Mosquito season in Power County, ID: when it starts and ends

Mosquito months in Power County

In a normal year mosquito season in Power County, ID starts around April 26 and ends around October 11, about 24 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Power County, and when

• Start tipping out standing water weekly by April 12.
• Book any yard treatment for late April, ahead of the July peak.
• Repellent can go away after October 11.
• No West Nile cases since 2016, so bites in Power County are a nuisance; check window screens.

Power County against the rest of ID

Power County has the 8th longest season of 44 ID counties, at 168 days against 194 in Canyon County and 85 in Fremont County. Its mean temperature is 47.8°F.

• Jerome County: April 25 to October 14 (172 days, 0 WNV)
• Twin Falls County: April 26 to October 13 (171 days, 10 WNV)
• Gem County: April 28 to October 12 (167 days, 7 WNV)
• Bingham County: April 28 to October 9 (164 days, 2 WNV)

West Nile in Power County

From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Power County (0 neuroinvasive) across 1 year. The worst was 2006 with 2; the latest was 2006.

See how the dates are worked out, and when mosquitoes go away for the winter.