Mosquito season in Strafford County, NH: when it starts and ends
Mosquito months in Strafford County
In a normal year mosquito season in Strafford County, NH starts around April 28 and ends around October 14, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Strafford County, and when
- Start tipping out standing water weekly by April 14.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 14.
- No West Nile cases since 2016, so bites in Strafford County are a nuisance; check window screens.
Strafford County against the rest of NH
Strafford County has the 1st longest season of 10 NH counties, at 170 days against 170 in Strafford County and 141 in Coos County. Its mean temperature is 47.6°F.
- Rockingham County: April 28 to October 14 (169 days, 2 WNV)
- Belknap County: April 30 to October 13 (166 days, 0 WNV)
West Nile in Strafford County
CDC ArboNET lists no human West Nile cases for Strafford County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 5 of those years.
Background: when the season starts across the US; how the dates are worked out.