Mosquito season in Baca County, CO: when it starts and ends
Mosquito months in Baca County
In a normal year mosquito season in Baca County, CO starts around April 24 and ends around October 19, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Baca County, and when
- Start tipping out standing water weekly by April 10.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 19.
- 3 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Baca County against the rest of CO
Baca County has the 10th longest season of 64 CO counties, at 178 days against 200 in Mesa County and 69 in Summit County. Its mean temperature is 52.9°F.
- Denver County: April 22 to October 18 (179 days, 189 WNV)
- Las Animas County: April 23 to October 18 (178 days, 2 WNV)
- Crowley County: April 23 to October 16 (176 days, 2 WNV)
- Kit Carson County: April 27 to October 19 (175 days, 7 WNV)
West Nile in Baca County
From 1999 to 2025, CDC ArboNET counted 12 human West Nile cases in Baca County (4 neuroinvasive) across 7 years. The worst was 2003 with 5; the latest was 2023.
See how the dates are worked out, and when the season starts across the US.