Mosquito season in Payette County, ID: when it starts and ends
Mosquito months in Payette County
In a normal year mosquito season in Payette County, ID starts around April 9 and ends around October 19, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Payette County, and when
- Start tipping out standing water weekly by March 26.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 19.
- 6 West Nile cases since 2016 (last 2023): you should use repellent at dusk July to August, more so if over 60.
Payette County against the rest of ID
Payette County has the 2nd longest season of 44 ID counties, at 194 days against 194 in Canyon County and 85 in Fremont County. Its mean temperature is 52.4°F.
- Canyon County: April 9 to October 21 (194 days, 20 WNV)
- Ada County: April 12 to October 23 (193 days, 36 WNV)
- Gooding County: April 19 to October 15 (179 days, 9 WNV)
West Nile in Payette County
From 1999 to 2025, CDC ArboNET counted 52 human West Nile cases in Payette County (13 neuroinvasive) across 12 years. The worst was 2006 with 23; the latest was 2023.
See how the dates are worked out, and reading the West Nile counts.