Mosquito season in Richardson County, NE: when it starts and ends
Mosquito months in Richardson County
In a normal year mosquito season in Richardson County, NE starts around April 8 and ends around October 25, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Richardson County, and when
- Start tipping out standing water weekly by March 25.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 25.
- 3 West Nile cases since 2016 (last 2024): you should use repellent at dusk June to August, more so if over 60.
Richardson County against the rest of NE
Richardson County has the 1st longest season of 93 NE counties, at 200 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 52.7°F.
- Fillmore County: April 11 to October 25 (197 days, 9 WNV)
- Douglas County: April 11 to October 23 (195 days, 150 WNV)
West Nile in Richardson County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Richardson County (3 neuroinvasive) across 5 years. The worst was 2018 with 2; the latest was 2024.
More: how the dates are worked out · when mosquitoes go away for the winter.