The Fogging Trucks Are Back — and This Time They're Working the Northwestern Harvest Area

If you live in the northwestern part of Harvest — the unincorporated stretch west of Argyle — the county's fogging trucks have been running through your neighborhood all week. Tonight, Friday, is the final pass.

On June 18, Denton County Public Health reported one positive West Nile Virus mosquito trap in unincorporated Denton County, located in the area west of Argyle in the northwestern portions of Harvest. That's what triggered everything. DCPH responded by scheduling three rounds of fogging beginning Saturday, June 20, running through tonight, Friday, June 26 — weather permitting — with trucks operating between 9 p.m. and 5 a.m. The trap sits near the intersection of Cleveland-Gibbs Road and Old Justin Road. Not a vague "area near Argyle." Your road, your yard, your dog.

The timing isn't random. Late night through early morning is when mosquitoes are most active, and when most people are least likely to be outside. "Least likely" isn't the same as "inside." Night-shift workers, early risers walking the dog at 4:45 a.m., anyone sleeping with windows open on a June night — this affects you directly.

The spray is applied as ultra-low volume fog, with droplets that stay aloft and kill flying mosquitoes on contact. ULV applications involve less than 3 ounces of pesticide active ingredient per acre, which minimizes exposure to people and the environment. The county isn't guessing at the chemistry — adulticides used for public health mosquito control can be used without posing unreasonable risks to the general population when applied per label. If you have respiratory sensitivities, closing windows before 9 p.m. tonight is the obvious move.

This is also not the first positive trap in the county this season. The Harvest trap was the third positive West Nile virus trap reported in Denton County for the 2026 mosquito season. The county had already fogged south of Argyle after a separate positive trap in late May. The pattern this summer is real.

For tonight: close windows before dark, bring pets in, and skip the late-evening patio plans if you're in that corridor. Detailed maps of the fog areas are posted on the DCPH West Nile Virus website at DentonCounty.gov/WNV. The county also advises draining standing water from bird baths, flowerpots, and clogged gutters; using BTI briquettes (mosquito dunks) in water that can't be drained; and wearing long sleeves and pants — with repellent on thin clothing — when you're outside.

After tonight, the fogging is done for this round. But the traps are still running. If your neighborhood gets a positive result, you'll want to be signed up for Denton County's emergency alerts before the trucks arrive — not after.