Mosquito season in Newport County, RI: when it starts and ends
Mosquito months in Newport County
In a normal year mosquito season in Newport County, RI starts around April 23 and ends around October 31, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Newport County, and when
- Start tipping out standing water weekly by April 9.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 31.
- 4 West Nile cases since 2016 (last 2024): you should use repellent at dusk July to August, more so if over 60.
Newport County against the rest of RI
Newport County has the 2nd longest season of 5 RI counties, at 192 days against 195 in Bristol County and 181 in Washington County. Its mean temperature is 51.5°F.
- Bristol County: April 17 to October 30 (195 days, 0 WNV)
- Kent County: April 19 to October 22 (185 days, 0 WNV)
- Providence County: April 20 to October 22 (185 days, 12 WNV)
West Nile in Newport County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Newport County (3 neuroinvasive) across 5 years. The worst was 2024 with 2; the latest was 2024.
More: how the dates are worked out · reading the West Nile counts.