Mosquito season in Douglas County, NV: when it starts and ends
Mosquito months in Douglas County
In a normal year mosquito season in Douglas County, NV starts around May 11 and ends around October 13, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Douglas County, and when
- Start tipping out standing water weekly by April 27.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after October 13.
- 12 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July, and check NV spray notices.
Douglas County against the rest of NV
Douglas County has the 10th longest season of 17 NV counties, at 155 days against 323 in Clark County and 107 in White Pine County. Its mean temperature is 47.6°F.
- Nye County: April 25 to October 11 (169 days, 2 WNV)
- Washoe County: April 28 to October 13 (168 days, 31 WNV)
- Pershing County: May 4 to October 4 (153 days, 0 WNV)
- Eureka County: May 12 to October 1 (142 days, 0 WNV)
West Nile in Douglas County
From 1999 to 2025, CDC ArboNET counted 37 human West Nile cases in Douglas County (13 neuroinvasive) across 9 years. The worst was 2006 with 18; the latest was 2018.
Background: reading the West Nile counts; how the dates are worked out.