Local fly information

Fly control in Colorado

Learn what to look for around your property, explore your city, and ask about an inspection or a quote.

Flies in Colorado: what to know

Around Colorado

Conditions vary across the state. Choose your city below, then describe what’s happening around your home or business.

What to note

Where you see flies, how long it has been going on, and anything you’ve already tried are the most useful details to mention.

A useful next step

Ask about an inspection, what treatment would involve, and whether follow-up visits are included. You don’t need to identify the problem yourself before getting in touch.

Local research

Flies in Colorado: what the public record shows

Before you compare quotes, it helps to know which flies actually live in Colorado, when they are busiest, and what the state figures look like. Everything below links to the agency or university page it came from.

Cluster fly (Pollenia spp.), not the house fly

Most common fly in Colorado homes during cool months

Flies appearing indoors in fall and winter in Colorado are usually overwintering cluster flies from the lawn, not a sanitation problem.

Colorado State University Extension

Late August through September, as adults seek overwintering shelter

Cluster fly building entry timing

Exclusion work has to be finished before Labor Day to matter.

Colorado State University Extension

Parasites of earthworms in lawn soil

Cluster fly larval host

There is no garbage or drain source to clean up, so the fix is sealing the building, not sanitation.

Colorado State University Extension

Fly species recorded in Colorado

House fly (Musca domestica) — Non-biting; breeds in manure, garbage, lawn clippings, decaying produce. 45 days at 60°F to 7 days at 95°F. Carries bacteria and viruses causing diarrhea, cholera, food poisonin…

When flies are busiest in Colorado

Cluster flies enter buildings late August–September and reappear on warm winter days; fruit fly numbers peak late summer and early fall.

CSU Extension notes cluster flies are particularly abundant at higher elevations in Colorado; the house fly is not the most common indoor fly in the state.

For context, nationally

About 45 days at 60°F; 7 days at 95°F — House fly life cycle vs temperature. Texas A&M AgriLife Extension
75–150 per cluster; 350 to 900 in a lifetime — House fly eggs per female. University of New Hampshire Extension

Sources: Colorado State University Extension; Texas A&M AgriLife Extension; University of New Hampshire Extension; Flies (Home and Landscape). Figures are quoted as the source prints them. How we check our sources

Explore Colorado cities

Arvada

Semi-Arid · suburban setting

Fly control in Colorado

Flies in Colorado: what to know

Around Colorado

What to note

A useful next step

Flies in Colorado: what the public record shows

Fly species recorded in Colorado

When flies are busiest in Colorado

For context, nationally

Explore Colorado cities

Arvada

Aurora

Boulder

Broomfield

Castle Rock

Centennial

Colorado Springs

Denver

Fort Collins

Grand Junction

Greeley

Lakewood

Longmont

Loveland

Parker

Pueblo

Thornton

Westminster

Commerce City

Ask about fly control in Colorado