Arizona climate almanac
Arizona's climate, read through its 70 NOAA stations, is mainly desert southwest (arizona, nevada, inland california), then mild humid continental (northeast, midwest, pacific northwest). The mean frost-free season runs from about April 1 to November 15, roughly 229 days.
Stations 70 NOAA 1991-2020 normals
Mean frost-free season 229 days 91 to 365 across the state
Typical frost window April 1 - November 15 Median last and first frost
Main climate types 2 Desert Southwest (Arizona, Nevada, inland California) (43); Mild humid continental (Northeast, Midwest, Pacific Northwest) (27)
What this means for your home
In Arizona, the difference between the shortest and longest frost-free pockets is 274 days. That is the difference between a tomato crop that struggles and one that runs into October, between one fertilizer timing and another. Set your place above to tune every date to your nearest station.
Major cities in Arizona
Pick a city to see its frost and planting dates, or set your own place above.