Mosquito season in Humboldt County, NV: when it starts and ends
Mosquito months in Humboldt County
In a normal year mosquito season in Humboldt County, NV starts around May 13 and ends around September 25, about 19 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Humboldt County, and when
- Start tipping out standing water weekly by April 29.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after September 25.
- 3 West Nile cases since 2016 (last 2017): you should use repellent at dusk July to July, more so if over 60.
Humboldt County against the rest of NV
Humboldt County has the 14th longest season of 17 NV counties, at 135 days against 323 in Clark County and 107 in White Pine County. Its mean temperature is 49.3°F.
- Eureka County: May 12 to October 1 (142 days, 0 WNV)
- Lander County: May 12 to October 1 (142 days, 1 WNV)
- Churchill County: May 28 to September 24 (119 days, 21 WNV)
- Elko County: May 23 to September 7 (107 days, 2 WNV)
West Nile in Humboldt County
From 1999 to 2025, CDC ArboNET counted 20 human West Nile cases in Humboldt County (10 neuroinvasive) across 3 years. The worst was 2006 with 14; the latest was 2017.
Background: when the season starts across the US; how the dates are worked out.