Overnight mosquito spraying set after positive West Nile virus test

The City of Frisco confirmed that one mosquito pool tested positive for West Nile virus (WNV) this week. In response, the city’s third-party contractor will conduct ground spraying overnight starting at 11 p.m. on Saturday, October 31, through 5 a.m. on Sunday, November 1.

A second overnight spraying session is scheduled from 9 p.m. on Sunday, November 1, through 5 a.m. on Monday, November 2, weather permitting.

The spraying will target the following neighborhoods: Fairfield Estates, Lakes of Preston Vineyards, Parkside Estates, Plantation Estates, Preston Lakes, Preston Vineyards North, Shepherds Hill, and Stonebryck Manor. A map of the affected areas is available as a PDF on the city’s website. This is the 17th positive mosquito pool detected in Frisco this year.

The city notes that no human cases of WNV have been confirmed in Frisco in 2026.

Residents are urged to follow the “Wear, Apply and Remove” precautions promoted by the Texas Department of State Health Services (DSHS) to prevent mosquito bites.

These steps include wearing long sleeves and pants during dawn and dusk, using insect repellents containing DEET, picaridin, or oil of lemon eucalyptus, and removing standing water from bird baths, French drains, clogged gutters, saucers under potted plants, and splash blocks. Mosquitoes that carry WNV breed in stagnant water.

Frisco tests mosquito pools from May 1 through November 15 in accordance with its Mosquito Surveillance and Response Plan. Additional information on prevention and the city’s plan is available at FriscoTexas.gov/Mosquitoes. Residents can contact the City of Frisco’s Health & Food Safety Division at 972-292-5304 for more details.