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

Mosquito months in Dakota County

In a normal year mosquito season in Dakota County, NE starts around April 19 and ends around October 16, 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 Dakota County, and when

• Start tipping out standing water weekly by April 5.
• Book any yard treatment for mid April, ahead of the July peak.
• Repellent can go away after October 16.
• 3 West Nile cases since 2016 (last 2022): you should use repellent at dusk June to August, more so if over 60.

Dakota County against the rest of NE

Dakota County has the 44th longest season of 93 NE counties, at 180 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 48.4°F.

• Frontier County: April 21 to October 19 (181 days, 1 WNV)
• Red Willow County: April 21 to October 19 (181 days, 8 WNV)
• Phelps County: April 21 to October 18 (180 days, 5 WNV)
• Knox County: April 20 to October 16 (179 days, 10 WNV)

West Nile in Dakota County

From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Dakota County (2 neuroinvasive) across 7 years. The worst was 2013 with 2; the latest was 2022.

Background: when the season starts across the US; how the dates are worked out.