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

Mosquito months in Webster County

In a normal year mosquito season in Webster County, NE starts around April 22 and ends around October 16, about 25 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 Webster County, and when

• Start tipping out standing water weekly by April 8.
• Book any yard treatment for late April, ahead of the July peak.
• Repellent can go away after October 16.
• 2 West Nile cases since 2016 (last 2022): you should use repellent at dusk June to August, more so if over 60.

Webster County against the rest of NE

Webster County has the 55th longest season of 93 NE counties, at 177 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 51°F.

• Hayes County: April 22 to October 17 (178 days, 1 WNV)
• Keith County: April 22 to October 17 (178 days, 9 WNV)
• Boone County: April 22 to October 15 (176 days, 7 WNV)
• Cedar County: April 22 to October 15 (176 days, 4 WNV)

West Nile in Webster County

From 1999 to 2025, CDC ArboNET counted 21 human West Nile cases in Webster County (3 neuroinvasive) across 11 years. The worst was 2003 with 8; the latest was 2022.

See how the dates are worked out, and when the season starts across the US.