Car Battery Cold-Start in Maryland

In Maryland, local car battery deadlines run from Nov 1 to Dec 5, with a median around Nov 19 — 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

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

All Maryland cities

City	Local deadline	Median first 28°F
Bowie	Nov 1	Nov 1	View →	Checklist
Hagerstown	Nov 9	Nov 9	View →	Checklist
Gaithersburg	Nov 19	Nov 19	View →	Checklist
Rockville	Nov 19	Nov 19	View →	Checklist
Frederick	Nov 21	Nov 21	View →	Checklist
Annapolis	Nov 28	Nov 28	View →	Checklist
Baltimore	Dec 5	Dec 5	View →	Checklist

Back to the national Car Battery Cold-Start guide, or see the methodology.

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