Mosquito season in Crowley County, CO: when it starts and ends
Mosquito months in Crowley County
In a normal year mosquito season in Crowley County, CO starts around April 23 and ends around October 16, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Crowley County, and when
- Start tipping out standing water weekly by April 9.
- 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 2023): you should use repellent at dusk June to August, more so if over 60.
Crowley County against the rest of CO
Crowley County has the 11th longest season of 64 CO counties, at 176 days against 200 in Mesa County and 69 in Summit County. Its mean temperature is 52.1°F.
- Las Animas County: April 23 to October 18 (178 days, 2 WNV)
- Baca County: April 24 to October 19 (178 days, 3 WNV)
- Kit Carson County: April 27 to October 19 (175 days, 7 WNV)
- El Paso County: April 24 to October 15 (174 days, 66 WNV)
West Nile in Crowley County
From 1999 to 2025, CDC ArboNET counted 12 human West Nile cases in Crowley County (8 neuroinvasive) across 7 years. The worst was 2003 with 4; the latest was 2023.
See how the dates are worked out, and when the season starts across the US.