Ice Dam Prevention in Maryland

In Maryland, local ice dams deadlines run from Nov 15 to Dec 16, with a median around Nov 15 — 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.

Icicles forming along a snowy roof edge — an early warning sign of ice dams backing water under the shingles — Maryland deadlines city by city — Photo: Valeria Boltneva / Pexels

Jump to a city

Notable cities

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

All Maryland cities

City	Local deadline	Median first 28°F
Baltimore	Nov 15	Dec 5	View →	Checklist
Frederick	Nov 15	Nov 21	View →	Checklist
Gaithersburg	Nov 15	Nov 19	View →	Checklist
Bowie	Nov 15	Nov 1	View →	Checklist
Hagerstown	Nov 15	Nov 9	View →	Checklist
Annapolis	Nov 15	Nov 28	View →	Checklist
Rockville	Dec 16	Nov 19	View →	Checklist

Local ice dam prevention deadlines for Maryland cities — built from each city’s own NOAA station, not one statewide date.

Ice Dam Prevention in Maryland: related searches

Maryland homeowners search for: ice dam removal cost, ice dam steaming, and "ice dam prevention near me" — every city page below answers those with local NOAA dates.

ice dam removal costice dam steamingroof rake for snow removalattic air sealingattic insulation R-valueheat cable for roofcalcium chloride sock ice damice and water shield

Back to the national Ice Dam Prevention guide, or see the methodology. You can also compare how the ice dam prevention window shifts in Maine and Massachusetts.

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