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 frost timing
Counties sorted by last spring frost.
Latest at top, earliest at bottom. In most states this matches the north-to-south gradient.
- Apache CountySpring May 7·Fall Oct 17163-day season
- Navajo CountySpring May 1·Fall Oct 20172-day season
- Coconino CountySpring Apr 26·Fall Nov 2190-day season
- Pima CountySpring Apr 7·Fall Nov 17224-day season
- Yavapai CountySpring Apr 1·Fall Nov 8221-day season
- Cochise CountySpring Mar 27·Fall Nov 13231-day season
- Graham CountySpring Mar 13·Fall Nov 16248-day season
- Santa Cruz CountySpring Feb 23·Fall Nov 30280-day season
- Mohave CountySpring Feb 16·Fall Dec 9296-day season
- Greenlee CountySpring Feb 5·Fall Dec 5303-day season
- Yuma CountySpring Jan 23·Fall Dec 11322-day season
- Gila CountySpring Jan 14·Fall Jan 10361-day season
- Pinal CountySpring Jan 8·Fall Dec 26352-day season
- La Paz CountySpring Jan 7·Fall Dec 21348-day season
- Maricopa CountySpring Jan 5·Fall Jan 4364-day season