FrostList

Sprinkler Winterization in Colorado

In Colorado, local sprinklers deadlines run from Sep 30 to Oct 23, with a median around Oct 8 — 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 — Colorado deadlines city by city
Photo: Pexels

Notable cities

All Colorado cities

CityLocal deadlineMedian first 28°F
LovelandSep 30Oct 10View →Checklist
LongmontOct 2Oct 12View →Checklist
Castle RockOct 2Oct 12View →Checklist
ParkerOct 2Oct 12View →Checklist
ArvadaOct 4Oct 14View →Checklist
BoulderOct 5Oct 15View →Checklist
Colorado SpringsOct 6Oct 16View →Checklist
LakewoodOct 6Oct 16View →Checklist
Fort CollinsOct 7Oct 17View →Checklist
CentennialOct 7Oct 17View →Checklist
AuroraOct 8Oct 18View →Checklist
PuebloOct 8Oct 18View →Checklist
GreeleyOct 8Oct 18View →Checklist
Commerce CityOct 8Oct 18View →Checklist
DenverOct 11Oct 21View →Checklist
ThorntonOct 11Oct 21View →Checklist
WestminsterOct 11Oct 21View →Checklist
BroomfieldOct 11Oct 21View →Checklist
LittletonOct 11Oct 21View →Checklist
NorthglennOct 11Oct 21View →Checklist
Grand JunctionOct 23Nov 2View →Checklist
OctNovLovelandSep 30LongmontOct 2Castle RockOct 2ParkerOct 2ArvadaOct 4BoulderOct 5Colorado SpringsOct 6LakewoodOct 6Fort CollinsOct 7CentennialOct 7AuroraOct 8PuebloOct 8GreeleyOct 8Commerce CityOct 8DenverOct 11ThorntonOct 11WestminsterOct 11BroomfieldOct 11

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

Sprinkler Winterization in Colorado: related searches

Colorado 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 California and Connecticut.

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