Frost dates for 91793 — West Covina, CA
Frost is light and occasional here — typically a few cold nights around midwinter (about 1 a year). Cover tender plants when frost is forecast.
How West Covina compares
- In a typical year, frost nights in West Covina fall between January 2 and January 4. In 1 year in 10 the first frost comes as early as December 18, or the last frost as late as January 28.
- West Covina shares its weather station with El Monte, CA, 8 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | December 19 |
| 50% (median) | January 4 |
| 10% (safe for tender plants) | January 28 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | December 18 |
| 50% (median) | January 2 |
| 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.
Gardening where frost is rare
West Covina, 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 San Gabriel Fire Dept, CA weather station, 15 km away (elevation 364 ft (111 m)).
ZIP codes in West Covina: 91790 91791 91792 91793
Frost dates near West Covina
- Baldwin Park Jan 4 · Jan 2
- La Puente Jan 4 · Jan 2
- City Of Industry Jan 4 · Jan 2
- Covina Jan 8 · Dec 28
- Azusa Jan 8 · Dec 28
- El Monte Jan 4 · Jan 2
- Hacienda Heights rare frost
- Duarte Apr 28 · Nov 15
Frequently asked questions
When is the last frost in West Covina, CA?
The median last spring frost in West Covina, CA is January 4. There is still about a 10% chance of frost after January 28, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in West Covina, CA?
The median first fall frost is January 2, with about a 10% chance of frost before December 18.
How long is the growing season in West Covina, CA?
About 363 days between the median last spring frost and first fall frost.
What planting zone is West Covina, CA?
West Covina, CA is in USDA hardiness zone 10a.