Mosquito season in Gilpin County, CO: when it starts and ends
Mosquito months in Gilpin County
In a normal year mosquito season in Gilpin County, CO starts around June 12 and ends around September 7, about 12 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Gilpin County, and when
- Start tipping out standing water weekly by May 29.
- Book any yard treatment for mid June, ahead of the July peak.
- Repellent can go away after September 7.
- No West Nile cases since 2016, so bites in Gilpin County are a nuisance; check window screens.
Gilpin County against the rest of CO
Gilpin County has the 59th longest season of 64 CO counties, at 87 days against 200 in Mesa County and 69 in Summit County. Its mean temperature is 36.8°F.
- Jackson County: June 8 to September 8 (92 days, 0 WNV)
- Chaffee County: June 9 to September 8 (91 days, 11 WNV)
- Gunnison County: June 14 to September 8 (86 days, 1 WNV)
- Park County: June 15 to September 8 (85 days, 0 WNV)
West Nile in Gilpin County
CDC ArboNET lists no human West Nile cases for Gilpin County from 1999 to 2025.
See how the dates are worked out, and when the season starts across the US.