 | — |
| Basil | Dec 16 – Dec 30 | Feb 3 – Feb 17 | — | — |
| Peas | — | — | Dec 16 – Jan 6 | Sep 26 – Oct 17 |
| Spinach | — | — | Dec 16 – Jan 6 | Oct 24 – Nov 14 |
| Radishes | — | — | Dec 23 – Feb 3 | Nov 7 – Nov 28 |
| Cucumbers | Dec 30 – Jan 6 | Feb 10 – Feb 17 | Feb 3 – Feb 17 | Oct 3 – Oct 17 |
| Zucchini & Summer Squash | Dec 30 – Jan 6 | — | Feb 3 – Feb 17 | Oct 10 – Oct 24 |
| Winter Squash & Pumpkins | Dec 30 – Jan 6 | — | Feb 3 – Feb 17 | — |
| Melons & Watermelon | Dec 30 – Jan 6 | Feb 10 – Feb 24 | — | — |
| Carrots | — | — | Jan 6 – Feb 3 | Sep 26 – Oct 10 |
| Beets | — | — | Jan 6 – Feb 3 | Oct 10 – Oct 24 |
| Potatoes | — | — | Jan 6 – Jan 27 | — |
| Swiss Chard | — | — | Jan 13 – Feb 10 | Oct 10 – Oct 24 |
| Cilantro | — | — | Jan 13 – Feb 3 | Oct 24 – Nov 14 |
| Green Beans | — | — | Feb 3 – Feb 24 | Oct 3 – Oct 17 |
| Sweet Corn | — | — | Feb 3 – Feb 17 | — |
| Sweet Potatoes | — | Feb 10 – Mar 3 | — | — |
| Garlic | — | — | — | Dec 5 – Jan 9 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Redlands, CA weather station, 12 km away (elevation 1,411 ft (430 m)).
ZIP codes in San Bernardino: 92401 92402 92403 92404 92405 92406 92407 92408 92410 92411 92413 92415 92418 92423 92427
Frost dates near San Bernardino
- Patton Jan 27 · Dec 19
- Loma Linda Jan 27 · Dec 19
- Highland Jan 27 · Dec 19
- Colton Jan 27 · Dec 19
- Bryn Mawr Jan 27 · Dec 19
- Grand Terrace Jan 10 · Jan 2
- Rialto Jan 10 · Jan 2
- Bloomington Jan 10 · Jan 2
Frequently asked questions
When is the last frost in San Bernardino, CA?
The median last spring frost in San Bernardino, CA is January 27. There is still about a 10% chance of frost after February 28, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in San Bernardino, CA?
The median first fall frost is December 19, with about a 10% chance of frost before December 1.
How long is the growing season in San Bernardino, CA?
About 326 days between the median last spring frost and first fall frost.
What planting zone is San Bernardino, CA?
San Bernardino, CA is in USDA hardiness zone 10a.