Frost dates for 92628 — Costa Mesa, CA
Last spring frostRaremost years have none
First fall frostRaremost years have none
Hardiness zone10bZone 10b
Gardening where frost is rare
Costa Mesa, 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 Newport Beach Harbor, CA weather station, 5 km away (elevation 10 ft (3 m)).
ZIP codes in Costa Mesa: 92626 92627 92628
Frost dates near Costa Mesa
- Newport Beach rare frost
- Corona Del Mar rare frost
- Fountain Valley rare frost
- Newport Coast rare frost
- Huntington Beach rare frost
- Irvine Jan 5 · Dec 25
- Santa Ana rare frost
- Midway City rare frost
Frequently asked questions
When is the last frost in Costa Mesa, CA?
In most years Costa Mesa, CA has no frost at all. The nearest NOAA station averages 0 nights a year at or below 32°F — too few to calculate a typical frost date.