North Texas Has a 9-Month Mosquito Season
If you live in the Dallas-Fort Worth Metroplex, mosquito season isn't a summer problem—it's a March through November reality. That's 9 months of active mosquito populations, compared to 4–5 months in northern states.
Understanding the seasonal pattern helps you time prevention and treatment for maximum effect. Here's what to expect month by month.
Month-by-Month Mosquito Activity in DFW
March–April: The Wake-Up
When nighttime temperatures consistently stay above 50°F, overwintering mosquito eggs begin hatching. Asian tiger mosquito eggs that survived winter in dry containers along fence lines and gutters hatch with the first spring rains.
What to do: Start your weekly standing water audit. This is the best time to begin professional treatment—you'll suppress the first generation before they multiply.
May–June: The Ramp-Up
Temperatures consistently above 80°F accelerate the mosquito lifecycle to just 7–10 days. Spring rains create abundant breeding habitat. Asian tiger mosquitoes and house mosquitoes are now both active in high numbers.
What to do: Professional barrier spray should be on a monthly schedule by now. Keep up with the standing water audit weekly.
July–September: Peak Season
This is the worst stretch. DFW's combination of 95°F+ heat and afternoon thunderstorms creates perfect conditions. Every storm creates temporary pools that hatch floodwater mosquitoes within 7 days. This is also when West Nile virus transmission peaks—Dallas County typically reports its first human cases in July.
What to do: Monthly professional treatment is essential. Recheck standing water within 24 hours of any rainfall. Apply EPA-registered repellent for any outdoor evening activity.
October–November: The Wind-Down
Mosquito populations decline as temperatures drop below 80°F, but don't let your guard down. Asian tiger mosquitoes remain active into November during warm years, and house mosquitoes move indoors seeking warmth.
What to do: Continue treatment through October. Final treatment in November targets adults before they lay overwintering eggs.
December–February: Dormant (Mostly)
Most species are dormant. However, warm spells above 50°F can briefly activate house mosquitoes. Aedes eggs sit dormant in containers, waiting for spring rain.
What to do: Clean out containers, clear gutters, and prep for spring. This is the cheapest time to fix drainage issues.
DFW's Biggest Mosquito Risk: West Nile Virus
Dallas County has recorded more West Nile virus cases than almost any other county in the United States. The 2012 outbreak saw 398 cases and 19 deaths in Dallas County alone—the largest West Nile outbreak ever recorded in a single U.S. county.
West Nile is transmitted by the Southern house mosquito (Culex quinquefasciatus), which breeds in storm drains, ditches, and polluted water throughout the Metroplex. Peak transmission runs from July through October.
When to Start Professional Treatment
The biggest mistake DFW homeowners make is waiting until they're getting bitten to start treatment. By then, you're fighting an established population that's been breeding on your property for weeks.
Start treatment in March or April—before the first generation of adults emerges. Maintaining monthly treatments through October provides season-long protection. Ongoing bi-monthly or quarterly visits average $129 to $149 a treatment, with free reservicing between visits if needed.
Check out our complete mosquito control guide for prevention strategies, or request a quote for your DFW property.