Sump Pump Test in Delaware

In Delaware, local sump pump deadlines run from Apr 4 to Apr 7, with a median around Apr 7 — 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 Delaware cities

City	Local deadline	Median first 28°F
Dover	Apr 4	Nov 16	View →	Checklist
Wilmington	Apr 7	Nov 15	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.