The short version
Around Greeley, 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 Greeley dealing with wasps, hornets or yellowjackets at home.
What to look for
Near a door or deck, stings will happen. Wasps defend the area around their nest. Late-summer colonies are big and quick to sting.
- 1Yellowjackets crowding trash cans, soda cans and pet food.
- 2Grey, papery football-shaped nest hanging in a tree or eave.
- 3Wasps hovering at a mulch bed or retaining wall gap.
- 4Wasps appearing indoors near light fixtures or windows.
- 5Wasps clustered at a hummingbird feeder or ripe grapes.
- 6Steady wasp traffic in and out of one soffit gap.
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
Ground and Wall-Void Nest Treatment
$150–$500
Wall-void nests behind siding get the same dust treatment. In Greeley, the pro should leave the opening unsealed until all traffic stops, since trapped wasps chew inward toward living space.
- 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
This is the step homeowners skip most often. Sealing the void after treatment keeps the next colony out.
- Time
- 1–2 hours
- Best for
- Sealing soffits, vents and gaps after a wall nest has died
Preventive Spring Treatment and Follow-Up
$150–$400
Prevention won't stop every nest, and no honest company in Greeley will say it does. It cuts the odds and catches nests that start early.
- Time
- 45–90 minutes
- Best for
- Sting allergies or repeat nest spots
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 Greeley.
Mud daubers build tube-shaped mud nests. They rarely sting. Paper wasps are the most common around Greeley. 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.
Local wasps conditions in Greeley.
Knowing Greeley'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 Greeley 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. Greeley sits in a semi-arid climate, and that sets the pace for wasp activity here: mid-summer through fall (July-October). In Greeley, 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 Greeley usually starts outside and works inward, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure first.
Paper wasps like quiet, sheltered corners. Check garage rafters, door tracks and high shelves in spring for small starter combs.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.
A ground nest looks like wasps streaming from one hole. Homes from Greeley out to Loveland and Fort Collins share the same favorite nest spots. Plenty of homes in Greeley have basements, but most nests are higher up. Check eaves, attic vents and window frames. Watch for traffic in and out of gaps.
A year of wasps in Greeley.
- Summer: highs near 90°F in Greeley help colonies grow fast. - Late summer: peak season. Workers hunt sweets near people. - Winter: lows near 16°F in Greeley. Nests die; only queens survive. - Spring: queens start new nests around May. Knock down small starts.
Wasp, hornet or bee?
- Yellowjacket: bright yellow and black, nests in the ground. - Hornet: larger, with a big closed paper nest. - Mud dauber: thin waist, mud tube nests. Rarely stings. - Honey bee: fuzzy and golden. about relocation. - Paper wasp: slim, long legs, open comb.
If you get stung.
Move away from the nest first. Wash the sting and use a cold pack. An antihistamine can ease itching and swelling. 911 for trouble breathing or a swollen face or throat. If someone carries an epinephrine pen, use it.
Keeping wasps away from the patio.
- Trash: keep lids tight and bins away from doors. - Fruit: pick up fallen fruit. - Spring checks: knock down small nests early. - Gaps: seal gaps after a nest is gone. - Food: cover plates and drinks outdoors.
Ground nests: what to do.
Mark the hole with a flag. Keep kids and pets away. Don't mow over it. Don't pour gasoline or water in. Pros treat ground nests at night, when the colony is home.
A nest, or just visitors?
Watch at dusk, when they fly home. Follow the line back to an eave, vent, shrub or hole. Wasps on flowers or trash cans may come from far away. A nest shows steady traffic to one spot.
Treating a small nest yourself, safely.
- Never if anyone in the house is allergic. - Wait until dusk, when wasps are home and slow. - Wear long sleeves, pants and gloves. - Use a jet wasp spray from several feet away. - Never spray from a ladder. - Leave it overnight, then bag the nest. - Only if it’s small, low and out in the open.
Wasps and pets.
your vet if the throat swells or breathing changes. Keep pet food and water bowls indoors in late summer. Dogs often snap at wasps and get stung on the face. Most stings just swell a little.
Kids and wasps.
Check play sets, slides and playhouses for nests each spring. Use cups with lids for sweet drinks outside. Teach kids to walk away calmly. Swatting makes a sting more likely.
After the nest is gone.
Check nearby eaves for new starts. Knock down small new nests early next spring. Wasps don't reuse old nests. Seal the gap a wall nest used once it's quiet.
Wasps at picnics and barbecues.
- Food: keep it covered until you eat. - Trash: bag scraps and close the bin. - Calm: don’t swat; slowly move away. - Kids: teach them to walk away calmly. - Drinks: use cups with lids or straws.
Ground nests in the lawn.
Mark it, and keep mowers and kids away until it's treated. Yellowjackets often nest in old rodent holes. Watch for wasps flying in and out of the grass.
Questions to ask before you sign.
- How will you treat a nest inside the wall? - Is removal of the dead nest included? - Is a return visit included? - What kind of wasp is it?
What affects the price
- Distance from the company's base and travel time.
- Number of nests found on the property.
- Roof pitch and safe access to the nest location.
- After-hours, weekend or emergency scheduling.
- Ground nest with multiple entrances or deep burrows.
- 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
Don't seal a hole wasps are using. They'll find another way in. Call for nests in walls, attics, the ground, or anywhere high. right away if anyone in the house is allergic.
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 Greeley
Winter lows near 16°F in Greeley end the season; only new queens survive, tucked into sheltered spots. In Greeley's neighborhoods, eaves, decks, play sets and shrubs are favorite nest sites. Greeley only gets about 14 inches of rain a year, so local wasps often gather at pools, fountains and dripping taps.
Local research
Wasps in Greeley, 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 Greeley, 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 Greeley
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.
- Clean outdoor eating areas right after meals.
- Plug weep holes with mesh inserts, not solid caulk.
- Inspect grills, mailboxes and light fixtures before use.
- Trim shrubs so nests cannot hide near walkways.
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?
Some paper wasps can tell their nestmates apart by their faces
Mud daubers stock their nests with paralyzed spiders
Questions people ask
Do wasp traps work?
They catch some yellowjackets, but rarely fix a nest problem. Place them away from where people sit.
What should I do if I get stung?
An antihistamine helps with itching. 911 for trouble breathing or a swelling throat.
Why are there suddenly so many wasps in late summer?
Colonies are at their biggest by late summer. Food gets scarce, so workers hunt sweets and protein near people.
Should I be worried about a nest in the ground?
Ground nests are usually yellowjackets. Mowing over them sets them off. Yes, if it's near a path or play area.
How long does wasp nest removal take?
Usually under an hour. Hidden nests may need a second visit a few days later.
What's the usual way to get rid of a nest?
In Greeley, a dust or spray into the nest opening at dusk, then removal once activity stops.
How often should you check your property for wasp nests?
Every week or two from spring through late summer. In Greeley, look under eaves, decks, sheds and play equipment, where small nests are easy to deal with.
When is wasp season in Greeley?
Around Greeley, 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 Greeley?
Bald-faced hornets are, in trees and on eaves. Most stings come from yellowjackets, though.
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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