View the West Nile Virus Risk Map to understand where testing indicates the presence of West Nile virus positive mosquitoes. The City of Fort Collins operates 53 traps throughout the community to provide up to date information on the severity of West Nile virus.
Updated weekly during the summer active breeding season
The City of Fort Collins has four separate zones for adulticiding (spraying). Before any spraying is considered, the vector index must be 0.75 in a zone and there must be more than one human case of West Nile in a week.
Zone NW = 0.112
Zone NE = 0.044
Zone SE = 0.014
Zone SW = 0
Week 29 charts
Weekly trapping and testing began the week of June 13, 2016 (Week 24)
See 2015 data
Total number of human cases in Fort Collins for the 2016 season as of July 23, 2016: – 1
As a data driven organization the City of Fort Collins is gathering information from the community about the level of awareness of West Nile Virus. Please take a moment to fill out the following poll in order to help use provide the community with better information on this disease.
Take the WNV Awareness Poll
Mosquitoes breed in water! Drain any standing water in your yard each week. Bird baths, clogged gutters and kiddie pools are common breeding sites.
Wear lightweight, long-sleeved shirts and long pants while outdoors. Spray clothing with insect repellent since mosquitoes may bite through clothing.
Apply insect repellent sparingly to exposed skin. Use an approved repellent according to its label. Find the repellent that is right for you.
Limit time spent outdoors at dusk through dawn, when mosquitoes are most active and feeding.
Take a moment to sign up for community alerts for West Nile virus (WNV) spraying at Larimer Emergency Telephone Authority (LETA911).
LETA911, is the Governing Authority for 9-1-1 in Larimer County Colorado. LETA911 provides oversight to 9-1-1, the equipment, and the programs funded by LETA. This includes non-emergency or community alerts for WNV adulticiding.
Create an account and under "My Alert Subscriptions" click "Community Alerts" and then check the "Fort Collins | Poudre Fire Authority" box and check "West Nile Virus Spraying" to receive alerts.
If you are a business or laboratory you can apply to opt out of our adulticiding (spraying operations). Please keep in mind only commercial businesses able to prove a long-term negative financial impact to their business will be considered. To apply, enter your business and contact information. Applicants will receive an application via email with the requirements and details of the opt-out.
Our mosquito contractor, Colorado Mosquito Control, has a NEW interactive mosquito surveillance and control map.
The City of Fort Collins developed a system, West Nile Notify, to send out emails in advance of our spraying operations. Simply subscribe by adding your email to our list. West Nile Notify allows citizens to be notified as early as possible to scheduled mosquito adulticiding. This service is free of charge and subscribers can choose to receive notifications on any or all of the six spraying areas. If you do not have an email address, please call the Colorado Mosquito Control at 970-962-2582.
The West Nile Virus Technical Advisory Committee meets to discuss the previous mosquito season and considers recommendations for future response guidelines. The committee is composed of City-appointed experts who provide technical expertise and make recommendations to City Council regarding the City’s West Nile Virus Management Policy. Visit their webpage for meeting minutes and to get notifications when new minutes are available.