Sump Pump Test in Wyoming

In Wyoming, local sump pump deadlines run from May 10 to May 14, with a median around May 14 — 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

All Wyoming cities

City	Local deadline	Median first 28°F
Casper	May 10	Oct 6	View →	Checklist
Cheyenne	May 14	Oct 10	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.