Mosquito season in Lander County, NV: when it starts and ends
Mosquito months in Lander County
In a normal year mosquito season in Lander County, NV starts around May 12 and ends around October 1, about 20 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lander County, and when
- Start tipping out standing water weekly by April 28.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after October 1.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Lander County against the rest of NV
Lander County has the 13th longest season of 17 NV counties, at 142 days against 323 in Clark County and 107 in White Pine County. Its mean temperature is 48°F.
- Pershing County: May 4 to October 4 (153 days, 0 WNV)
- Eureka County: May 12 to October 1 (142 days, 0 WNV)
- Humboldt County: May 13 to September 25 (135 days, 3 WNV)
- Churchill County: May 28 to September 24 (119 days, 21 WNV)
West Nile in Lander County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Lander County (0 neuroinvasive) across 2 years. The worst was 2006 with 2; the latest was 2025.
Background: when mosquitoes go away for the winter; how the dates are worked out.