When is the last frost in Somerton, AZ?

Frost occurs in about 8% of years at the nearest NOAA station (Yuma Mcas, AZ), so there is no reliable average last frost date.

When is the first frost in Somerton, AZ?

Frost occurs in about 8% of years at the nearest NOAA station.

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 85350Somerton, AZ

Frost occurs in about 8% of years near Somerton, based on NOAA 1991-2020 records for the Yuma Mcas, AZ station.

Frost occurs in about 8% of years. Frost-tender plants can usually grow year-round, but cover them if a rare cold snap is forecast.

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 14 · Jan 6 · Feb 6	Dec 11 · Dec 30 · Jan 28	364 days	51%
Frost / freeze (32°F)	—	—	365 days	8%
Hard freeze (28°F)	—	—	365 days	1%

Where these dates come from

ZIP code 85350 is matched to the NOAA station Yuma Mcas, AZ, 13.2 km away, at 213 ft elevation (115 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Yuma Mcas, AZ (used)	213 ft	—	—
Yuma Quartermaster Depot, AZ	160 ft	Jan 8	Dec 28
Yuma Proving Ground, AZ	324 ft	Jan 4	Dec 25
Yuma 27 Ene, AZ	620 ft	Jan 11	Dec 21

Frost dates near Somerton

Gadsden, AZ 85336 · last —, first —
Yuma, AZ 85366 · last —, first —
San Luis, AZ 85349 · last —, first —
Bard, CA 92222 · last Jan 8, first Dec 28
Winterhaven, CA 92283 · last Jan 4, first Dec 25
Wellton, AZ 85356 · last Feb 13, first Dec 1
Holtville, CA 92250 · last Jan 3, first Dec 27
Heber, CA 92249 · last Jan 3, first Dec 27

Frequently asked questions

When is the last frost in Somerton, AZ?: Frost occurs in about 8% of years at the nearest NOAA station (Yuma Mcas, AZ), so there is no reliable average last frost date.
When is the first frost in Somerton, AZ?: Frost occurs in about 8% of years at the nearest NOAA station.
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.