Mosquito season in Prince George's County, MD: when it starts and ends
Mosquito months in Prince George's County
In a normal year mosquito season in Prince George's County, MD starts around April 1 and ends around November 5, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Prince George's County, and when
- Start tipping out standing water weekly by March 18.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 5.
- 17 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to August, and check MD spray notices.
Prince George's County against the rest of MD
Prince George's County has the 15th longest season of 24 MD counties, at 219 days against 235 in Wicomico County and 175 in Garrett County. Its mean temperature is 56.1°F.
- Frederick County: March 30 to November 5 (220 days, 13 WNV)
- Montgomery County: March 30 to November 5 (220 days, 34 WNV)
- Calvert County: April 2 to November 6 (218 days, 1 WNV)
- Charles County: April 2 to November 6 (218 days, 2 WNV)
West Nile in Prince George's County
From 1999 to 2025, CDC ArboNET counted 52 human West Nile cases in Prince George's County (41 neuroinvasive) across 19 years. The worst was 2018 with 7; the latest was 2024.
See how the dates are worked out, and reading the West Nile counts.