Mosquito season in Hinsdale County, CO: when it starts and ends
Mosquito months in Hinsdale County
In a normal year mosquito season in Hinsdale County, CO starts around June 8 and ends around September 12, about 14 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Hinsdale County, and when
- Start tipping out standing water weekly by May 25.
- Book any yard treatment for early June, ahead of the July peak.
- Repellent can go away after September 12.
- No West Nile cases since 2016, so bites in Hinsdale County are a nuisance; check window screens.
Hinsdale County against the rest of CO
Hinsdale County has the 55th longest season of 64 CO counties, at 96 days against 200 in Mesa County and 69 in Summit County. Its mean temperature is 36.1°F.
- Clear Creek County: June 7 to September 14 (99 days, 2 WNV)
- Mineral County: June 10 to September 16 (98 days, 0 WNV)
- San Miguel County: June 15 to September 16 (93 days, 2 WNV)
- Jackson County: June 8 to September 8 (92 days, 0 WNV)
West Nile in Hinsdale County
CDC ArboNET lists no human West Nile cases for Hinsdale County from 1999 to 2025.
See how the dates are worked out, and when mosquitoes go away for the winter.