Mosquito season in Greeley County, NE: when it starts and ends

Mosquito months in Greeley County

In a normal year mosquito season in Greeley County, NE starts around April 25 and ends around October 11, about 24 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Greeley County, and when

• Start tipping out standing water weekly by April 11.
• 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 Greeley County are a nuisance; check window screens.

Greeley County against the rest of NE

Greeley County has the 68th longest season of 93 NE counties, at 169 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 48.1°F.

• Holt County: April 25 to October 13 (170 days, 12 WNV)
• Valley County: April 25 to October 12 (170 days, 5 WNV)
• Furnas County: April 26 to October 12 (169 days, 3 WNV)
• Logan County: April 26 to October 12 (169 days, 1 WNV)

West Nile in Greeley County

From 1999 to 2025, CDC ArboNET counted 12 human West Nile cases in Greeley County (2 neuroinvasive) across 3 years. The worst was 2003 with 8; the latest was 2014.

Background: when mosquitoes go away for the winter; how the dates are worked out.