Mosquito season in Johnson County, NE: when it starts and ends
Mosquito months in Johnson County
In a normal year mosquito season in Johnson County, NE starts around April 16 and ends around October 20, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Johnson County, and when
- Start tipping out standing water weekly by April 2.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 20.
- No West Nile cases since 2016, so bites in Johnson County are a nuisance; check window screens.
Johnson County against the rest of NE
Johnson County has the 25th longest season of 93 NE counties, at 187 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 51.3°F.
- Hitchcock County: April 16 to October 21 (188 days, 3 WNV)
- Polk County: April 16 to October 21 (188 days, 5 WNV)
- Saline County: April 17 to October 21 (187 days, 3 WNV)
- Kearney County: April 16 to October 19 (186 days, 11 WNV)
West Nile in Johnson County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Johnson County (1 neuroinvasive) across 2 years. The worst was 2003 with 4; the latest was 2003.
More: how the dates are worked out · when mosquitoes go away for the winter.