Mosquito season in Kiowa County, CO: when it starts and ends

Mosquito months in Kiowa County

In a normal year mosquito season in Kiowa County, CO starts around April 19 and ends around October 21, 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 Kiowa 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 21.
• 2 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.

Kiowa County against the rest of CO

Kiowa County has the 4th longest season of 64 CO counties, at 185 days against 200 in Mesa County and 69 in Summit County. Its mean temperature is 52.7°F.

• Bent County: April 18 to October 21 (186 days, 3 WNV)
• Prowers County: April 18 to October 20 (185 days, 9 WNV)
• Broomfield County: April 20 to October 20 (183 days, 35 WNV)
• Pueblo County: April 19 to October 18 (182 days, 37 WNV)

West Nile in Kiowa County

From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Kiowa County (1 neuroinvasive) across 4 years. The worst was 2023 with 1; the latest was 2023.

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