Mosquito season in Harlan County, NE: when it starts and ends
Mosquito months in Harlan County
In a normal year mosquito season in Harlan County, NE starts around April 13 and ends around October 22, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Harlan 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 22.
- 2 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Harlan County against the rest of NE
Harlan County has the 14th longest season of 93 NE counties, at 191 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 51.7°F.
- Hamilton County: April 14 to October 22 (192 days, 15 WNV)
- Jefferson County: April 14 to October 23 (192 days, 0 WNV)
- Sarpy County: April 14 to October 22 (191 days, 56 WNV)
- York County: April 14 to October 22 (191 days, 12 WNV)
West Nile in Harlan County
From 1999 to 2025, CDC ArboNET counted 29 human West Nile cases in Harlan County (7 neuroinvasive) across 10 years. The worst was 2003 with 17; the latest was 2023.
More: how the dates are worked out · when the season starts across the US.