When is the last frost in Parks, AZ?

For ZIP code 86018, the average last spring frost (32°F) is June 21, based on NOAA 1991-2020 climate normals for the Bellemont Wfo, AZ weather station. There is a 1-in-10 chance of a frost after July 4.

When is the first frost in Parks, AZ?

The average first fall frost (32°F) is September 17. There is a 1-in-10 chance of frost by September 3, so tender plants are at risk from that point on.

How long is the growing season in 86018?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 85 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 86018Parks, AZ

The average last spring frost in Parks is June 21 and the average first fall frost is September 17, giving a typical growing season of about 85 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 21
Average first fall frost: Sep 17
Growing season: 85 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)	—	—	64 days	100%
Frost / freeze (32°F)	Jun 9 · Jun 21 · Jul 4	Sep 3 · Sep 17 · Sep 29	85 days	100%
Hard freeze (28°F)	May 28 · Jun 9 · Jun 22	Sep 15 · Sep 27 · Oct 9	107 days	100%

Where these dates come from

ZIP code 86018 is matched to the NOAA station Bellemont Wfo, AZ, 12 km away, at 7,152 ft elevation (92 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Bellemont Wfo, AZ (used)	7,152 ft	Jun 21	Sep 17
Ft Valley, AZ	7,347 ft	Jun 11	Sep 25
Williams, AZ	6,909 ft	May 22	Oct 5
Flagstaff 4 Sw, AZ	7,125 ft	Jun 23	Sep 15

Frost dates near Parks

Bellemont, AZ 86015 · last Jun 21, first Sep 17
Flagstaff, AZ 86005 · last Jun 4, first Sep 28
Williams, AZ 86046 · last May 9, first Oct 19
Munds Park, AZ 86017 · last Jun 10, first Sep 27
Sedona, AZ 86339 · last Apr 1, first Nov 17
Ash Fork, AZ 86320 · last May 10, first Oct 15
Clarkdale, AZ 86324 · last Mar 30, first Nov 10
Jerome, AZ 86331 · last Mar 26, first Nov 25

Frequently asked questions

When is the last frost in Parks, AZ?: For ZIP code 86018, the average last spring frost (32°F) is June 21, based on NOAA 1991-2020 climate normals for the Bellemont Wfo, AZ weather station. There is a 1-in-10 chance of a frost after July 4.
When is the first frost in Parks, AZ?: The average first fall frost (32°F) is September 17. There is a 1-in-10 chance of frost by September 3, so tender plants are at risk from that point on.
How long is the growing season in 86018?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 85 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.