The short version
Around Fort Collins, mosquito season runs from about May through September. Start by dumping standing water every week. A barrier spray every few weeks adds steady relief.
- Dump standing water every week.
- Evening biters are usually house mosquitoes.
- Barrier sprays last about three to four weeks.
- Larvicide handles water you can’t drain.
- Use repellent with DEET, picaridin or IR3535.
Homeowners and renters in Fort Collins who want their yard back.
What to look for
Mosquitoes breed in standing water, even a bottle cap's worth. In summer heat, eggs become biting adults in about a week. Often the source is a neighbor's yard or a storm drain.
- 1Mosquitoes indoors resting on walls or in closets.
- 2Swarms rising from shrubs when you brush past.
- 3Dogs testing positive for heartworm.
- 4A sump pit or crawl space holding water.
- 5A neighbor's pool turning green and untended.
- 6Adults resting under deck boards or in ivy.
Why it’s worth acting soon
- Each new generation is bigger than the last.
- Bites can spread West Nile virus.
- Itchy welts, especially for kids.
- Heartworm risk for dogs.
bite, to get protein for their eggsOnly female mosquitoesUS CDC in standing water, from a bottle cap to a pondMosquitoes breedUS EPA West Nile virus is the most common mosquito-borne disease in the U.S.Mosquito diseasesUS CDC Treatment options and typical costs
Property Inspection for Breeding Sites
$0–$150 (often bundled with a first treatment)
Before anything is sprayed, a pro in Fort Collins should work out which mosquito you have and where the larvae are growing. Container breeders and floodwater breeders call for different tactics.
- Time
- 30–60 minutes
- Best for
- Every yard; finds where mosquitoes actually breed
Monitoring and Seasonal Plans
$50–$150 per follow-up visit; $350–$900 per season bundled
Most seasonal plans in Fort Collins pair a barrier spray every 3–4 weeks with larvicide checks and a wrap-up visit in fall. Paying per season often beats paying per visit.
- Time
- 15–30 minutes per check; season runs spring through first frost
- Best for
- Anyone who wants the yard usable all summer
Barrier (Residual) Yard Treatment
$75–$200 per visit; $350–$900 per season
A barrier treatment coats the undersides of leaves, shrubs, and shaded surfaces where adult mosquitoes rest during the day around your Fort Collins home. Adults that land there pick up a lethal dose.
- Time
- 20–45 minutes per visit, repeated every 3–4 weeks
- Best for
- Shaded yards with shrubs, ivy, and dense landscaping
Misting Systems and In2Care-Style Stations
misting $2,000–$4,500 installed plus refills; stations $200–$500 per season
In2Care-style stations lure egg-laying females and dust them with larvicide. The females spread it to other water and die from a fungus they picked up, which is why Fort Collins pros like them for container-heavy lots.
- Time
- Misting: half a day. Stations: under an hour.
- Best for
- Specific yards: heavy outdoor use or spray-averse owners
Prices are typical published ranges. Ask what’s included before you compare quotes.
A treatment visit covers the shaded plants and beds where adults rest, along with any standing water that can't be drained.Which mosquitoes bite around Fort Collins.
They can travel a long way from where they hatch. Floodwater mosquitoes hatch in big waves after heavy rain or snowmelt. They're the main West Nile carriers. They breed in storm drains. House mosquitoes (Culex) bite from dusk into the night.
Local mosquitoes conditions in Fort Collins.
A provider who works Fort Collins and Colorado every day can point out the specific conditions that matter most here, and getting the scope, price, and follow-up terms in writing makes it easier to compare options. Knowing Fort Collins's seasonal timing lets you schedule treatment before the busy stretch rather than after it, which usually means faster service and a more accurate quote. An inspection in Fort Collins usually starts outside and works inward, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure first. Around Fort Collins, the area is mostly urban, so mosquitoes pressure can differ from one block to the next depending on how tight the entry points are and how much food, water, or shelter is close by. Fort Collins sits in a semi-arid climate, and that sets the pace for mosquito activity here: late spring through early fall; year-round in the deep south.
Mosquitoes that bite indoors usually slip in through gaps around doors or torn window screens.Mosquito season in Fort Collins.
Numbers usually peak in July and August. West Nile cases usually peak in late summer.
A year of mosquitoes in Fort Collins.
- Winter: fix drainage and store containers upside down. - Fall: activity fades with cooler nights. - Summer: peak season in Fort Collins, especially July and August. - Spring: dump water and clean gutters before May.
The weekly water walk.
- Tree holes: fill them with sand. - AC drip lines and downspouts: make sure water drains away. - Pet bowls: refresh daily. - Birdbaths: change the water twice a week. - Tarps and covers: pull them tight so water runs off. - Toys and buckets: store them upside down. - Saucers and pots: empty them or add sand. - Gutters: clear leaves so water drains.
Avoiding bites.
- Timing: tiger mosquitoes bite by day; house mosquitoes at dusk. - Screens: repair holes in window and door screens. - Fans: a patio fan keeps weak-flying mosquitoes away. - Clothing: long sleeves and pants help at dusk. - Repellent: DEET, picaridin, IR3535 or oil of lemon eucalyptus.
Low-cost ways to cut mosquitoes.
- Lights: yellow bug lights attract fewer insects to the porch. - Trimming: thin out dense shrubs and tall grass. - Pumps and fountains: moving water breeds far fewer mosquitoes. - Mosquito fish: they eat larvae in ornamental ponds. - Mosquito dunks: Bti tablets kill larvae in rain barrels and ponds.
Mosquito or look-alike?
- Mosquitoes: slim, long legs, and a needle-like mouth. - No-see-ums: tiny biting gnats near marshes. Screens need a finer mesh. - Non-biting midges: swarm near water at dusk. Harmless, just annoying. - Crane flies: look like giant mosquitoes. They don’t bite.
When a bite needs a doctor.
Spreading swelling or an infected-looking bite needs a check too. See a doctor for high fever, stiff neck or confusion. About one in five get a fever, headache or body aches. Most people infected with West Nile virus never feel sick. Most bites just itch for a few days.
Protecting your pets.
Refresh pet water bowls daily; in dry Fort Collins a bowl or an irrigation puddle is often the only standing water on the block. Keep animals inside until a yard treatment dries. Talk to your vet about year-round prevention. Heartworm reaches dogs through mosquito bites, and cats can get it as well; in Fort Collins the main exposure runs July through September.
What a treatment visit looks like.
Most plans repeat every three to four weeks. Then they spray shady shrubs, where adults rest. Larvicide goes in water you can't drain. They dump or treat standing water. The tech walks the yard first. A visit usually takes 20 to 45 minutes.
Rain barrels and ponds.
- Pool covers: drain standing water after rain. - Tarps: shake out any that hold rainwater. - Gutters: clear them so water drains away. - Bird baths: change the water every few days. - Ponds: fish and moving water keep larvae down. - Barrels: cover openings with fine mesh.
Questions to ask before you sign.
- When can kids and pets go back outside? - How do you protect bees and flowers? - What happens if bites come back between visits? - Do you treat standing water too? - How often will you come? - What product will you spray?
What affects the price
- Ponds, creeks, or wetland edges on the property.
- Misting system installation and refills.
- Gutter cleaning or drainage fixes bundled in.
- In2Care-style station count and servicing.
- Local labor rates and licensing costs.
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What's your biggest concern about mosquitoes?
When to call for help
early in the season, before the first big wave. Ponds, drains and dense shrubs are hard to handle yourself. Call if bites still keep you indoors. Dumping water should come first.
What you can do yourself
A pro adds larvicide for water you can't drain. They also spray where adults rest, every few weeks. The biggest win is free: dump standing water every week. Use repellent and run a fan on the patio.
Mosquitoes in Fort Collins
Fort Collins only gets about 16 inches of rain a year, so local mosquitoes breed where people add water: sprinklers, pools, fountains and AC drips. Summer highs around 87°F in Fort Collins speed up the life cycle. In denser parts of Fort Collins, storm drains, catch basins and gutters are big breeding spots. Fort Collins has a semi-arid climate, and mosquitoes activity here tends to pick up late spring through early fall; year-round in the deep south. Around Fort Collins, most of the housing is urban, so the usual entry points, moisture spots, and sheltered areas near the structure are what an inspection checks first. Around Fort Collins, take a minute to note where you have seen activity and when it appears, so the inspection is faster and the quote more accurate. A local provider who knows Fort Collins and Colorado can point out the specific conditions that matter most here before you commit to a plan.
Local research
Mosquitoes in Fort Collins, CO: what the public record shows
Before you compare quotes, it helps to know which mosquitoes actually live in Colorado, when they are busiest around Fort Collins, and what the state figures look like. Everything below links to the agency or university page it came from.
West Nile neuroinvasive disease cases, 2024
Neuroinvasive counts are the most reliable state comparison because nearly all severe cases are diagnosed and reported.
CDCWhen mosquitoes are busiest around Fort Collins
CDC: West Nile transmission June through October, peaking late August to early September. Illinois found its first positive mosquito batch of 2025 on May 9, so larval control should start in May.
For context, nationally
- 1,808 — West Nile virus disease cases reported, 2024. CDC
- 1,347 (75% of cases); 173 deaths — West Nile neuroinvasive disease cases, 2024. CDC
Sources: CDC. Figures are quoted as the source prints them. How we check our sources
Simple ways to keep mosquitoes away
- Repair torn window and door screens.
- Replace corrugated downspout extensions with smooth pipe.
- Dump and scrub birdbaths every week.
- Empty plant saucers after every rain.
- Rake leaf litter from shaded beds.
- Run a fan on the patio at dusk.
Renting? Shared courtyards, drains and landscaping are usually the property manager's to handle, so let them know.Did you know?
Tiger mosquitoes arrived in used tires in the 1980s
Mosquito means little fly in Spanish
Questions people ask
Can mosquito control help with West Nile risk?
It can lower it by cutting the number of biting mosquitoes. Repellent and dumping standing water still matter most.
Can I get rid of mosquitoes permanently?
Not completely. They fly in from nearby. Removing water and spraying resting spots cuts them down a lot.
Will mosquito treatment kill bees and butterflies?
It can if spray hits flowers. Ask them to skip blooming plants. Spraying when bees rest helps too.
Do I need a seasonal plan or is one treatment enough?
One treatment helps for an event or a few weeks. Barrier sprays fade in three to four weeks. Steady relief takes repeat visits.
Are misting systems worth it?
For a few homes, yes. They're costly to install and need refills. Most yards do fine with source removal and regular spraying.
How likely are homeowners to hire a mosquito control service?
Around Fort Collins, mosquito control works by removing standing water, treating the water that cannot be drained, and applying barrier treatments where adults rest. Around Fort Collins, because they keep breeding through the season, an ongoing plan usually works best.
When is mosquito season in Fort Collins?
It runs from about May through September.
Do mosquitoes in Fort Collins carry West Nile?
They can. West Nile is found in every lower-48 state, Colorado included. Cases usually peak in late summer. Repellent and dumping standing water are your best protection.
Nearby cities
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Sources (10)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Mosquito Exterminator · Updated September 11, 2026 · How we write these guides