Frost dates in Glendale, Arizona

NOAA 1991–2020 normals for a 32 °F freeze. Low spots and the edge of town run colder than downtown.

Short answer

The average last spring frost in Glendale is January 20, and the average first fall frost is December 15, from NOAA's Youngtown station, 8 miles from the middle of Glendale. 1 year in 10 the last frost comes after February 18, and the first one by November 28. That leaves about 329 frost-free days. Glendale is in USDA planting zone 9b.

Weather stations around Glendale

The first row is the date most people in Glendale go by. The others show how far the dates move across the area.

Station	Last spring frost	First fall frost	Frost-free
Youngtown 8 mi away, 1,135 ft	January 20 1 in 10 after February 18	December 15 1 in 10 by November 28	329 days
Litchfield Park 10 mi away, 1,040 ft	January 7 1 in 10 after February 5	December 24 1 in 10 by December 6	351 days
Phoenix Deer Valley Muni Airport 12 mi away, 1,455 ft	January 8 1 in 10 after February 12	December 25 1 in 10 by December 5	351 days
South Phoenix 13 mi away, 1,155 ft	January 21 1 in 10 after February 20	December 16 1 in 10 by November 29	329 days
Phoenix Sky Harbor Intl Airport 13 mi away, 1,107 ft	January 5 1 in 10 after January 22	January 3 1 in 10 by December 18	363 days

Distances are from the middle of Glendale as the Census Bureau maps it. The average date is NOAA's 50% date: half of years have a later last frost, or an earlier first one. Plan by the 1-in-10 date if a freeze would cost you plants. The planting zone is the USDA 2023 zone for ZIP code 85301, at the middle of the city.

Your exact ZIP code

Glendale covers a lot of ground. For the station nearest your own street, and its planting zone, type your ZIP code.

How these dates work

Frost dates come from NOAA's 1991 to 2020 Climate Normals, which work out from each weather station's daily lows how likely the last spring freeze and the first fall freeze (32 °F) are by each date. We use the station nearest the middle of your ZIP code and show its height and distance, since a station on a hill or by a lake can differ from your yard.

The average date is the 50% date: half of years have a freeze after the spring date or before the fall one. The 1-in-10 dates are NOAA's 10% dates, the ones to plan by if a late freeze would cost you plants. Within one yard, cold air pools in low spots while walls and paving hold heat, so some corners freeze before others.

More frost dates

All of Arizona, station by station.

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