Mosquito season in Wicomico County, MD: when it starts and ends
Mosquito months in Wicomico County
In a normal year mosquito season in Wicomico County, MD starts around March 24 and ends around November 15, about 34 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Wicomico County, and when
- Start tipping out standing water weekly by March 10.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 15.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
Wicomico County against the rest of MD
Wicomico County has the 1st longest season of 24 MD counties, at 235 days against 235 in Wicomico County and 175 in Garrett County. Its mean temperature is 58.4°F.
- Baltimore city: March 25 to November 15 (235 days, 18 WNV)
- St. Mary's County: March 26 to November 15 (234 days, 0 WNV)
West Nile in Wicomico County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Wicomico County (1 neuroinvasive) across 2 years. The worst was 2025 with 1; the latest was 2025.
Background: when the season starts across the US; how the dates are worked out.