FrostList

Boat Winterization in Colorado

In Colorado, local boat deadlines run from Oct 3 to Oct 26, with a median around Oct 11 — 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.

Covered boat locked in ice beside a dock on a frozen lake — winterize the engine before the first hard freeze catches it in the water — Colorado deadlines city by city
Photo: Unsplash

Notable cities

All Colorado cities

CityLocal deadlineMedian first 28°F
LovelandOct 3Oct 10View →Checklist
LongmontOct 5Oct 12View →Checklist
Castle RockOct 5Oct 12View →Checklist
ParkerOct 5Oct 12View →Checklist
ArvadaOct 7Oct 14View →Checklist
BoulderOct 8Oct 15View →Checklist
Colorado SpringsOct 9Oct 16View →Checklist
LakewoodOct 9Oct 16View →Checklist
Fort CollinsOct 10Oct 17View →Checklist
CentennialOct 10Oct 17View →Checklist
AuroraOct 11Oct 18View →Checklist
PuebloOct 11Oct 18View →Checklist
GreeleyOct 11Oct 18View →Checklist
Commerce CityOct 11Oct 18View →Checklist
DenverOct 14Oct 21View →Checklist
ThorntonOct 14Oct 21View →Checklist
WestminsterOct 14Oct 21View →Checklist
BroomfieldOct 14Oct 21View →Checklist
LittletonOct 14Oct 21View →Checklist
NorthglennOct 14Oct 21View →Checklist
Grand JunctionOct 26Nov 2View →Checklist
OctNovLovelandOct 3LongmontOct 5Castle RockOct 5ParkerOct 5ArvadaOct 7BoulderOct 8Colorado SpringsOct 9LakewoodOct 9Fort CollinsOct 10CentennialOct 10AuroraOct 11PuebloOct 11GreeleyOct 11Commerce CityOct 11DenverOct 14ThorntonOct 14WestminsterOct 14BroomfieldOct 14

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

Boat Winterization in Colorado: related searches

Colorado homeowners search for: how to winterize a boat, winterize outboard motor, and "boat winterization near me" — every city page below answers those with local NOAA dates.

how to winterize a boatwinterize outboard motorsterndrive winterizationboat shrink wrap costmarine antifreeze -100fogging oil boat engineboat engine block freeze damagedrain engine block and manifolds

Back to the national Boat Winterization guide, or see the methodology. You can also compare how the boat 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.