The short version
Around Broomfield, 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 Broomfield dealing with wasps, hornets or yellowjackets at home.
What to look for
Late-summer colonies are big and quick to sting. Near a door or deck, stings will happen. Wasps defend the area around their nest.
- 1Chewed, scarred wood on fences, decks or cedar siding.
- 2Wasps hovering at a mulch bed or retaining wall gap.
- 3Sudden wasp interest in overripe fruit under a tree.
- 4Wasps entering an attic vent, dryer vent or weep hole.
- 5Multiple stings on one person during a single outdoor task.
- 6Pets pawing at their face after sniffing a lawn spot.
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
Expect a pro to check eaves, vents, sheds and the ground. Multiple nests are common late in the season.
- 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 Broomfield 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
- Sting allergies or repeat nest spots
Ground and Wall-Void Nest Treatment
$150–$500
Never seal a live void nest. Plugging the hole too early can drive wasps into the house.
- Time
- 30–60 minutes plus a return visit
- Best for
- Yellowjackets in lawns, retaining walls, soffits and wall voids
Sealing Up After the Nest Is Dead
$150–$450
Sealing gaps around Broomfield 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.
Once a nest is dead, screening and sealing gaps around pipes and vents keeps next year's queen from using the same opening.Which wasps live around Broomfield.
Paper wasps are the most common around Broomfield. They build open, umbrella-shaped combs under eaves and railings. Western yellowjackets nest in the ground and in wall voids. They cause most stings. Bald-faced hornets build big gray nests in trees and eaves. Mud daubers build tube-shaped mud nests. They rarely sting.
Local wasps conditions in Broomfield.
Broomfield sits in a semi-arid climate, and that sets the pace for wasp activity here: mid-summer through fall (July-October). In Broomfield, the area is mostly suburban, 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. An inspection in Broomfield usually starts outside and works inward, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure first. Knowing Broomfield'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. A provider who works Broomfield 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.
An unscreened foundation vent is an easy way in for a yellowjacket queen. Wasps flying in and out of a vent all day are a sign of a nest inside.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.
Plenty of homes in Broomfield have basements, but most nests are higher up. Check eaves, attic vents and window frames. Watch for traffic in and out of gaps. A ground nest looks like wasps streaming from one hole. Homes from Broomfield out to Westminster and Arvada share the same favorite nest spots.
A year of wasps in Broomfield.
- Winter: lows near 18°F in Broomfield. Nests die; only queens survive. - Late summer: peak season. Workers hunt sweets near people. - Summer: highs near 88°F in Broomfield help colonies grow fast. - Spring: queens start new nests around May. Knock down small starts.
Wasp, hornet or bee?
- 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. - Paper wasp: slim, long legs, open comb.
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.
- 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. - Food: cover plates and drinks outdoors.
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?
Follow the line back to an eave, vent, shrub or hole. Watch at dusk, when they fly home. A nest shows steady traffic to one spot. Wasps on flowers or trash cans may come from far away.
Treating a small nest yourself, safely.
- 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. - Only if it’s small, low and out in the open.
Wasps and pets.
Keep pet food and water bowls indoors in late summer. your vet if the throat swells or breathing changes. Most stings just swell a little. Dogs often snap at wasps and get stung on the face.
Kids and wasps.
Use cups with lids for sweet drinks outside. Check play sets, slides and playhouses for nests each spring. Swatting makes a sting more likely. Teach kids to walk away calmly.
After the nest is gone.
Knock down small new nests early next spring. Check nearby eaves for new starts. Seal the gap a wall nest used once it's quiet. Wasps don't reuse old nests.
Wasps at picnics and barbecues.
- 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. - Drinks: use cups with lids or straws.
Ground nests in the lawn.
Mark it, and keep mowers and kids away until it's treated. Watch for wasps flying in and out of the grass. Yellowjackets often nest in old rodent holes.
Questions to ask before you sign.
- Is a return visit included? - Is removal of the dead nest included? - How will you treat a nest inside the wall? - What kind of wasp is it?
What affects the price
- Preventive spring treatment bundled with removal.
- Local labor rates and seasonal demand.
- Roof pitch and safe access to the nest location.
- After-hours, weekend or emergency scheduling.
- Sting allergy in the home requiring extra precautions.
- Ground nest with multiple entrances or deep burrows.
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What's your biggest concern about wasps?
When to call for help
Call for nests in walls, attics, the ground, or anywhere high. right away if anyone in the house is allergic. Don't seal a hole wasps are using. They'll find another way in.
What you can do yourself
Knock it down the next day. Big, high or hidden nests are a job for a pro. A small, reachable paper wasp nest is a fair DIY job. Spray it at dusk with a wasp aerosol.
Wasps in Broomfield
In Broomfield's neighborhoods, eaves, decks, play sets and shrubs are favorite nest sites. Winter lows near 18°F in Broomfield end the season; only new queens survive, tucked into sheltered spots. Broomfield only gets about 16 inches of rain a year, so local wasps often gather at pools, fountains and dripping taps.
Local research
Wasps in Broomfield, 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 Broomfield, 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 Broomfield
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
- Seal soffit seams and fascia gaps before spring.
- Screen attic, gable and dryer vents with fine mesh.
- Check sheds and garages for nests each May.
- Trim shrubs so nests cannot hide near walkways.
- Mow at dawn when ground-nesting wasps are sluggish.
Jot down where nests turned up this year. Queens often pick the same eaves and gaps, so you'll know where to look first next spring.Did you know?
European hornets hunt at night and are drawn to porch lights
Some paper wasps can tell their nestmates apart by their faces
Questions people ask
How long does wasp nest removal take?
Usually under an hour. Hidden nests may need a second visit a few days later.
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.
Are wasps dangerous to my pets?
your vet if swelling spreads or breathing changes. Dogs often get stung on the face. They can be.
Can I just leave the nest alone until winter?
If it's out of the way, often yes. Around Broomfield, nests die back after the first hard freeze in fall.
How do I know if I have wasps, hornets or yellowjackets?
Hornets build big, gray, closed nests. Yellowjackets nest in the ground or walls. Paper wasps build open, umbrella-shaped combs.
How common are wasp sightings?
In Broomfield, very common in late summer, when colonies peak and wasps go looking for sweet food.
When is wasp season in Broomfield?
Around Broomfield, 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 Broomfield?
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