Denton County's overnight mosquito-fogging campaign wraps up Wednesday night, Aug. 19, capping a week of truck-based spraying that started Thursday, Aug. 13. It's the sixth round of fogging this summer, and the season's pattern should concern Flower Mound and Highland Village residents: the virus keeps showing up closer to home.
The two positive mosquito traps that triggered this round were located north of Hwy 380 and east of Teel Parkway in the Artesia area, and south of Hackberry and west of Frisco, according to a Denton County Public Health press release dated Aug. 12. Crews are running ultra-low volume insecticide spraying between 9 p.m. and 5 a.m., weather permitting.
But the broader picture is what makes this personal for Flower Mound. The Argyle/Harvest corridor, directly adjacent to Flower Mound's western edge, has been a recurring hotspot all season, according to The Flower Mound Bee. A positive trap south of Argyle triggered fogging in late May. Another trap west of Argyle, in the northwestern portions of the Harvest community, brought a second round in late June. Unincorporated areas south of Argyle were fogged again July 16–22.
As we reported Aug. 12, the county ordered its fifth round near Artesia and south of Hackberry. This sixth campaign covers the same zones through tonight.
Two human cases confirmed
The county has confirmed two human West Nile cases in 2026. The first, announced July 10, was a Denton resident diagnosed with the non-neuroinvasive form. The second, announced July 30, was a resident of The Colony diagnosed with West Nile Neuroinvasive Disease, according to KERA News. That form can cause meningitis, encephalitis or acute flaccid myelitis. There is no vaccine and no specific treatment.
As of early August, the county had 31 positive mosquito pools confirmed this season, according to Texas DSHS data.
About 1 in 5 people infected develop any symptoms. Fewer than 1% reach the neuroinvasive form, but it can be severe.
County trucks don't cover Flower Mound streets
County fogging crews operate only in unincorporated areas. Flower Mound and Highland Village run their own protocols for what triggers ground spraying inside town limits. Mosquitoes, however, don't observe city boundaries.
What residents should do
In its Aug. 12 press release, Denton County Public Health advised residents to "defend yourself by using EPA-registered repellent. Check for ingredients like DEET, Picaridin, or Oil of Lemon Eucalyptus."
The department also recommends draining standing water in birdbaths, flowerpots and clogged gutters. For water that cannot be eliminated, BTI briquettes, sold as mosquito dunks, kill larvae without harming pets or wildlife.
August is historically one of the most active months for West Nile in North Texas. Mosquitoes are most active at dusk and dawn.
Detailed maps of current fogging zones and the interactive mosquito trap map are posted at DentonCounty.gov/WNV.
