When is the last frost in Westmorland, CA?

For ZIP code 92281, the average last spring frost (32°F) is January 4, based on NOAA 1991-2020 climate normals for the Imperial, CA weather station. There is a 1-in-10 chance of a frost after February 7.

When is the first frost in Westmorland, CA?

The average first fall frost (32°F) is December 26. There is a 1-in-10 chance of frost by December 6, so tender plants are at risk from that point on.

How long is the growing season in 92281?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 360 days long.

Are these frost dates a forecast?

No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.

Frost dates for 92281Westmorland, CA

The average last spring frost in Westmorland is January 4 and the average first fall frost is December 26, giving a typical growing season of about 360 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 4
Average first fall frost: Dec 26
Growing season: 360 days

Frost risk by date

NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
Temperature	Last spring: 90% / 50% / 10% chance	First fall: 10% / 50% / 90% chance	Growing season (50%)	Years with at least one
Light frost (36°F)	Dec 28 · Jan 24 · Feb 21	Nov 27 · Dec 14 · Jan 1	326 days	96%
Frost / freeze (32°F)	Dec 13 · Jan 4 · Feb 7	Dec 6 · Dec 26 · Jan 25	360 days	61%
Hard freeze (28°F)	Dec 14 · Jan 4 · Feb 6	Dec 13 · Jan 1 · Feb 6	365 days	12%

Where these dates come from

ZIP code 92281 is matched to the NOAA station Imperial, CA, 21.2 km away, at -64 ft elevation (87 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Imperial, CA (used)	-64 ft	Jan 4	Dec 26
Brawley 2 Sw, CA	-100 ft	Jan 16	Dec 19
Imperial Co Ap, CA	-58 ft	Jan 14	Dec 24
El Centro Naf, CA	-42 ft	Jan 6	Dec 21

Frost dates near Westmorland

Brawley, CA 92227 · last Jan 4, first Dec 26
Calipatria, CA 92233 · last Jan 4, first Dec 26
Imperial, CA 92251 · last Jan 4, first Dec 26
El Centro, CA 92243 · last Jan 3, first Dec 27
Seeley, CA 92273 · last Jan 6, first Dec 21
Holtville, CA 92250 · last Jan 3, first Dec 27
Heber, CA 92249 · last Jan 3, first Dec 27
Niland, CA 92257 · last Jan 6, first Dec 22

Frequently asked questions

When is the last frost in Westmorland, CA?: For ZIP code 92281, the average last spring frost (32°F) is January 4, based on NOAA 1991-2020 climate normals for the Imperial, CA weather station. There is a 1-in-10 chance of a frost after February 7.
When is the first frost in Westmorland, CA?: The average first fall frost (32°F) is December 26. There is a 1-in-10 chance of frost by December 6, so tender plants are at risk from that point on.
How long is the growing season in 92281?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 360 days long.
Are these frost dates a forecast?: No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.