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

Mosquito months in Frontier County

In a normal year mosquito season in Frontier 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 Frontier 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.
• 1 West Nile case since 2016 (last 2016): you should use repellent at dusk June to August, more so if over 60.

Frontier County against the rest of NE

Frontier County has the 42nd longest season of 93 NE counties, at 181 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 51.1°F.

• Buffalo County: April 19 to October 18 (182 days, 22 WNV)
• Cuming County: April 19 to October 17 (182 days, 17 WNV)
• Red Willow County: April 21 to October 19 (181 days, 8 WNV)
• Dakota County: April 19 to October 16 (180 days, 3 WNV)

West Nile in Frontier County

From 1999 to 2025, CDC ArboNET counted 11 human West Nile cases in Frontier County (1 neuroinvasive) across 5 years. The worst was 2003 with 7; the latest was 2016.

More: how the dates are worked out · when mosquitoes go away for the winter.