Ice Dam Prevention in Arizona

In Arizona, local ice dams deadlines run from Sep 15 to Nov 15, with a median around Nov 15 — a spread of weeks that a single statewide date would miss. Find your city below; each links to local freeze odds, a live 10-day outlook, and a checklist.

Jump to a city

Notable cities

Flagstaff — earliest deadline in the state
Prescott Valley — latest deadline in the state
Prescott — near the state median

All Arizona cities

City	Local deadline	Median first 28°F
Flagstaff	Sep 15	Oct 9	View →	Checklist
Prescott	Nov 15	Oct 31	View →	Checklist
Prescott Valley	Nov 15	Nov 8	View →	Checklist

Back to the national Ice Dam Prevention guide, or see the methodology.

Data: NOAA NCEI 1991–2020 U.S. Climate Normals; live outlook by Open-Meteo. Last updated: July 11, 2026.