Western Montana Experts Reveal What To Expect This Mosquito Season

Spring in Montana means more time outside, but it also means the bugs are back. Tick season got an early start across Montana this year, and now another pest is going to be showing up in western Montana: mosquitoes. While they may seem like just another annoying summer bug, mosquitoes are considered the deadliest animal on the planet because of the diseases they can spread. 

Insights from the Lolo Mosquito District

I spoke with Clarissa Orton, an aquatic invasive species coordinator, and the Lolo Mosquito District coordinator to get a mosquito forecast for western Montana heading into summer 2026. 

Weather Impacts on Mosquito Populations

According to Orton, mosquito season is shaping up similarly to last year. The biggest factor helping keep mosquito numbers down so far has been the lack of moisture this winter and spring. Western Montana has not seen widespread flooding or prolonged high water conditions, which is good news when it comes to mosquito populations. 

READ MORE:  Tick Season Is Already Starting in Western Montana

Mosquitoes rely heavily on standing water to breed, so fewer flooded areas usually mean fewer mosquitoes. However, Orton says conditions could still change depending on spring rainfall and snowmelt. If Montana sees wetter weather patterns or localized flooding later this spring, mosquito activity could increase quickly. 

Right now, long-range forecasts calling for a drier-than-normal summer across much of Montana could help keep mosquito numbers more manageable throughout the season. 

Mosquitoes aren't just a nuisance for humans. They can also pose serious health risks to pets. Many dog owners may not realize mosquitoes can spread heartworm disease between animals through bites, according to the American Veterinary Medical Association. Veterinarians often recommend preventative medications during mosquito season to help protect pets. 

Top Tips to Reduce Mosquito Breeding Around Your Home

There are several simple ways Montanans can help reduce mosquitoes around their homes: 

• Eliminate standing water whenever possible. 
• Change the bird bath water frequently.
• Empty kiddie pools when not in use.   
• Watch for puddles or water collecting around the property.  
• Keep gutters and drainage areas clear.  

There are plenty of mosquito prevention products available, including sprays, wearable repellents, citronella candles, and electronic repellent devices. 

Looking Ahead: What to Expect for Mosquitoes in 2026

For now, the 2026 mosquito forecast in western Montana is looking fairly mild, but as always in Montana, weather conditions over the next several weeks could quickly change the outlook.