Car Battery Cold-Start in Colorado
In Colorado, local car battery deadlines run from Oct 10 to Nov 2, with a median around Oct 18 — 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
- Loveland — earliest deadline in the state
- Grand Junction — latest deadline in the state
- Aurora — near the state median
All Colorado cities
| City | Local deadline | Median first 28°F | ||
|---|---|---|---|---|
| Loveland | Oct 10 | Oct 10 | View → | Checklist |
| Longmont | Oct 12 | Oct 12 | View → | Checklist |
| Castle Rock | Oct 12 | Oct 12 | View → | Checklist |
| Parker | Oct 12 | Oct 12 | View → | Checklist |
| Arvada | Oct 14 | Oct 14 | View → | Checklist |
| Boulder | Oct 15 | Oct 15 | View → | Checklist |
| Colorado Springs | Oct 16 | Oct 16 | View → | Checklist |
| Lakewood | Oct 16 | Oct 16 | View → | Checklist |
| Fort Collins | Oct 17 | Oct 17 | View → | Checklist |
| Centennial | Oct 17 | Oct 17 | View → | Checklist |
| Aurora | Oct 18 | Oct 18 | View → | Checklist |
| Pueblo | Oct 18 | Oct 18 | View → | Checklist |
| Greeley | Oct 18 | Oct 18 | View → | Checklist |
| Commerce City | Oct 18 | Oct 18 | View → | Checklist |
| Denver | Oct 21 | Oct 21 | View → | Checklist |
| Thornton | Oct 21 | Oct 21 | View → | Checklist |
| Westminster | Oct 21 | Oct 21 | View → | Checklist |
| Broomfield | Oct 21 | Oct 21 | View → | Checklist |
| Littleton | Oct 21 | Oct 21 | View → | Checklist |
| Northglenn | Oct 21 | Oct 21 | View → | Checklist |
| Grand Junction | Nov 2 | Nov 2 | View → | Checklist |
Back to the national Car Battery Cold-Start guide, or see the methodology.
Data: NOAA NCEI 1991–2020 U.S. Climate Normals; live outlook by Open-Meteo. Last updated: July 11, 2026.