The short version
Around South Portland, 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.
Homeowners and renters in South Portland with a nest near a door, deck or play area.
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 disappearing into a hole in the lawn or a wall.
- 2Yellowjackets streaming from the ground after mowing or trimming.
- 3A soft or discolored patch of drywall with faint buzzing.
- 4Large wasps circling porch lights after dark.
- 5Buzzing audible through a ceiling or wall on warm afternoons.
- 6Wasps appearing indoors near light fixtures or windows.
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
Nest location drives everything else in South Portland: height, whether it sits in a void, and how close it is to doors or play areas. The inspection should end with a plan and a price.
- Time
- 45–75 minutes
- Best for
- Every job; species and nest location decide the method
Preventive Spring Treatment and Follow-Up
$150–$400
Prevention won't stop every nest, and no honest company in South Portland will say it does. It cuts the odds and catches nests that start early.
- Time
- 45–90 minutes
- Best for
- Repeat nests, or someone allergic to stings
Ground and Wall-Void Nest Treatment
$150–$500
Yellowjackets nesting in South Portland lawns, retaining walls and old rodent burrows are treated by applying insecticidal dust directly into the entrance hole. Dust carries deep into the chambers as workers walk through it.
- 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 is priced by the number and size of openings. One gap is quick; a row of open vents takes longer.
- Time
- 1–2 hours
- Best for
- Sealing the gap once the nest is dead
Prices are typical published ranges. Ask what’s included before you compare quotes.
Yellowjackets often nest in old rodent holes and gaps in garden walls. Watch for wasps flying low and steady into one spot.Which wasps live around South Portland.
They're large, fly at night, and nest in hollow trees. European hornets live in Maine too. Bald-faced hornets build big gray nests in trees and eaves. They cause most stings. Eastern 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 South Portland. They rarely sting. Mud daubers build tube-shaped mud nests.
Local wasps conditions in South Portland.
An inspection in South Portland usually starts outside and works inward, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure first. Around South Portland, 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. South Portland sits in a humid continental climate, and that sets the pace for wasp activity here: mid-summer through fall (July-October). A provider who works South Portland and Maine 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 South Portland'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 South Portland have basements, but most nests are higher up. Homes from South Portland out to Portland and Scarborough share the same favorite nest spots. A ground nest looks like wasps streaming from one hole.
A year of wasps in South Portland.
- Spring: queens start new nests around May. Knock down small starts. - Winter: lows near 14°F in South Portland. Nests die; only queens survive. - Late summer: peak season. Workers hunt sweets near people. - Summer: highs near 78°F in South Portland 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
- Open comb, or hidden in a wall.
- Distance from the company's base and travel time.
- Roof pitch and safe access to the nest location.
- Sealing gaps after the nest is dead.
- Species: paper wasps cost least, hornets and yellowjackets more.
- Number of nests found on the property.
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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
Big, high or hidden nests are a job for a pro. Knock it down the next day. Spray it at dusk with a wasp aerosol. A small, reachable paper wasp nest is a fair DIY job.
Wasps in South Portland
Winter lows near 14°F in South Portland end the season; only new queens survive, tucked into sheltered spots. In South Portland's neighborhoods, eaves, decks, play sets and shrubs are favorite nest sites. With summer highs near 78°F in South Portland, colonies grow fast and are biggest by August.
Local research
Wasps in South Portland, ME: what the public record shows
Before you compare quotes, it helps to know which wasps actually live in Maine, when they are busiest around South Portland, and what the state figures look like. Everything below links to the agency or university page it came from.
Wasp species recorded in Maine
- 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 hornet (Vespa crabro) — Penn State: 'first detected in the 1840s', 'well established in the eastern United States', 'first reported from Arkansas in 1999'; workers 'up to an inch (25 mm) long', nests '…
- 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 South Portland
Queens emerge in April–May, colonies peak August–October, and workers die at the first hard frosts; only new queens overwinter (OSU, Penn State, UMN).
Bald-faced hornet range per Penn State covers most of the 48 contiguous states and D.C. European hornet is established across the eastern United States (Penn State).
Rules that apply in Maine
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: CDC MMWR; Baldfaced Hornet; European Hornet; European Paper Wasp; Yellowjackets and Other Social Wasps (Pest Notes). Figures are quoted as the source prints them. How we check our sources
Simple ways to keep wasps away
- Clean outdoor eating areas right after meals.
- Caulk around cable, gas and conduit entry points.
- Mow at dawn when ground-nesting wasps are sluggish.
- Note where nests appeared and inspect there early next year.
- Cover drinks outdoors and use lidded cups for kids.
- Hang wasp traps at the yard edge, not the patio.
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?
A bald-faced hornet is actually a yellowjacket, not a true hornet
Wasp nest paper inspired early experiments in making paper from wood
Questions people ask
Are wasps dangerous to my pets?
Dogs often get stung on the face. your vet if swelling spreads or breathing changes. They can be.
What time of day should a wasp nest be treated?
At dusk or after dark, when they're home and calm.
Will wasps come back to the same nest next year?
They don't reuse old nests. New queens often pick the same sheltered spots, though.
Can I just leave the nest alone until winter?
If it's out of the way, often yes. Around South Portland, nests die back after the first hard freeze in fall.
Can I seal the hole wasps are using?
They may chew into your house. Treat first, then seal once activity stops. No. Sealing traps them inside.
Are wasps considered an under-controlled pest?
Often, yes. Around South Portland, many nests go unnoticed until late summer, when colonies are biggest and most defensive.
Is it safe to remove a wasp nest yourself?
Around South Portland, a small, exposed nest can be treated at dusk with the right spray and protective clothing. Anyone allergic to stings should never try.
Are hornets common in South Portland?
Bald-faced hornets are, in trees and on eaves.
Nearby cities
Related guides
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