Frost dates · Arizona
Arizona frost dates, county by county.
Last spring frost and first fall frost probability data for all 15 counties in Arizona, computed from the NOAA 1991–2020 Climate Normals. Every county page surfaces the full probability table at three temperature thresholds plus crop-specific planting guidance.
Variation across Arizona
122 days separate the earliest and latest counties.
The median last spring frost in Maricopa County is January 5 — 122 days earlier than Apache County at May 7. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.
By geography
Arizona counties on the map.
Each polygon is a county. Click for full frost-date detail. Color shows last-spring-frost timing — sage = earliest, amber = latest.
MapList
Last spring frostEarliestMedianLatest
15 counties · click any county for full frost data