Mosquito season in Worcester County, MD: when it starts and ends
Mosquito months in Worcester County
In a normal year mosquito season in Worcester County, MD starts around March 29 and ends around November 11, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Worcester County, and when
- Start tipping out standing water weekly by March 15.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 11.
- No West Nile cases since 2016, so bites in Worcester County are a nuisance; check window screens.
Worcester County against the rest of MD
Worcester County has the 8th longest season of 24 MD counties, at 227 days against 235 in Wicomico County and 175 in Garrett County. Its mean temperature is 58.9°F.
- Dorchester County: March 27 to November 14 (232 days, 0 WNV)
- Somerset County: March 27 to November 13 (231 days, 0 WNV)
- Baltimore County: March 30 to November 9 (223 days, 26 WNV)
- Howard County: March 30 to November 8 (223 days, 1 WNV)
West Nile in Worcester County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Worcester County (1 neuroinvasive) across 2 years. The worst was 2012 with 1; the latest was 2012.
Background: when the season starts across the US; how the dates are worked out.