Mosquito season in Thomas County, NE: when it starts and ends
Mosquito months in Thomas County
In a normal year mosquito season in Thomas County, NE starts around May 1 and ends around October 10, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Thomas County, and when
- Start tipping out standing water weekly by April 17.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 10.
- 2 West Nile cases since 2016 (last 2023): you should use repellent at dusk July to August, more so if over 60.
Thomas County against the rest of NE
Thomas County has the 85th longest season of 93 NE counties, at 162 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 48.3°F.
- Box Butte County: May 1 to October 10 (163 days, 11 WNV)
- Blaine County: May 1 to October 10 (162 days, 1 WNV)
- Keya Paha County: May 1 to October 9 (161 days, 0 WNV)
- Custer County: May 2 to October 9 (160 days, 14 WNV)
West Nile in Thomas County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Thomas County (2 neuroinvasive) across 3 years. The worst was 2023 with 2; the latest was 2023.
See how the dates are worked out, and when the season starts across the US.