Sump Pump Test in Colorado
In Colorado, local sump pump deadlines run from Apr 14 to May 10, with a median around May 3 — 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
- Grand Junction — earliest deadline in the state
- Loveland — latest deadline in the state
- Colorado Springs — near the state median
All Colorado cities
| City | Local deadline | Median first 28°F | ||
|---|---|---|---|---|
| Grand Junction | Apr 14 | Nov 2 | View → | Checklist |
| Denver | Apr 30 | Oct 21 | View → | Checklist |
| Pueblo | Apr 30 | Oct 18 | View → | Checklist |
| Fort Collins | May 2 | Oct 17 | View → | Checklist |
| Thornton | May 2 | Oct 21 | View → | Checklist |
| Westminster | May 2 | Oct 21 | View → | Checklist |
| Greeley | May 2 | Oct 18 | View → | Checklist |
| Broomfield | May 2 | Oct 21 | View → | Checklist |
| Littleton | May 2 | Oct 21 | View → | Checklist |
| Northglenn | May 2 | Oct 21 | View → | Checklist |
| Colorado Springs | May 3 | Oct 16 | View → | Checklist |
| Lakewood | May 3 | Oct 16 | View → | Checklist |
| Aurora | May 4 | Oct 18 | View → | Checklist |
| Commerce City | May 4 | Oct 18 | View → | Checklist |
| Arvada | May 5 | Oct 14 | View → | Checklist |
| Centennial | May 5 | Oct 17 | View → | Checklist |
| Boulder | May 6 | Oct 15 | View → | Checklist |
| Longmont | May 7 | Oct 12 | View → | Checklist |
| Castle Rock | May 9 | Oct 12 | View → | Checklist |
| Parker | May 9 | Oct 12 | View → | Checklist |
| Loveland | May 10 | Oct 10 | View → | Checklist |
Back to the national Sump Pump Test guide, or see the methodology.
Data: NOAA NCEI 1991–2020 U.S. Climate Normals; live outlook by Open-Meteo. Last updated: July 11, 2026.