Home/Fly Control/Colorado Springs, CO

Fly Control in Colorado Springs, CO

Two things about this city work in your favor when flies show up. The air is dry, with about 16 inches of moisture a year, so almost nothing stays wet unless somebody keeps it wet. And summers are cool by fly standards, with highs averaging 84F, so populations build more slowly than they do at lower and hotter elevations. Together that means a fly problem here has a short list of possible causes and a little more time to solve them. This page covers how to identify what you have, which damp spot it is using, and how to tell a plan that removes that material from one that only sprays adults.

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Quick answer

Colorado Springs sits at about 6,035 feet in dry air, so flies here breed only where water is applied: irrigated turf with clippings on it, a hosed pet run, compost, a container, a drain, or a leaking line. Identify the species first, because drain flies, phorid flies, house flies and blow flies each use a different material.

Key Takeaways

→Cluster flies in Colorado Springs are a late-summer sealing and treatment project, not a winter one.
→Every fly problem in Colorado Springs traces back to a breeding site, and finding it is the job.
→Sprays and ribbons in a Colorado Springs home kill adults only; the larvae keep coming.
→A sudden burst of shiny flies in a Colorado Springs house usually means a dead animal in a void.
→For Colorado Springs readers, one number to remember: The ordinary house fly is not as universal indoors as its name suggests: Bertone and colleagues found house or stable flies in 44% of 50 North Carolina homes in 2012, a small-sample presence figure and not a national rate.
→For Colorado Springs readers, one number to remember: the ordinary house fly is not as universal indoors as its name suggests: Bertone and colleagues found house or stable flies in 44% of 50 North Carolina homes in 2012, a small-sample presence figure and not a national rate.

Who This Is For

For Colorado Springs homeowners with irrigated yards, renters in complexes with shared trash enclosures, landlords with a repeat complaint, and small food operations losing to a floor drain. If you have treated for adults more than once and the numbers keep resetting, the wet material behind the problem has not been located yet.

82%

NC homes with phorid flies (Bertone et al., 50-home study, 2012)

Source: Bertone et al.: arthropods inside Raleigh-area homes

42%

NJ low-income apartments with trapped nuisance pests (Wang et al., 2018–19)

Source: Wang et al.: nuisance arthropods in New Jersey apartments

57%

U.S. respondents using store-bought pest products (ConsumerAffairs, 2024)

Source: ConsumerAffairs household infestation survey

About 45 days egg to adult

House fly development at 60F

Source: Texas A and M AgriLife Extension

About 7 days egg to adult

House fly development at 95F

Source: Texas A and M AgriLife Extension

350 to 900

Lifetime eggs per female house fly

Source: University of New Hampshire Extension

3 to 7 days

House fly larval stage

Source: University of New Hampshire Extension

As little as 7 days

Blow fly egg to adult

Source: University of California IPM

The Problem

Fly larvae need moist organic matter, and at 6,035 feet with humidity near 51 percent the atmosphere provides none of it. What that leaves is applied water: irrigated turf holding a pile of clippings, a hosed dog run, a compost heap on a watered zone, the residue inside a container, and any leak. Temperature is the second half of the picture. Texas A and M AgriLife Extension puts house fly development at about 45 days at 60F and about seven days at 95F, and with summer highs averaging 84F and cool nights at this elevation, the real pace sits between those two numbers. That is why fly problems here tend to creep up over several weeks instead of exploding after one hot weekend. Indoors, none of that applies: a drain stays wet all year, and phorid flies will use soil soaked by a cracked line under a slab in any month.

Warning Signs

•flies concentrate around the irrigated part of the yard and the trash area.
•The count returns to normal within two or three days of any treatment.
•Small fuzzy flies rest without moving on tile near a shower or floor drain.
•Tiny flies run in short bursts across a counter before they fly.
•Maggots in the residue inside a container or in a wet pile of clippings.
•Metallic blue or green flies collect at one window indoors.
•flies keep appearing in winter, when the yard is frozen and dormant.

Risks of Waiting

⚠The May to October window is short, so weeks lost are hard to recover.
⚠House flies move bacteria from waste onto counters, dishes, and food.
⚠A carcass in a wall keeps producing blow flies until the material dries.
⚠Phorid flies indoors usually mean a leak that is also wetting the slab.
⚠Repeated adult sprays add cost with no change to the underlying source.

✅

Do You Have a fly Problem?

Have you seen the pest or its droppings indoors?Is the activity getting worse week over week?Have you found damage, bites, or nests?Have DIY products failed to solve it?

Treatment Options

Source Inspection and Fly Identification

Typical published range: $75–$200

Blow flies in a Colorado Springs home often mean a dead rodent or bird in a wall or attic, so the inspector may probe voids. Fruit and drain flies point toward moisture and residue.

45–90 minutesBest: Every job; the species points to the breeding site

Sanitation, Source Removal and Drain Bio-Cleaning

Typical published range: $100–$350

Once the source is found, a Colorado Springs technician removes or treats it: spoiled material bagged and taken out, pet waste cleared, bins cleaned and drains scrubbed. Without this step, flies return within days.

1–3 hoursBest: House flies, drain flies, fruit flies; the fix that lasts

Cluster-Fly Void Treatment, Sealing and Follow-Up Monitoring

Typical published range: $150–$500; follow-ups $50–$150

For flies already inside a Colorado Springs attic or void, a pro may apply a dust or aerosol into the space and vacuum the sluggish adults. Spring emergence is then much lighter.

1–3 hours, plus scheduled checksBest: Cluster flies each fall; ongoing checks for commercial sites

Exclusion: Screens, Door Sweeps and Air Curtains

Typical published range: $150–$600 (air curtains more)

A pro in Colorado Springs will check that dumpster lids close, that enclosures have doors and that bins sit away from the building. Distance between waste and doorway is a real control.

1–4 hoursBest: Buildings with steady fly entry from outside

Flesh fly, Sarcophaga, with striped thorax

The short list of damp places in a dry city

An outdoor fly search in Colorado Springs is really a water search, and there are only so many candidates on a typical property. Start with irrigated turf and anything sitting on it. A mound of grass clippings on watered ground stays damp long enough to raise a generation, while the same clippings spread thin are done in a day. Next the dog run. Waste in dry ground crusts over quickly and stops being habitat, but waste in an area that gets hosed stays soft and usable. Then the trash area, meaning both the residue inside the container and the ground under it. Then compost, particularly if it sits inside a watered zone and never gets turned. Finally the irrigation system itself, where a cracked emitter or a leaking valve can keep one patch of soil saturated all season. Walk those five, dry them out, and you have removed nearly all the outdoor habitat available at this elevation. The dry air finishes what you start, which is an advantage humid cities do not have.

Why altitude buys you time

Cool nights change the arithmetic of a fly problem, and it is worth knowing how much. Development speed is temperature driven. Texas A and M AgriLife Extension gives about seven days from egg to adult at 95F and about 45 days at 60F. Colorado Springs summer highs average 84F and drop off sharply after dark at 6,035 feet, so the true rate sits comfortably between those poles. The practical effect is that populations here grow over several weeks rather than doubling over a weekend. You usually get a warning period: a few flies, then more, then a real problem, spread across most of a month. That argues for acting on the first handful rather than waiting to see if it gets worse. A source caught in early June, when the season is just opening, never becomes the August problem it would in a hotter city. It also means a thorough spring cleanup carries further here, because there is less time in the year for anything you missed to catch up.

Drains and slab leaks: the year-round half

Two fly problems in this city have nothing to do with the climate, because both live inside plumbing. Drain flies breed in a gelatinous film coating the inside wall of a pipe, above the standing water. That film is wet whatever the outside humidity is doing, which is why people are surprised to find drain flies in a dry January. Bleach and boiling water run down the middle of the pipe and leave the film untouched, so the answer is a stiff brush against the wall followed by a bacterial foam that expands and clings, repeated weekly for several weeks. Phorid flies are the more serious signal. A cracked sewer line or a broken supply line under a slab soaks the soil beneath the concrete and produces flies steadily, no matter how clean the room above looks. Rule out the simple explanations first: an overwatered plant, a mop bucket, spilled food under an appliance. If flies keep rising from one spot on a floor, get the line scoped. Repairing the pipe deals with the flies and the water damage together.

What a first inspection should cover

A good fly visit here is mostly a moisture survey, and the questions should come before any equipment. Expect to be asked which room, what time of day, which window, how many flies, and whether the count changes after irrigation runs or on collection day. flies gather on the sunlit side nearest their source, so those answers narrow the search before anyone walks the property. Outdoors, the inspection should cover irrigated zones and emitters, compost, clipping piles, pet waste areas, the container and the ground beneath it, and hose bibs. Indoors, every drain, overflow openings, houseplants, the water heater pan, and under appliances. If the flies are large and metallic, attic space and roof vents come next. The outcome you want is one sentence naming the wet material and a written plan with locations and dates. If nobody can identify a source, ask what the next diagnostic step is before agreeing to a recurring schedule, because a schedule with no source attached is just a subscription.

Reading two fly quotes side by side

Estimates for fly work can differ sharply and both be reasonable, because they often describe different jobs. Compare the scope, not the number. The separator is whether the quote names a source. Recurring perimeter and interior fly service is aimed at adults, so it continues indefinitely while the material stands. A quote that says brush and foam the two bathroom drains weekly for a month, pressure test the irrigation zone along the south bed, and scope the line under the hallway is aimed at production, and that plan has an end. Then ask the practical questions. How many visits are included, and what happens if flies persist at week three. Is drain work mechanical scrubbing or a poured product. Who performs the irrigation or plumbing repair if a leak turns up, and does the inspection fee come off the treatment. Get the answers written down with drains, rooms, and irrigation zones named. In a city with a short season, a clear scope also tells you whether the work will actually be finished before the weather turns.

Video guide

Fly Problems: Four Source-First Checks

A short visual guide to drain-film inspection, sanitation and exclusion, possible blow-fly sources, and seasonal cluster-fly entry points.

Read the video transcript

Start by identifying the fly and locating where immature stages could develop. For drain flies, inspect the organic film inside drains and other persistently wet areas. For house flies, correct waste, sanitation, screen, and door conditions. A sudden appearance of metallic blow flies can justify checking for a hidden organic source, but does not identify that source by itself. In regions with seasonal cluster flies, seal upper-wall entry gaps before adults move into buildings for winter shelter. Treatment should follow confirmed species and source evidence.

Fly control options in Colorado Springs: at a glance

Method	Typical published range	Best for	Time on site
Source Inspection and Fly Identification	$75–$200	Every job; the species points to the breeding site	45–90 minutes
Sanitation, Source Removal and Drain Bio-Cleaning	$100–$350	House flies, drain flies, fruit flies; the fix that lasts	1–3 hours
Cluster-Fly Void Treatment, Sealing and Follow-Up Monitoring	$150–$500; follow-ups $50–$150	Cluster flies each fall; ongoing checks for commercial sites	1–3 hours, plus scheduled checks
Exclusion: Screens, Door Sweeps and Air Curtains	$150–$600 (air curtains more)	Buildings with steady fly entry from outside	1–4 hours

What Affects Cost

✓How long the damp source takes to find, from a visible pile to a buried leak.
✓Number of drains needing brushing plus weekly follow-up foam.
✓How much irrigated turf and drip line has to be walked and tested.
✓Whether an irrigation or sewer repair requires digging.
✓Shared trash enclosures at a complex, which add inspection points.
✓Opening a wall or attic to reach a dead animal and repairing afterward.
✓How many return visits are included rather than billed separately.

📊

What's your biggest concern about flies?

When to Call a Professional

Call when you have dried every damp spot you can reach and flies keep arriving. In a dry climate that generally means hidden water: a line leaking beneath a slab, an irrigation break underground, or a drain in a space you rarely enter. Move quickly on a sudden indoor burst of large metallic flies, because a carcass keeps producing adults for weeks regardless of the weather outside. Phorid flies rising from the same floor spot deserve the same urgency, since the leak behind them is working on your foundation too. Ask the provider to name the wet source and to list the drains, rooms, and irrigation zones the plan covers.

DIY vs Professional

A homeowner controls most of the water here, which means most of the solution. Spread clippings so they dry rather than leaving a mound on watered turf. Move compost off irrigation zones and turn it. Pick up pet waste twice a week, especially in a run that gets hosed. Wash the inside of containers and hose the ground beneath them. Walk the drip line each spring and repair any emitter soaking one patch of soil. Then brush and foam the drains and repeat over a month. Most household fly complaints in Colorado Springs end right there. What to hand over is water you cannot see. A slab leak, a buried irrigation break, or an animal dead inside a wall needs a camera, a moisture meter, or an opening cut, and with local home values near 455,000 dollars, an accurate diagnosis is worth buying.

Local Context

Colorado Springs sits at about 6,035 feet, receives roughly 16 inches of moisture a year, and runs average humidity near 51 percent, which is dry enough that fly larvae have almost no natural habitat. Fly season here runs May through October and follows irrigation rather than weather, so a heavily watered lot can carry pressure while a xeric yard next door barely sees a fly. Altitude also softens the peak. Summer highs average 84F rather than the mid nineties, and nights cool off sharply, so development sits well short of the fastest rates the extension charts describe and populations build over weeks rather than days. Winter lows near 18F then close outdoor breeding entirely, leaving drains and plumbing leaks as the only sources still working from November through March.

Fly research layer · reviewed August 2026

The sighting pattern should determine the inspection route

A location name cannot identify the fly or its breeding source. Around Colorado Springs, Colorado, record size, color, resting behavior, where adults collect, and when they appear. Then inspect the matching source category instead of treating every small fly or every large fly the same way.

Small flies near drains or wet areas

UC IPM explains that moth or drain flies develop in moist organic matter, often the film inside sink, shower, or sewer drains. Large numbers can point to a source larger than one drain. Confirm the site and remove the developmental material; spraying adults does not remove it.

UC IPM moth and drain fly guide

House flies around doors, waste, or food

EPA identifies removal of animal waste, garbage, decaying plant material, and moist larval habitat as the main IPM opportunity. Screens and increased air movement can help with entry; traps are supplements, not substitutes for source correction.

EPA fly IPM strategies

Cold-season nuisance fly check

In colder-season states such as Colorado, slow flies at upper windows during fall, winter, or early spring can fit a cluster-fly pattern. University of Minnesota Extension notes that cluster flies use upper walls and attics for winter shelter and do not reproduce indoors. Identification and exterior exclusion timing matter more than assuming an indoor sanitation failure.

University of Minnesota Extension fly guide

This research layer summarizes public sources; it is not a local surveillance result, species identification, breeding-source finding, health determination, or substitute for an on-site inspection.

Review the evidence and correction policy

Prevention Tips

✓Spread grass clippings thin so the dry air can finish them off quickly.
✓Move compost off irrigation zones and turn it so it heats rather than sours.
✓Pick up pet waste twice a week, particularly in any hosed run.
✓Wash the inside of trash containers, since residue is the actual larval food.
✓Hose the ground under containers and let it dry in the sun.
✓Inspect drip emitters each spring for the ones keeping soil permanently wet.
✓Brush and foam bathroom and utility drains every few weeks all year.
✓Pour water into unused floor drains monthly so the trap seal holds.
✓Screen attic vents and cap chimneys so animals cannot enter and die inside.

💡 Did You Know?

★Phorid flies prefer running to flying
★Drain flies are sometimes called moth flies

Frequently Asked Questions

Why do I have flies at 6,000 feet in dry air?

Because the moisture is applied rather than atmospheric. Humidity near 51 percent supports no larvae, but irrigated turf, a hosed pet run, compost, a container with residue, or a leaking pipe supports plenty. Fly problems in Colorado Springs track watering habits, which is why neighboring properties can have very different levels of activity.

When is fly season in Colorado Springs?

Colorado Springs runs May through October, following irrigation rather than rainfall. It opens when landscape watering starts and closes as winter lows near 18F arrive. Because summer highs average 84F rather than the mid nineties, the season builds gradually instead of spiking, so early cleanup pays off more here than in hotter cities.

Does the cooler climate slow flies down?

Yes, noticeably. Texas A and M AgriLife Extension puts house fly development at about 45 days at 60F and roughly seven days at 95F. With highs near 84F and cool nights at this elevation, the real pace lands between those figures, so you generally get weeks of warning rather than days before a source becomes obvious.

What are the small flies in my bathroom?

Drain flies. They are gray, fuzzy, about a tenth of an inch, and they rest still on the wall rather than circling. Tape clear plastic over the drain overnight and check the underside in the morning. Because a drain stays wet regardless of the dry air outside, these are a year-round complaint at this elevation.

Why are there flies in my house in January?

They are indoor flies. Winter lows around 18F stop outdoor breeding completely, so a fly in the kitchen in midwinter came from a drain, a plumbing leak, an overwatered plant, or something dead in the structure. Winter is a good time to trace one, since nothing outside is adding to the confusion.

Can grass clippings cause a fly problem here?

Only if they stay wet. A mound of clippings sitting on irrigated turf holds moisture long enough for larvae to develop, while the same clippings spread thin in this dry air are useless within a day or two. Spreading rather than piling is one of the cheapest fly controls available on a watered lot.

Do phorid flies mean a plumbing leak?

Frequently, and it is worth checking early. They breed in wet decaying material, so a cracked line under a slab or a broken irrigation valve provides ideal habitat. Rule out overwatered plants and spilled food under appliances first, then have the line scoped if flies keep rising from the same spot on a floor.

Large shiny flies appeared indoors. What does that mean?

Something died in the structure. University of California IPM notes blow flies can complete development in as little as seven days, with adults emerging one to two weeks after maggots appear. Check attic space, roof vents, wall cavities, and the chimney. Removing the carcass ends the emergence, and no spray does that job.

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📚 Sources & Further Reading

Content provenance and service transparency

General fly identification, source inspection, sanitation, exclusion, and prevention guidance is supported by the cited EPA and university extension references. Generated educational visuals are labeled and do not document a local provider or service visit. Species, breeding source, provider availability, pricing, products, credentials, and service terms require direct verification.

Published by Fly Exterminator · No named licensed-professional review is claimed · Updated 2026-09-11T20:15:22.496Z

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