RV Winterization in Montana

In Montana, local rv deadlines run from Sep 23 to Oct 2, with a median around Oct 1 — 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.

Motorhome parked on a snowy street in falling snow — drain and antifreeze the water system before the first hard freeze — Montana deadlines city by city — Photo: Arlind Photography / Unsplash

Jump to a city

Notable cities

Bozeman — earliest deadline in the state
Missoula — latest deadline in the state
Great Falls — near the state median

All Montana cities

City	Local deadline	Median first 28°F
Bozeman	Sep 23	Oct 3	View →	Checklist
Helena	Sep 27	Oct 7	View →	Checklist
Great Falls	Oct 1	Oct 11	View →	Checklist
Billings	Oct 2	Oct 12	View →	Checklist
Missoula	Oct 2	Oct 12	View →	Checklist

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

RV Winterization in Montana: related searches

Montana homeowners search for: RV winterization checklist, how to winterize a camper, and "rv winterization near me" — every city page below answers those with local NOAA dates.

RV winterization checklisthow to winterize a camperRV antifreeze how many gallonswater heater bypass RVblow out RV water linesnon-toxic RV antifreezeRV low point drainwinterize travel trailer

Back to the national RV Winterization guide, or see the methodology. You can also compare how the rv winterization window shifts in Missouri and Nebraska.

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