When is the last frost in Phoenix, AZ?

For ZIP code 85024, the average last spring frost (32°F) is January 8, based on NOAA 1991-2020 climate normals for the Phoenix Deer Valley Muni Ap, AZ weather station. There is a 1-in-10 chance of a frost after February 12.

When is the first frost in Phoenix, AZ?

The average first fall frost (32°F) is December 25. There is a 1-in-10 chance of frost by December 5, so tender plants are at risk from that point on.

How long is the growing season in 85024?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 354 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 85024Phoenix, AZ

The average last spring frost in Phoenix is January 8 and the average first fall frost is December 25, giving a typical growing season of about 354 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 8
Average first fall frost: Dec 25
Growing season: 354 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 1 · Feb 1 · Mar 2	Nov 25 · Dec 11 · Dec 29	314 days	99%
Frost / freeze (32°F)	Dec 16 · Jan 8 · Feb 12	Dec 5 · Dec 25 · Jan 23	354 days	70%
Hard freeze (28°F)	Dec 15 · Jan 8 · Feb 2	Dec 14 · Jan 7 · Feb 1	365 days	17%

Where these dates come from

ZIP code 85024 is matched to the NOAA station Phoenix Deer Valley Muni Ap, AZ, 5.1 km away, at 1,455 ft elevation (169 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Phoenix Deer Valley Muni Ap, AZ (used)	1,455 ft	Jan 8	Dec 25
Scottsdale Muni Ap, AZ	1,473 ft	Jan 6	Dec 26
Pinnacle Peak, AZ	2,565 ft	Jan 27	Dec 21
Carefree, AZ	2,530 ft	Feb 4	Dec 16

Frost dates near Phoenix

Phoenix, AZ 85022 · last Jan 8, first Dec 25
Scottsdale, AZ 85254 · last Jan 6, first Dec 26
Glendale, AZ 85308 · last Jan 8, first Dec 25
Paradise Valley, AZ 85253 · last Jan 6, first Dec 26
Peoria, AZ 85382 · last Jan 20, first Dec 15
Luke Air Force Base, AZ 85309 · last Jan 20, first Dec 15
Cave Creek, AZ 85327 · last Feb 4, first Dec 16
Carefree, AZ 85377 · last Feb 4, first Dec 16

Frequently asked questions

When is the last frost in Phoenix, AZ?: For ZIP code 85024, the average last spring frost (32°F) is January 8, based on NOAA 1991-2020 climate normals for the Phoenix Deer Valley Muni Ap, AZ weather station. There is a 1-in-10 chance of a frost after February 12.
When is the first frost in Phoenix, AZ?: The average first fall frost (32°F) is December 25. There is a 1-in-10 chance of frost by December 5, so tender plants are at risk from that point on.
How long is the growing season in 85024?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 354 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.