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

Mosquito months in Red Willow County

In a normal year mosquito season in Red Willow County, NE starts around April 21 and ends around October 19, about 26 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 Red Willow County, and when

• Start tipping out standing water weekly by April 7.
• Book any yard treatment for late April, ahead of the July peak.
• Repellent can go away after October 19.
• 8 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.

Red Willow County against the rest of NE

Red Willow County has the 43rd longest season of 93 NE counties, at 181 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 51.6°F.

• Cuming County: April 19 to October 17 (182 days, 17 WNV)
• Frontier County: April 21 to October 19 (181 days, 1 WNV)
• Dakota County: April 19 to October 16 (180 days, 3 WNV)
• Phelps County: April 21 to October 18 (180 days, 5 WNV)

West Nile in Red Willow County

From 1999 to 2025, CDC ArboNET counted 52 human West Nile cases in Red Willow County (9 neuroinvasive) across 11 years. The worst was 2003 with 37; the latest was 2023.

Background: reading the West Nile counts; how the dates are worked out.