Frost dates for 92508 — Riverside, CA
Last spring frostRaremost years have none
First fall frostRaremost years have none
Hardiness zone9bZone 9b
Gardening where frost is rare
Riverside, CA rarely or never drops to freezing, 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 March Afb, CA weather station, 5 km away (elevation 1,516 ft (462 m)).
ZIP codes in Riverside: 92501 92502 92503 92504 92505 92506 92507 92508 92509 92513 92514 92515 92516 92517 92519 92521 92522
Frost dates near Riverside
- Moreno Valley rare frost
- March Air Reserve Base Jan 9 · Dec 25
- Perris rare frost
- Grand Terrace Jan 10 · Jan 2
- Colton Jan 27 · Dec 19
- Loma Linda Jan 27 · Dec 19
- Bryn Mawr Jan 27 · Dec 19
- Nuevo Jan 31 · Dec 10
Frequently asked questions
When is the last frost in Riverside, CA?
In most years Riverside, CA has no frost at all. The nearest NOAA station averages 25 nights a year at or below 32°F — too few to calculate a typical frost date.