Sprinkler Winterization in Idaho
In Idaho, local sprinklers deadlines run from Oct 3 to Oct 22, with a median around Oct 20 — 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
- Idaho Falls — earliest deadline in the state
- Coeur d'Alene — latest deadline in the state
- Caldwell — near the state median
All Idaho cities
| City | Local deadline | Median first 28°F | ||
|---|---|---|---|---|
| Idaho Falls | Oct 3 | Oct 13 | View → | Checklist |
| Twin Falls | Oct 13 | Oct 23 | View → | Checklist |
| Pocatello | Oct 14 | Oct 24 | View → | Checklist |
| Nampa | Oct 15 | Oct 25 | View → | Checklist |
| Caldwell | Oct 20 | Oct 30 | View → | Checklist |
| Boise | Oct 21 | Oct 31 | View → | Checklist |
| Boise City | Oct 21 | Oct 31 | View → | Checklist |
| Meridian | Oct 21 | Oct 31 | View → | Checklist |
| Coeur d'Alene | Oct 22 | Nov 1 | View → | Checklist |
Back to the national Sprinkler Winterization guide, or see the methodology.
Data: NOAA NCEI 1991–2020 U.S. Climate Normals; live outlook by Open-Meteo. Last updated: July 11, 2026.