Sump Pump Test in Montana

In Montana, local sump pump deadlines run from May 6 to May 26, with a median around May 10 — 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

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

All Montana cities

City	Local deadline	Median first 28°F
Great Falls	May 6	Oct 11	View →	Checklist
Helena	May 9	Oct 7	View →	Checklist
Billings	May 10	Oct 12	View →	Checklist
Missoula	May 10	Oct 12	View →	Checklist
Bozeman	May 26	Oct 3	View →	Checklist

Back to the national Sump Pump Test guide, or see the methodology.

Data: NOAA NCEI 1991–2020 U.S. Climate Normals; live outlook by Open-Meteo. Last updated: July 11, 2026.