Ice Dam Prevention in Colorado
In Colorado, local ice dams deadlines run from Aug 16 to Oct 16, with a median around Sep 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.
Notable cities
- Arvada — earliest deadline in the state
- Grand Junction — latest deadline in the state
- Centennial — near the state median
All Colorado cities
| City | Local deadline | Median first 28°F | ||
|---|---|---|---|---|
| Arvada | Aug 16 | Oct 14 | View → | Checklist |
| Boulder | Aug 16 | Oct 15 | View → | Checklist |
| Denver | Sep 15 | Oct 21 | View → | Checklist |
| Colorado Springs | Sep 15 | Oct 16 | View → | Checklist |
| Aurora | Sep 15 | Oct 18 | View → | Checklist |
| Fort Collins | Sep 15 | Oct 17 | View → | Checklist |
| Lakewood | Sep 15 | Oct 16 | View → | Checklist |
| Thornton | Sep 15 | Oct 21 | View → | Checklist |
| Westminster | Sep 15 | Oct 21 | View → | Checklist |
| Pueblo | Sep 15 | Oct 18 | View → | Checklist |
| Centennial | Sep 15 | Oct 17 | View → | Checklist |
| Greeley | Sep 15 | Oct 18 | View → | Checklist |
| Loveland | Sep 15 | Oct 10 | View → | Checklist |
| Broomfield | Sep 15 | Oct 21 | View → | Checklist |
| Castle Rock | Sep 15 | Oct 12 | View → | Checklist |
| Commerce City | Sep 15 | Oct 18 | View → | Checklist |
| Parker | Sep 15 | Oct 12 | View → | Checklist |
| Littleton | Sep 15 | Oct 21 | View → | Checklist |
| Northglenn | Sep 15 | Oct 21 | View → | Checklist |
| Grand Junction | Oct 16 | Nov 2 | 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.