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.

Jump to a city

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	Sep 30	Oct 10	View →	Checklist
Longmont	Oct 2	Oct 12	View →	Checklist
Castle Rock	Oct 2	Oct 12	View →	Checklist
Parker	Oct 2	Oct 12	View →	Checklist
Arvada	Oct 4	Oct 14	View →	Checklist
Boulder	Oct 5	Oct 15	View →	Checklist
Colorado Springs	Oct 6	Oct 16	View →	Checklist
Lakewood	Oct 6	Oct 16	View →	Checklist
Fort Collins	Oct 7	Oct 17	View →	Checklist
Centennial	Oct 7	Oct 17	View →	Checklist
Aurora	Oct 8	Oct 18	View →	Checklist
Pueblo	Oct 8	Oct 18	View →	Checklist
Greeley	Oct 8	Oct 18	View →	Checklist
Commerce City	Oct 8	Oct 18	View →	Checklist
Denver	Oct 11	Oct 21	View →	Checklist
Thornton	Oct 11	Oct 21	View →	Checklist
Westminster	Oct 11	Oct 21	View →	Checklist
Broomfield	Oct 11	Oct 21	View →	Checklist
Littleton	Oct 11	Oct 21	View →	Checklist
Northglenn	Oct 11	Oct 21	View →	Checklist
Grand Junction	Oct 23	Nov 2	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.