Mosquito season in Thayer County, NE: when it starts and ends
Mosquito months in Thayer County
In a normal year mosquito season in Thayer County, NE starts around April 13 and ends around October 23, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Thayer County, and when
- Start tipping out standing water weekly by March 30.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 23.
- 7 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Thayer County against the rest of NE
Thayer County has the 5th longest season of 93 NE counties, at 193 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 51.8°F.
- Douglas County: April 11 to October 23 (195 days, 150 WNV)
- Pawnee County: April 12 to October 24 (195 days, 1 WNV)
- Adams County: April 13 to October 22 (192 days, 17 WNV)
- Cass County: April 13 to October 22 (192 days, 12 WNV)
West Nile in Thayer County
From 1999 to 2025, CDC ArboNET counted 38 human West Nile cases in Thayer County (7 neuroinvasive) across 10 years. The worst was 2003 with 18; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.