Fort Bend County Mosquito Spraying Guide: Who Sprays Where (2026)

Fort Bend County had one of its worst mosquito years in 2026. After weeks of rain, the county declared a public health emergency in June and sprayed from the air. Through all of it, the question we heard most on the phone was a simple one: “Who is supposed to be spraying my street?”

The answer depends on where you live. Some cities run their own trucks on a weekly schedule. Others don’t spray at all and leave it to the county. And the county doesn’t spray on request. This guide lays out who sprays where in Fort Bend County, how each program works, what happened in 2026 and who to call.

Fort Bend County doesn’t spray on a set schedule or on request. It sprays where its traps find high mosquito numbers or disease, mostly in unincorporated areas. Inside city limits, the city is usually in charge: Rosenberg sprays weekly in peak season, Richmond sprays twice a week, Sugar Land and Missouri City spray once a week, and Fulshear doesn’t run its own spraying. No public program treats private yards. Report heavy mosquito activity to Fort Bend County Mosquito Control at 281-238-3001.

Does Fort Bend County spray for mosquitoes?

Yes, but not the way most people expect. Fort Bend County Health and Human Services runs an Integrated Mosquito Management program through its Environmental Health Division. The county maintains more than 90 trap sites where mosquitoes are counted, identified and tested for diseases such as West Nile virus, according to county statements reported by Covering Katy.

Spraying is the last step, not the first. The county sprays where surveillance finds unusually high numbers or mosquitoes that test positive for disease. It does not spray on request or on a fixed schedule, and a complaint doesn’t automatically bring a truck. Complaints still matter: they can lead inspectors to check an area or add traps.

It’s also worth knowing that Texas law doesn’t require cities or counties to control mosquitoes, as Community Impact noted in its coverage of Sugar Land’s program. Every program below is a local choice.

Who sprays where in Fort Bend County?

Here’s how public spraying works across the areas we serve, as of October 2026. Cities update their schedules each season, so check the city’s page before you plan around it.

Not sure if you’re inside city limits? Your mailing address won’t tell you. Our guide to Rosenberg city limits and the ETJ shows how to check with the city’s boundary map or your tax record.

How each city’s program works

Rosenberg

The City of Rosenberg sprays within city limits weekly during peak mosquito season. The program doesn’t include alleys or private property such as apartment complexes and mobile home parks, and the city tells residents not to rely on its spraying alone. For the current schedule, call Citizen Relations at 832-595-3301.

Richmond

The City of Richmond sprays inside city limits at dusk on Wednesdays and Saturdays. In 2026, spraying began on May 6, and the city announced the same schedule through Saturday, October 31. If you live in a Richmond-address neighborhood outside city limits, such as Pecan Grove, the county program applies instead. Our Richmond and Pecan Grove pages cover local mosquito conditions in more detail.

Sugar Land

Sugar Land runs one of the most studied programs in the county. In May and June 2025, the city ran a nine-week study across six spray zones. Community Impact reported that zones with no spraying had fewer mosquitoes per trap on average than zones sprayed once or twice a week. City staff pointed to possible reasons, including high starting populations, fast replacement, mosquitoes moving in from nearby and pesticide resistance.

On February 24, 2026, City Council agreed to cut routine spraying from twice a week to once, with extra sprays in zones where mosquitoes test positive. Spraying runs on Friday nights from May through October, weather permitting. After a confirmed human West Nile case in its Zone 4, the city added a Tuesday spray cycle there in July 2026, along with larvicide treatments in storm inlets, manholes and drainage ditches. More on local conditions on our Sugar Land page.

Missouri City

Missouri City describes its mosquito program as a resident-requested service. According to the city’s mosquito spraying FAQ, its contractor sprays on Thursday nights from 9 p.m. to 5 a.m., from May through the first week of November. Check the city’s page for any changes before relying on that schedule.

Fulshear

The City of Fulshear doesn’t run its own adult mosquito spraying. Its mosquito prevention program uses larvicide dunks and habitat for natural mosquito predators such as purple martins and bats, and the city works with Fort Bend County to monitor and test mosquitoes. If testing finds disease, the city coordinates with the county on spraying. Some Fulshear HOAs hire their own contractors. See our Fulshear page for more.

Katy

The City of Katy’s Public Works department sprays Monday through Thursday so each part of the city is covered once a week, generally from May through October. Katy-address neighborhoods outside city limits on the Fort Bend side fall under the county program.

Unincorporated Fort Bend County

If you live outside any city’s limits, including Rosenberg’s ETJ, Pecan Grove and many master-planned communities, the county program is the public one. The county treats based on its trap and testing data, and its mosquito page notes that it sprays inside a city only when that city has no way to spray on its own.

What happened in the 2026 mosquito season?

2026 was an unusual year. Here’s the timeline, from county statements reported by Community Impact and Click2Houston:

• May 1 to June 2: The county logged 1,505 mosquito complaints, more than twice the number after Hurricane Beryl in 2024.
• June 16: County Judge Daniel Wong declared a local public health emergency due to extraordinary mosquito populations.
• June 22 to 24: The county sprayed from the air around sunset, using an EPA-registered product called Dibrom Concentrate.
• Early July: The county confirmed its first 2026 human case of neuroinvasive West Nile virus, in a patient in ZIP code 77478, and 36 mosquito samples that tested positive.
• July 22: The county reported that trap counts fell from 109,536 before treatment to 18,711 after, an 83% drop. Twelve of the 15 treatment areas saw drops of more than 75%, and one area saw an increase.

County health director Dr. Letosha Gale-Lowe cautioned at the time that mosquito season wasn’t over. The aerial spraying knocked numbers down, but it didn’t stop new mosquitoes from hatching in standing water afterward.

How do you request mosquito spraying or report a problem?

You can’t order a spray, but you can make sure the right people know.

1. Inside a city with its own program, contact that city first. In Rosenberg, call Citizen Relations at 832-595-3301.
2. Everywhere else, report heavy mosquito activity to Fort Bend County Mosquito Control at 281-238-3001 or EH-MosquitoControl@fbctx.gov, or use the county’s online mosquito report form, linked from its Mosquito Control page.
3. For a neglected property or standing water next door, the city handles it inside city limits, and Fort Bend County Environmental Health (281-342-7469) handles it outside them.
4. For a pond, ditch or detention basin that’s breeding mosquitoes, tell the HOA or MUD that maintains it. Our guide to retention ponds and mosquitoes explains what to look for.
5. For West Nile virus questions, call Fort Bend County Health and Human Services at 281-238-3233.

What spraying doesn’t do

Truck and aerial spraying kill adult mosquitoes that are flying when the spray drifts by. It doesn’t empty the bucket behind your fence, clean your gutters or reach the shady shrubs where mosquitoes rest during the day. It’s also not designed to cover private property.

That matters because the mosquito most people notice in Fort Bend County, the black-and-white Asian tiger mosquito, breeds in small containers and doesn’t fly far. The mosquitoes biting you in the afternoon usually come from your yard or the one next door.

Every program in this guide asks residents to do the same few things, following the Texas Department of State Health Services’ “Four Ds”:

• Drain standing water every week: buckets, plant saucers, toys, tarps, birdbaths and clogged gutters.
• Dress in long sleeves and pants when mosquitoes are out.
• Defend with an EPA-registered repellent such as DEET, picaridin or oil of lemon eucalyptus, used as the label directs.
• Dusk and dawn are peak biting times for many mosquitoes, so limit time outside then.

If that isn’t enough, our mosquito control service treats the places public spraying can’t reach: the resting spots and breeding sites in your own yard. After a big storm, our guide to Rosenberg flood zones and pests covers what to expect, and the Rosenberg pest calendar shows when mosquito season peaks.

FAQ’s

Does Fort Bend County have a mosquito spraying schedule?

No. Fort Bend County sprays based on its trap counts and disease testing, not on a fixed schedule. Cities with their own programs, such as Rosenberg, Richmond, Sugar Land, Missouri City and Katy, do run regular schedules during mosquito season.

Can I request mosquito spraying in Fort Bend County?

You can report mosquito activity, but the county doesn’t spray on request. Call Fort Bend County Mosquito Control at 281-238-3001 or use its online form. Reports can lead the county to inspect or set traps in your area.

When does mosquito spraying happen in Rosenberg?

The City of Rosenberg sprays within city limits weekly during peak mosquito season. For the current day and time, call Citizen Relations at 832-595-3301.

Does Fulshear spray for mosquitoes?

The City of Fulshear doesn’t run its own adult mosquito spraying. It uses larvicide and natural predators, works with Fort Bend County on testing, and coordinates with the county if disease is found. Some HOAs hire private contractors.

What did Fort Bend County spray from the air in 2026?

Dibrom Concentrate, an EPA-registered mosquito control product, applied by aircraft June 22 to 24, 2026, after the county’s public health emergency declaration. The county reported an 83% drop in mosquito activity afterward.

Does mosquito spraying work?

It lowers adult mosquito numbers for a short time, as the county’s 2026 results showed. But Sugar Land’s 2025 study found that routine weekly spraying didn’t reduce mosquitoes per trap, which is why the city cut back. Removing standing water close to home makes the biggest difference.

Does city spraying cover my backyard?

No. City and county spraying runs along streets or from the air. Rosenberg’s program specifically excludes alleys and private property such as apartment complexes and mobile home parks.

Tired of waiting for the truck?

We treat yards across Rosenberg and the rest of our service area, on our schedule, not the spray truck’s. Call (281) 549-0821 24/7 for a free inspection. We’ll find where mosquitoes are breeding and resting around your home and give you a written price before any work starts. Or learn more about our pest control in Rosenberg.