Chino Hills, CA frost dates
Frost is light and occasional here — typically a few cold nights around midwinter (about 11 a year). Cover tender plants when frost is forecast.
How Chino Hills compares
- In a typical year, frost nights in Chino Hills fall between December 19 and January 17. In 1 year in 10 the first frost comes as early as November 27, or the last frost as late as February 22.
- Chino Hills shares its weather station with Chino, CA, 6 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | December 18 |
| 50% (median) | January 17 |
| 10% (safe for tender plants) | February 22 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 27 |
| 50% (median) | December 19 |
| 90% (late) | January 17 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Gardening where frost is rare
Chino Hills, CA only freezes on a few winter nights, so the usual "plant after the last frost" rule doesn't apply. Heat and rainfall decide the seasons instead:
- Cool-season crops (lettuce, broccoli, peas, carrots) grow best from fall through late winter.
- Warm-season crops (tomatoes, peppers, beans, squash) do best planted in late winter to spring, and again in late summer for a fall crop — midsummer heat can stop tomatoes setting fruit.
- Heat lovers (okra, sweet potatoes, melons) can be planted through spring and early summer.
About these dates
Based on 1991–2020 NOAA climate normals for the Chino Ap, CA weather station, 9 km away (elevation 650 ft (198 m)).
Frost dates near Chino Hills
- Chino Jan 17 · Dec 19
- Diamond Bar Jan 8 · Dec 28
- Pomona Jan 8 · Dec 28
- Yorba Linda rare frost
- Montclair Jan 8 · Dec 28
- Ontario Jan 4 · Dec 30
- Walnut Jan 8 · Dec 28
- Brea rare frost
- Claremont Jan 8 · Dec 28
- Rowland Heights rare frost
Frequently asked questions
When is the last frost in Chino Hills, CA?
The median last spring frost in Chino Hills, CA is January 17. There is still about a 10% chance of frost after February 22, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Chino Hills, CA?
The median first fall frost is December 19, with about a 10% chance of frost before November 27.
How long is the growing season in Chino Hills, CA?
About 336 days between the median last spring frost and first fall frost.
What planting zone is Chino Hills, CA?
Chino Hills, CA is in USDA hardiness zone 10a.