Mosquito season in Rock County, NE: when it starts and ends
Mosquito months in Rock County
In a normal year mosquito season in Rock County, NE starts around April 26 and ends around October 11, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Rock County, and when
- Start tipping out standing water weekly by April 12.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 11.
- No West Nile cases since 2016, so bites in Rock County are a nuisance; check window screens.
Rock County against the rest of NE
Rock County has the 73rd longest season of 93 NE counties, at 168 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 47.7°F.
- Brown County: April 27 to October 13 (169 days, 1 WNV)
- Cheyenne County: April 27 to October 13 (169 days, 11 WNV)
- Garfield County: April 27 to October 12 (168 days, 1 WNV)
- Deuel County: April 28 to October 13 (168 days, 6 WNV)
West Nile in Rock County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Rock County (0 neuroinvasive) across 2 years. The worst was 2003 with 4; the latest was 2007.
Background: when mosquitoes go away for the winter; how the dates are worked out.