Mosquito season in Allegany County, MD: when it starts and ends
Mosquito months in Allegany County
In a normal year mosquito season in Allegany County, MD starts around April 6 and ends around October 28, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Allegany County, and when
- Start tipping out standing water weekly by March 23.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 28.
- No West Nile cases since 2016, so bites in Allegany County are a nuisance; check window screens.
Allegany County against the rest of MD
Allegany County has the 22nd longest season of 24 MD counties, at 205 days against 235 in Wicomico County and 175 in Garrett County. Its mean temperature is 53.4°F.
- Harford County: April 5 to November 2 (211 days, 9 WNV)
- Washington County: April 6 to October 31 (208 days, 3 WNV)
- Carroll County: April 9 to October 29 (203 days, 4 WNV)
- Garrett County: April 24 to October 16 (175 days, 0 WNV)
West Nile in Allegany County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Allegany County (1 neuroinvasive) across 1 year. The worst was 2014 with 1; the latest was 2014.
See how the dates are worked out, and when mosquitoes go away for the winter.