Learn more about mosquitoes that carry West Nile Virus and receive resources, such as repellent wipes, to help defend you and your family.
The CSU Lagoon Series on Wednesday, August 2 from 6 to 8:30 p.m.
The City of Fort Collins tracks measures (in four separate zones) to assist in the determination to spray for adult mosquitoes. Before spraying is considered, more than one human case per week must be reported within the City of Fort Collins, OR more than one positive human blood donor sample must be received during the season.
Additionally, one of the following three criteria must be met; increasing or above historical average populations, infection rates of greater than 3.0 per thousand, or a vector index of at least 0.75 in a zone.
Information updated July 17, 2017
INFECTION RATE per thousand:
NW Zone: 0.00
NE Zone: 1.57
SE Zone: 0.79
SW Zone: 0.00
NW Zone: 0.00
NE Zone: 0.004
SE Zone: 0.203
SW Zone: 0.00
Weekly trapping and testing will end the week of September 9, 2017 (Week 36)
Human Cases within the City of Fort Collins as of July 3, 2017: 0
Trap Reports are updated weekly. These reports show the total number of mosquitoes trapped during the previous week at 53 trapping sites throughout the city. Typically non-WNv carrying Aedes (known as floodwater mosquitoes) species mosquitoes comprise the majority of June counts, with Culex (WNv carrying) mosquitoes accounting for higher counts in July - August.
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.
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
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.
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 Vector Disease Control International at 970-962-2582.
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.
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.
Our mosquito control contractor, Vector Disease Control International, has a NEW interactive mosquito surveillance and control map.