Changes to Mosquito Spray Notifications
Starting in 2024, spray notifications will no longer include phone calls. To ensure you receive notification for any future spraying, please text FCWNV to 888-777 or sign up for email alerts at nocoalert.org.
Spray zone map for Aug. 21, 2025
City to spray for mosquitoes in west Fort Collins Aug. 21
Based on high levels of West Nile virus infected Culex mosquitoes trapped last week, the City of Fort Collins will spray for mosquitoes in west Fort Collins.
Spraying will occur by fogging trucks on Thursday, Aug. 21 weather permitting; it will begin at dusk and end by approximately 2 a.m. the following morning.
Spraying will take place in the area from:
- Overland Trail to Shields Street, between Laporte Avenue and Trilby Road
The City’s contractor, Vector Disease Control International (VDCI), will use a permethrin-based product to be applied in a fine mist. To minimize pesticide exposure, residents should stay indoors and keep doors and windows closed for 30 to 60 minutes after spraying. It’s recommended that residents bring pets indoors as well. Residents can further minimize pesticide exposure by covering organic gardens, ponds, and water features with a sheet or tarp.
The City consults with the Parks & Recreation departments, Poudre School District, and Colorado State University on any scheduled outdoor events within the spray zone, and will adjust schedules to spray in those areas later in the evening, after events have concluded.
The decision to spray for mosquitos follows the recommendation by the Larimer County Department of Health and Environment, in accordance with the City’s West Nile Virus Management Policy.
- View map of spray area
- Follow the fogging trucks' progress online (zoom in on map during spray hours to view truck paths; routes will be visible for 24 hours after each spray application)
West Nile Virus Information
West Nile virus is a disease that is transmitted to humans by mosquitoes. The symptoms of West Nile virus range from none to very serious.
Protect Yourself
Help protect yourself from mosquitoes and West Nile virus with the Four D's! Report possible mosquito breeding sites, and learn the best ways to prevent mosquito breeding at home.
Mosquito Spraying
Sign up to receive alerts if the City decides to spray for mosquitoes, and learn more about the spray process.
Local Data
View the weekly vector index and trap reports during the summer testing season, as well as monthly and annual program reports.
Technical Advisory Committee
The Technical Advisory Committee is comprised of community experts who provide technical expertise and recommendations to City Council regarding the City's West Nile virus policy.
City's West Nile Virus Management
Review the City's West Nile Virus Management Policy and Response Plan. The City has contracted with Vector Disease Control International to conduct mosquito surveillance and mitigation.