Sump Pump Test in Maryland

In Maryland, local sump pump deadlines run from Mar 24 to Apr 22, with a median around Apr 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.

Jump to a city

Notable cities

Baltimore — earliest deadline in the state
Bowie — latest deadline in the state
Rockville — near the state median

All Maryland cities

City	Local deadline	Median first 28°F
Baltimore	Mar 24	Dec 5	View →	Checklist
Annapolis	Mar 27	Nov 28	View →	Checklist
Gaithersburg	Apr 1	Nov 19	View →	Checklist
Rockville	Apr 1	Nov 19	View →	Checklist
Frederick	Apr 2	Nov 21	View →	Checklist
Hagerstown	Apr 11	Nov 9	View →	Checklist
Bowie	Apr 22	Nov 1	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.