When is the last frost in Phoenix, AZ?

For ZIP code 85054, the average last spring frost (32°F) is January 6, based on NOAA 1991-2020 climate normals for the Scottsdale Muni Ap, AZ weather station. There is a 1-in-10 chance of a frost after February 7.

When is the first frost in Phoenix, AZ?

The average first fall frost (32°F) is December 26. There is a 1-in-10 chance of frost by December 4, so tender plants are at risk from that point on.

How long is the growing season in 85054?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 353 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 85054Phoenix, AZ

The average last spring frost in Phoenix is January 6 and the average first fall frost is December 26, giving a typical growing season of about 353 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 6
Average first fall frost: Dec 26
Growing season: 353 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 3 · Jan 30 · Feb 26	Nov 25 · Dec 11 · Dec 30	316 days	99%
Frost / freeze (32°F)	Dec 16 · Jan 6 · Feb 7	Dec 4 · Dec 26 · Jan 20	353 days	70%
Hard freeze (28°F)	Dec 15 · Jan 2 · Jan 20	Dec 14 · Jan 1 · Jan 17	365 days	13%

Where these dates come from

ZIP code 85054 is matched to the NOAA station Scottsdale Muni Ap, AZ, 6.5 km away, at 1,473 ft elevation (167 ft lower than the ZIP code's center). Nearby stations for comparison:

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

Frost dates near Phoenix

Phoenix, AZ 85050 · last Jan 8, first Dec 25
Scottsdale, AZ 85255 · last Jan 27, first Dec 21
Paradise Valley, AZ 85253 · last Jan 6, first Dec 26
Carefree, AZ 85377 · last Feb 4, first Dec 16
Cave Creek, AZ 85327 · last Feb 4, first Dec 16
Glendale, AZ 85310 · last Jan 8, first Dec 25
Fountain Hills, AZ 85268 · last Jan 6, first Dec 28
Peoria, AZ 85382 · last Jan 20, first Dec 15

Frequently asked questions

When is the last frost in Phoenix, AZ?: For ZIP code 85054, the average last spring frost (32°F) is January 6, based on NOAA 1991-2020 climate normals for the Scottsdale Muni Ap, AZ weather station. There is a 1-in-10 chance of a frost after February 7.
When is the first frost in Phoenix, AZ?: The average first fall frost (32°F) is December 26. There is a 1-in-10 chance of frost by December 4, so tender plants are at risk from that point on.
How long is the growing season in 85054?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 353 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.