Mosquito season in Lincoln County, CO: when it starts and ends
Mosquito months in Lincoln County
In a normal year mosquito season in Lincoln County, CO starts around May 1 and ends around October 10, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lincoln County, and when
- Start tipping out standing water weekly by April 17.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 10.
- 2 West Nile cases since 2016 (last 2023): you should use repellent at dusk July to August, more so if over 60.
Lincoln County against the rest of CO
Lincoln County has the 26th longest season of 64 CO counties, at 162 days against 200 in Mesa County and 69 in Summit County. Its mean temperature is 48.9°F.
- Douglas County: May 1 to October 12 (164 days, 49 WNV)
- Phillips County: May 1 to October 12 (164 days, 3 WNV)
- Elbert County: May 2 to October 11 (162 days, 6 WNV)
- Adams County: May 2 to October 10 (161 days, 146 WNV)
West Nile in Lincoln County
From 1999 to 2025, CDC ArboNET counted 14 human West Nile cases in Lincoln County (6 neuroinvasive) across 4 years. The worst was 2003 with 8; the latest was 2023.
More: how the dates are worked out · when the season starts across the US.