When is the last frost in Casa Grande, AZ?

For ZIP code 85194, the average last spring frost (32°F) is February 5, based on NOAA 1991-2020 climate normals for the Casa Grande, AZ weather station. There is a 1-in-10 chance of a frost after February 28.

When is the first frost in Casa Grande, AZ?

The average first fall frost (32°F) is December 6. There is a 1-in-10 chance of frost by November 18, so tender plants are at risk from that point on.

How long is the growing season in 85194?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 305 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 85194Casa Grande, AZ

The average last spring frost in Casa Grande is February 5 and the average first fall frost is December 6, giving a typical growing season of about 305 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Feb 5
Average first fall frost: Dec 6
Growing season: 305 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)	Jan 31 · Feb 26 · Mar 16	Nov 7 · Nov 24 · Dec 11	271 days	100%
Frost / freeze (32°F)	Jan 5 · Feb 5 · Feb 28	Nov 18 · Dec 6 · Dec 29	305 days	99%
Hard freeze (28°F)	Dec 16 · Jan 14 · Feb 15	Nov 29 · Dec 22 · Jan 24	340 days	79%

Where these dates come from

ZIP code 85194 is matched to the NOAA station Casa Grande, AZ, 8.4 km away, at 1,400 ft elevation (34 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Casa Grande, AZ (used)	1,400 ft	Feb 5	Dec 6
Robson Rch, AZ	1,495 ft	Feb 7	Dec 3
Casa Grande Nm, AZ	1,419 ft	Feb 17	Nov 29
Eloy 4 Ne, AZ	1,545 ft	Feb 24	Nov 28

Frost dates near Casa Grande

Coolidge, AZ 85128 · last Feb 17, first Nov 29
Casa Grande, AZ 85130 · last Feb 5, first Dec 6
Arizona City, AZ 85123 · last Feb 28, first Nov 21
Eloy, AZ 85131 · last Feb 24, first Nov 28
Valley Farms, AZ 85191 · last Feb 17, first Nov 29
Florence, AZ 85132 · last Feb 17, first Nov 29
Sacaton, AZ 85147 · last Feb 17, first Nov 29
Picacho, AZ 85141 · last Feb 6, first Dec 9

Frequently asked questions

When is the last frost in Casa Grande, AZ?: For ZIP code 85194, the average last spring frost (32°F) is February 5, based on NOAA 1991-2020 climate normals for the Casa Grande, AZ weather station. There is a 1-in-10 chance of a frost after February 28.
When is the first frost in Casa Grande, AZ?: The average first fall frost (32°F) is December 6. There is a 1-in-10 chance of frost by November 18, so tender plants are at risk from that point on.
How long is the growing season in 85194?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 305 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.