Mosquito season in Bent County, CO: when it starts and ends
Mosquito months in Bent County
In a normal year mosquito season in Bent County, CO starts around April 18 and ends around October 21, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Bent County, and when
- Start tipping out standing water weekly by April 4.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 21.
- 3 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Bent County against the rest of CO
Bent County has the 2nd longest season of 64 CO counties, at 186 days against 200 in Mesa County and 69 in Summit County. Its mean temperature is 54.5°F.
- Mesa County: April 8 to October 25 (200 days, 29 WNV)
- Prowers County: April 18 to October 20 (185 days, 9 WNV)
- Kiowa County: April 19 to October 21 (185 days, 2 WNV)
West Nile in Bent County
From 1999 to 2025, CDC ArboNET counted 24 human West Nile cases in Bent County (8 neuroinvasive) across 8 years. The worst was 2003 with 7; the latest was 2025.
More: how the dates are worked out · when the season starts across the US.