The short version
Around Fort Collins, queens start nests in May, and colonies peak in late summer. Small, low paper wasp nests can be handled at dusk. Leave wall, ground and high nests to a pro.
- Treat nests at dusk, when wasps are home.
- Never seal a hole wasps are using.
- Ground and wall nests are best left to a pro.
- Knock down small nests early in spring.
- Call 911 for breathing trouble after a sting.
Anyone in Fort Collins dealing with wasps, hornets or yellowjackets at home.
What to look for
Late-summer colonies are big and quick to sting. Wasps defend the area around their nest. Near a door or deck, stings will happen.
- 1Wasps flying straight lines to and from one spot.
- 2Open umbrella-shaped comb under a porch ceiling or railing.
- 3Grey, papery football-shaped nest hanging in a tree or eave.
- 4Yellowjackets streaming from the ground after mowing or trimming.
- 5Yellowjackets crowding trash cans, soda cans and pet food.
- 6Wasps disappearing into a hole in the lawn or a wall.
Why it’s worth acting soon
- Nests grow all summer.
- Ground nests get disturbed by mowing.
- Wall nests can chew through into rooms.
- Stings are dangerous for anyone allergic.
Treatment options and typical costs
Inspection and Nest Identification
$75–$200
A pro starts by confirming the species and the nest location. Paper wasps, hornets and yellowjackets each call for a different approach.
- Time
- 45–75 minutes
- Best for
- Every job; species and nest location decide the method
Preventive Spring Treatment and Follow-Up
$150–$400
Preventive work makes the most sense for Fort Collins homes that have had nests two years running, or where someone has a sting allergy. It is a modest cost compared with a wall-void job.
- Time
- 45–90 minutes
- Best for
- Repeat nests, or someone allergic to stings
Aerial Nest Treatment and Removal
$100–$400
A treated nest should go quiet within a day. A few stragglers are normal. Ask whether removal and a follow-up check are included.
- Time
- 30–90 minutes
- Best for
- Exposed paper wasp, hornet and bald-faced hornet nests
Sealing Up After the Nest Is Dead
$150–$450
Sealing gaps around Fort Collins homes also blocks other pests, so the work pays twice. Screened vents and tight soffits also keep out birds and bats.
- Time
- 1–2 hours
- Best for
- Sealing soffits, vents and gaps after a wall nest has died
Prices are typical published ranges. Ask what’s included before you compare quotes.
In cold-winter areas, old nests are empty by now. It's a good time to fix vent covers and siding gaps before queens go looking in spring.Which wasps live around Fort Collins.
Bald-faced hornets build big gray nests in trees and eaves. They cause most stings. Western yellowjackets nest in the ground and in wall voids. They build open, umbrella-shaped combs under eaves and railings. Paper wasps are the most common around Fort Collins. They rarely sting. Mud daubers build tube-shaped mud nests.
Local wasps conditions in Fort Collins.
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 wasps 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 wasp activity here: mid-summer through fall (July-October). 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.
Yellowjackets sometimes nest in attics and wall voids, getting in through a torn vent screen or a gap in the soffit. Buzzing in a ceiling is worth a look.When they’re most active.
Nests die back after the first hard freeze in fall. Early spring is the easiest time to remove small starts.
Where they nest around houses here.
Watch for traffic in and out of gaps. Check eaves, attic vents and window frames. Plenty of homes in Fort Collins have basements, but most nests are higher up. Homes from Fort Collins out to Loveland and Greeley share the same favorite nest spots. A ground nest looks like wasps streaming from one hole.
A year of wasps in Fort Collins.
- Spring: queens start new nests around May. Knock down small starts. - Winter: lows near 17°F in Fort Collins. Nests die; only queens survive. - Late summer: peak season. Workers hunt sweets near people. - Summer: highs near 87°F in Fort Collins help colonies grow fast.
Wasp, hornet or bee?
- Paper wasp: slim, long legs, open comb. - Honey bee: fuzzy and golden. about relocation. - Mud dauber: thin waist, mud tube nests. Rarely stings. - Hornet: larger, with a big closed paper nest. - Yellowjacket: bright yellow and black, nests in the ground.
If you get stung.
If someone carries an epinephrine pen, use it. 911 for trouble breathing or a swollen face or throat. An antihistamine can ease itching and swelling. Wash the sting and use a cold pack. Move away from the nest first.
Keeping wasps away from the patio.
- Food: cover plates and drinks outdoors. - Gaps: seal gaps after a nest is gone. - Spring checks: knock down small nests early. - Fruit: pick up fallen fruit. - Trash: keep lids tight and bins away from doors.
Ground nests: what to do.
Pros treat ground nests at night, when the colony is home. Don't pour gasoline or water in. Don't mow over it. Keep kids and pets away. Mark the hole with a flag.
A nest, or just visitors?
A nest shows steady traffic to one spot. Wasps on flowers or trash cans may come from far away. Follow the line back to an eave, vent, shrub or hole. Watch at dusk, when they fly home.
Treating a small nest yourself, safely.
- Only if it’s small, low and out in the open. - Leave it overnight, then bag the nest. - Never spray from a ladder. - Use a jet wasp spray from several feet away. - Wear long sleeves, pants and gloves. - Wait until dusk, when wasps are home and slow. - Never if anyone in the house is allergic.
Wasps and pets.
Most stings just swell a little. Dogs often snap at wasps and get stung on the face. Keep pet food and water bowls indoors in late summer. your vet if the throat swells or breathing changes.
Kids and wasps.
Swatting makes a sting more likely. Teach kids to walk away calmly. Use cups with lids for sweet drinks outside. Check play sets, slides and playhouses for nests each spring.
After the nest is gone.
Seal the gap a wall nest used once it's quiet. Wasps don't reuse old nests. Knock down small new nests early next spring. Check nearby eaves for new starts.
Wasps at picnics and barbecues.
- Drinks: use cups with lids or straws. - Kids: teach them to walk away calmly. - Calm: don’t swat; slowly move away. - Trash: bag scraps and close the bin. - Food: keep it covered until you eat.
Ground nests in the lawn.
Watch for wasps flying in and out of the grass. Yellowjackets often nest in old rodent holes. Mark it, and keep mowers and kids away until it's treated.
Questions to ask before you sign.
- What kind of wasp is it? - Is a return visit included? - Is removal of the dead nest included? - How will you treat a nest inside the wall?
What affects the price
- An open comb or a nest inside a wall.
- Nest height and whether a ladder or lift is needed.
- Sealing gaps after the nest is dead.
- Species: paper wasps cost least, hornets and yellowjackets more.
- After-hours, weekend or emergency scheduling.
- Return visit to confirm a void nest is dead.
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What's your biggest concern about wasps?
When to call for help
They'll find another way in. Don't seal a hole wasps are using. right away if anyone in the house is allergic. Call for nests in walls, attics, the ground, or anywhere high.
What you can do yourself
A small, reachable paper wasp nest is a fair DIY job. Spray it at dusk with a wasp aerosol. Knock it down the next day. Big, high or hidden nests are a job for a pro.
Wasps in Fort Collins
Winter lows near 17°F in Fort Collins end the season; only new queens survive, tucked into sheltered spots. In denser parts of Fort Collins, nests turn up in eaves, balconies, signs and wall gaps. Fort Collins only gets about 16 inches of rain a year, so local wasps often gather at pools, fountains and dripping taps.
Local research
Wasps in Fort Collins, CO: what the public record shows
Before you compare quotes, it helps to know which wasps 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.
Wasp species recorded in Colorado
- Western yellowjacket (Vespula pensylvanica) — UC IPM: 'the most commonly encountered species and is sometimes called the "meat bee"' in California and the Western states; ground and wall-void nester and aggressive scavenger…
- Bald-faced hornet (Dolichovespula maculata) — Penn State: 'found in most of the 48 contiguous states and D.C., throughout Canada and in Alaska'; actually an aerial yellowjacket that builds the football-shaped gray paper nes…
- European paper wasp (Polistes dominula) — Penn State: 'first reported in 1978 around Boston', now 'coast to coast ... although they are apparently less common in the Southeast and Great Plains'; nests in 'eaves of struc…
- Native paper wasps (Polistes spp. (e.g., P. fuscatus, P. apachus, P. exclamans)) — Open umbrella-shaped nests under eaves, porch ceilings and railings. UC IPM: paper wasp colonies 'vary between 15 to 200 individuals'; Penn State: queens 'establish nests in May…
When wasps are busiest around Fort Collins
CSU: European paper wasp 'earliest activity is sometimes seen in the first half of March'; 'Individual colonies are established anew each spring' and 'may contain several dozen individuals by the end of summer'. Western yellowjacket colonies die each fall (USU).
CSU: European paper wasp is 'very abundant in every urbanized county in eastern Colorado and the three western Colorado counties of Mesa, Montrose, and Delta'; nests in 'outdoor grills, large bells, pipes, rock cavities, and hollow spaces behind walls'.
Rules that apply in Colorado
For context, nationally
- 788 — Deaths from hornet, wasp, and bee stings, 2011–2021 (US). CDC MMWR
- 72 deaths per year — Average annual sting deaths, 2011–2021 (US). CDC MMWR
Sources: Colorado State University Extension; CDC MMWR; Yellowjackets and Other Social Wasps (Pest Notes); Baldfaced Hornet; European Paper Wasp. Figures are quoted as the source prints them. How we check our sources
Simple ways to keep wasps away
- Avoid bright floral clothing and strong perfume near nests.
- Fill gaps in retaining walls and stacked stone.
- Mow at dawn when ground-nesting wasps are sluggish.
- Cover drinks outdoors and use lidded cups for kids.
- Caulk around cable, gas and conduit entry points.
For a nest in the ground or a wall, a pro treats the entrance and checks back to make sure the traffic has stopped before anything is sealed.Did you know?
A bald-faced hornet is actually a yellowjacket, not a true hornet
Mud daubers stock their nests with paralyzed spiders
Questions people ask
What should I do if I get stung?
An antihistamine helps with itching. 911 for trouble breathing or a swelling throat.
Do wasp traps work?
They catch some yellowjackets, but rarely fix a nest problem. Place them away from where people sit.
How do I find a good wasp control company?
Check that they're licensed in Colorado. Ask how they treat hidden nests and whether removal is included.
Can I just leave the nest alone until winter?
If it's out of the way, often yes. Around Fort Collins, nests die back after the first hard freeze in fall.
What time of day should a wasp nest be treated?
At dusk or after dark, when they're home and calm.
Is it safe to remove a wasp nest yourself?
Around Fort Collins, a small, exposed nest can be treated at dusk with the right spray and protective clothing. Anyone allergic to stings should never try.
When is wasp season in Fort Collins?
Around Fort Collins, queens start nests in May, and colonies peak in late summer. Nests die back after the first hard freeze in fall.
Are hornets common in Fort Collins?
Bald-faced hornets are, in trees and on eaves. Most stings come from yellowjackets, though.
Nearby cities
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Sources (9)
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 Wasp Exterminator · Updated September 11, 2026 · How we write these guides