Mosquito season in Kit Carson County, CO: when it starts and ends
Mosquito months in Kit Carson County
In a normal year mosquito season in Kit Carson County, CO starts around April 27 and ends around October 19, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Kit Carson County, and when
- Start tipping out standing water weekly by April 13.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 19.
- 7 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to August, more so if over 60.
Kit Carson County against the rest of CO
Kit Carson County has the 12th longest season of 64 CO counties, at 175 days against 200 in Mesa County and 69 in Summit County. Its mean temperature is 51.4°F.
- Baca County: April 24 to October 19 (178 days, 3 WNV)
- Crowley County: April 23 to October 16 (176 days, 2 WNV)
- El Paso County: April 24 to October 15 (174 days, 66 WNV)
- Delta County: April 25 to October 16 (174 days, 111 WNV)
West Nile in Kit Carson County
From 1999 to 2025, CDC ArboNET counted 16 human West Nile cases in Kit Carson County (3 neuroinvasive) across 8 years. The worst was 2003 with 5; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.