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Mosquito spraying in northeast Fort Collins rescheduled to Aug. 29 & Sept. 1

Released on Friday, August 27, 2021

Due to high winds and rain, the mosquito spraying scheduled for northeast Fort Collins on Thursday, Aug. 26 was canceled. Spraying will now occur by fogging trucks on both Sunday, Aug. 29 and Wednesday, Sept. 1, weather permitting.

The decision to spray is based on high levels of West Nile virus infected Culex mosquitoes trapped last week. Spraying will begin at approximately 8 p.m. each night and end by approximately 2 a.m. the following morning.

Spraying will take place in the areas generally bounded by:

  • Douglas Road, I-25, Mulberry Street, Riverside Avenue and College Avenue, as well as
  • The area east of I-25 to County Road 5, between Mulberry Street and County Road 48, and
  • The residential areas immediately west of College Avenue between Hickory Street and Highway 1

Please see the detailed map of the spray area at and attached. The entire spray area will be treated on both nights.

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 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.