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.

Lawn sprinkler spraying water in low sunlight — blow out irrigation lines before the first hard freeze — Idaho deadlines city by city — Photo: Pexels

Jump to a city

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

Local sprinkler winterization deadlines for Idaho cities — built from each city’s own NOAA station, not one statewide date.

Sprinkler Winterization in Idaho: related searches

Idaho homeowners search for: sprinkler blowout cost, irrigation winterization, and "sprinkler winterization near me" — every city page below answers those with local NOAA dates.

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Back to the national Sprinkler Winterization guide, or see the methodology. You can also compare how the sprinkler winterization window shifts in Georgia and Illinois.

Data: NOAA NCEI 1991–2020 U.S. Climate Normals; live outlook by Open-Meteo. Last updated: July 25, 2026.