Mosquito season in Elko County, NV: when it starts and ends
Mosquito months in Elko County
In a normal year mosquito season in Elko County, NV starts around May 23 and ends around September 7, about 15 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Elko County, and when
- Start tipping out standing water weekly by May 9.
- Book any yard treatment for late May, ahead of the July peak.
- Repellent can go away after September 7.
- 2 West Nile cases since 2016 (last 2017): you should use repellent at dusk July, more so if over 60.
Elko County against the rest of NV
Elko County has the 16th longest season of 17 NV counties, at 107 days against 323 in Clark County and 107 in White Pine County. Its mean temperature is 44.6°F.
- Humboldt County: May 13 to September 25 (135 days, 3 WNV)
- Churchill County: May 28 to September 24 (119 days, 21 WNV)
- White Pine County: June 3 to September 18 (107 days, 0 WNV)
West Nile in Elko County
From 1999 to 2025, CDC ArboNET counted 29 human West Nile cases in Elko County (6 neuroinvasive) across 5 years. The worst was 2006 with 23; the latest was 2017.
Background: when the season starts across the US; how the dates are worked out.