Mosquito season in Grant County, NE: when it starts and ends
Mosquito months in Grant County
In a normal year mosquito season in Grant County, NE starts around April 27 and ends around October 12, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Grant County, and when
- Start tipping out standing water weekly by April 13.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 12.
- No West Nile cases since 2016, so bites in Grant County are a nuisance; check window screens.
Grant County against the rest of NE
Grant County has the 76th longest season of 93 NE counties, at 167 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 48.2°F.
- Garfield County: April 27 to October 12 (168 days, 1 WNV)
- Deuel County: April 28 to October 13 (168 days, 6 WNV)
- Hooker County: April 28 to October 12 (167 days, 2 WNV)
- McPherson County: April 28 to October 12 (167 days, 0 WNV)
West Nile in Grant County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Grant County (1 neuroinvasive) across 5 years. The worst was 2014 with 1; the latest was 2014.
Background: when the season starts across the US; how the dates are worked out.