Mosquito season in Dorchester County, MD: when it starts and ends
Mosquito months in Dorchester County
In a normal year mosquito season in Dorchester County, MD starts around March 27 and ends around November 14, about 33 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Dorchester County, and when
- Start tipping out standing water weekly by March 13.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 14.
- No West Nile cases since 2016, so bites in Dorchester County are a nuisance; check window screens.
Dorchester County against the rest of MD
Dorchester County has the 6th longest season of 24 MD counties, at 232 days against 235 in Wicomico County and 175 in Garrett County. Its mean temperature is 58.2°F.
- Anne Arundel County: March 26 to November 13 (232 days, 12 WNV)
- Talbot County: March 26 to November 13 (232 days, 2 WNV)
- Somerset County: March 27 to November 13 (231 days, 0 WNV)
- Worcester County: March 29 to November 11 (227 days, 0 WNV)
West Nile in Dorchester County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Dorchester County (4 neuroinvasive) across 2 years. The worst was 2012 with 2; the latest was 2012.
Background: when mosquitoes go away for the winter; how the dates are worked out.