​Colorado summers are too good to spend swatting mosquitoes off your arms every time you step onto the patio.

But as we head into the heart of mosquito season, there’s a timely reminder for homeowners along the Front Range: West Nile virus has been confirmed in Colorado for 2026.

According to Colorado Public Radio, the state’s first human West Nile case of the year was reported in Jefferson County in early June. Later that month, Larimer County confirmed its first reported human case of 2026. Larimer County noted that the resident may have acquired the virus while traveling out of state, but local health officials also reminded residents that West Nile is likely circulating in mosquito populations every summer.

That doesn’t mean it’s time to panic. It does mean it’s time to be practical.

larimer county family enjoying dinner without mosquito bites

So far in 2026, Colorado has reported one human West Nile case in Jefferson County and one in Larimer County. Last year, Colorado reported 286 confirmed West Nile cases statewide. Locally, that included 53 cases in Larimer County, 38 in Boulder County, and 26 in Denver County. For a full county-by-county breakdown, homeowners can visit the Colorado Department of Public Health and Environment’s West Nile virus data page.

Why Colorado Is Watching Mosquitoes Closely This Year

A recent CPR report noted that mosquito activity was reported early this year, with some reports dating back to March after Colorado’s low-snow winter. Health officials also pointed out that early mosquito activity does not automatically mean a worse-than-usual West Nile season.

The tricky part is that West Nile virus activity depends on several factors, including rainfall, temperature, the birds that carry it, and the mosquitoes that spread it. Colorado has the right mix of all of those, especially along the Front Range.

The mosquito most associated with West Nile in Colorado typically becomes most active from late June through the first frost. West Nile activity usually peaks in July and August, which is exactly when many of us are spending more evenings outside.

Where EnviroPest Can Help

West Nile virus spreads to people through mosquito bites from infected mosquitoes, so reducing mosquito activity around your home matters, especially during peak season.

That’s where EnviroPest’s mosquito control service comes in.

Our technicians treat common adult mosquito resting areas around the property, including tall grass and shaded areas, as well as shrubs and bushes around homes. We also treat certain water features with larvicide to prevent mosquito larvae from developing into biting adults.

Treatments are typically performed monthly from May through September and are designed to drastically reduce mosquito activity for up to 30 days.

This seasonal service also targets ticks, too.

EnviroPest serves homeowners in Loveland, Fort Collins, and throughout northern Colorado, as well as the Denver and Boulder areas, and the Colorado Springs metro. View our local service areas here.

No mosquito service can eliminate every mosquito or guarantee disease prevention. But professional mosquito control can be an important part of a practical summer plan, especially during the months when West Nile risk is highest.

Enjoy Your Yard With Fewer Mosquitoes

West Nile virus has been confirmed in Colorado this year, and mosquito season is just getting into its busiest stretch. If your family spends summer evenings on the patio, hosts backyard cookouts, gardens, plays outside, or simply wants to enjoy the yard without constant bites, now is a good time to get ahead of mosquitoes.

EnviroPest has been helping Colorado homeowners manage pest problems for 60 years. This summer, a seasonal mosquito control plan can help make your outdoor spaces more comfortable and give you one more layer of protection during West Nile season.

Ready to enjoy your backyard again? Contact EnviroPest today to sign up for mosquito and tick control or request a free estimate.