Frost dates for 91950 — National City, CA
Last spring frostRaremost years have none
First fall frostRaremost years have none
Hardiness zone10bZone 10b
Gardening where frost is rare
National City, 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.
How National City compares
- National City shares its weather station with Chula Vista, CA, 7 km away, so the two have the same frost dates.
About these dates
Based on 1991–2020 NOAA climate normals for the Chula Vista, CA weather station, 4 km away (elevation 56 ft (17 m)).
ZIP codes in National City: 91950 91951
Frost dates near National City
- Bonita rare frost
- Chula Vista rare frost
- Coronado rare frost
- Lemon Grove Jan 6 · Dec 21
- San Diego rare frost
- Imperial Beach rare frost
- Spring Valley Jan 6 · Dec 21
- La Mesa Jan 6 · Dec 21
Frequently asked questions
When is the last frost in National City, CA?
In most years National City, 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.