Mosquito season in Bristol County, RI: when it starts and ends
Mosquito months in Bristol County
In a normal year mosquito season in Bristol County, RI starts around April 17 and ends around October 30, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Bristol County, and when
- Start tipping out standing water weekly by April 3.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 30.
- No West Nile cases since 2016, so bites in Bristol County are a nuisance; check window screens.
Bristol County against the rest of RI
Bristol County has the 1st longest season of 5 RI counties, at 195 days against 195 in Bristol County and 181 in Washington County. Its mean temperature is 52.4°F.
- Newport County: April 23 to October 31 (192 days, 4 WNV)
- Kent County: April 19 to October 22 (185 days, 0 WNV)
West Nile in Bristol County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Bristol County (1 neuroinvasive) across 2 years. The worst was 2012 with 1; the latest was 2012.
See how the dates are worked out, and when mosquitoes go away for the winter.