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City to spray for mosquitoes in southwest Fort Collins Aug. 27

Released on Tuesday, August 22, 2023


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    Map of spray zone

Based on high levels of West Nile virus infected Culex mosquitoes trapped last week, the City of Fort Collins will spray for mosquitoes in southwest Fort Collins.

Spraying will occur by fogging trucks on Sunday, Aug. 27 weather permitting; it will begin at approximately 8 p.m. and end by approximately 2 a.m. the following morning.

Spraying will take place in the area generally bounded by:

  • Taft Hill Road, Horsetooth Road, College Avenue, and Carpenter Road/Spring Mesa Road

Please see the map of the spray area at and attached.

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. Fogging trucks are equipped with GPS tracking; to follow the trucks’ progress, visit

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.