Frisco officials said Friday that one mosquito pool inside the city limits has tested positive for West Nile virus, and they are gearing up for targeted overnight spraying this weekend. Ground crews in spray trucks are slated to roll at about 9 p.m. Saturday and again Sunday night, weather and wind permitting. City staff added that there are no confirmed human cases in Frisco and urged residents to stick with basic bite-prevention habits.
Where And When Crews Will Spray
According to a news release from the City of Frisco, contractor crews will operate ground-spray trucks from about 9 p.m. Saturday, June 27 through 5 a.m. Sunday and on the same schedule Sunday night into Monday, as long as weather and wind cooperate. The city published a map flagging parts of Frisco Avalon, Frisco Avalon North, Frisco Springs and Meadow Hill Estates as treatment zones. Officials said the treatments will concentrate near the spot where the positive mosquito pool was collected. The advisory also went out on the city's X page.
One mosquito pool tested positive for West Nile Virus (WNV) this week. City to spray overnight, June 27 & 28, starting at 9 p.m. tomorrow night. Remember to 'wear, apply & remove' to protect against mosquito bites!
— City of Frisco,Texas (@CityOfFriscoTx) June 26, 2026
Weather and wind permitting, spraying will happen in parts of… pic.twitter.com/4mg0gf0QLS
Local Testing And State Data
"This makes three positive mosquito pools in Frisco this year," the city's release notes. The Texas Department of State Health Services latest arbovirus report lists Collin County among the counties reporting West Nile-positive mosquito pools this season. Health teams lean on trap results like these to decide where to focus adult mosquito control and larval treatment.
What Officials Recommend
The city urged residents to "wear, apply & remove" cover up at dawn and dusk, use repellents and drain standing water around homes a set of tips that mirrors federal guidance. The Centers for Disease Control and Prevention notes that most West Nile infections are mild or asymptomatic, though older adults and people with certain medical conditions face a higher risk of severe illness. Officials recommend EPA-registered repellents containing DEET, picaridin or oil of lemon eucalyptus, along with regular yard checks to eliminate mosquito breeding sites.
How Spraying Works And Safety Notes
The spraying will be applied as an ultra-low-volume mist designed to hit adult mosquitoes at night when they are most active. Federal guidance from the U.S. Environmental Protection Agency says EPA-registered adulticides are used at low concentrations and are considered safe when applied according to label directions. Residents are typically advised to close windows and bring pets indoors while trucks pass through. If anyone believes they were directly exposed to spray, public guidance recommends washing the affected skin with soap and water and contacting a health care provider if symptoms or concerns develop.
Regional Context
Similar positive traps and overnight treatments have been reported elsewhere in North Texas this month, as cities and counties ramp up mosquito surveillance and response. Local coverage has tracked recent truck-mounted applications in Mesquite and parts of Dallas, illustrating how trap results quickly translate to targeted spraying; see truck-mounted applications in Mesquite for one recent example. Statewide arbovirus snapshots from DSHS show pockets of activity this season, which public-health officials say is why targeted adulticide operations remain a standard tool alongside community prevention.
