It’s time to call a hornet control service when you find a nest near your home, see hornets flying steadily in and out of one spot, notice them indoors, get stung without an obvious cause, or have someone in the household who is allergic to stings. Most “hornets” people see in North America are actually yellowjackets or bald-faced hornets, which are aerial yellowjackets, while the European hornet is the only true hornet commonly found in the United States. Saela Pest Control is a residential and commercial pest control company that provides the best hornet control for homes and businesses, with an A+ rating from the Better Business Bureau. Here are ten signs that a nest needs professional attention and what each one usually means.
1. Steady Hornet Traffic Around Your Property
A steady stream of hornets or yellowjackets flying to and from the same spot is the most reliable sign of a nest nearby. Watch from a distance for a flight line into an eave, a gap in siding, a shrub or a hole in the lawn, and keep people away from that area. UC IPM’s guide to yellowjackets and other social wasps notes that colonies are begun each spring by a single queen and can reach between 1,500 and 15,000 individuals, depending on the species, so traffic that looks light in early summer usually grows.
2. You’ve Found a Nest
Finding a nest close to a door, walkway, deck or play area is a clear reason to call a professional. Nests differ by species: Penn State Extension describes bald-faced hornet nests as gray and football-shaped, paper wasps hang open combs shaped like an umbrella, and most yellowjackets nest underground. Our overview of common wasp species can help you tell them apart. Common nesting sites include:
- Tree branches and shrubs, where bald-faced hornets hang their nests
- Roof eaves and overhangs
- Attics and wall voids, used by some yellowjackets and by European hornets
- Sheds, barns, playhouses and other outdoor structures
Don’t knock down, spray or plug a large nest yourself. Penn State Extension notes that a bald-faced hornet nest that isn’t close to a building entrance can usually be left alone until the colony dies in fall, but a nest near people or inside the house is a job for a professional.
3. Hornets Inside Your Home
An occasional wasp that wanders in through an open door isn’t a concern, but repeated sightings indoors can mean a nest inside a wall, attic or ceiling. UC IPM notes that yellowjackets sometimes nest in voids in the walls and ceilings of houses, and NC State Extension’s European hornet fact sheet lists attics and wall voids among European hornet nest sites. Don’t seal the gap they are using: Penn State Extension warns that plugging the opening of a nest in a wall can cause yellowjackets to chew through interior drywall into the home.
4. Defensive Hornets
Hornets or yellowjackets that fly at people instead of ignoring them are usually defending a nest close by. Bald-faced hornets defend their nests aggressively, according to Penn State, and UC IPM notes that defensive behavior increases as the season goes on, colonies grow and food becomes scarcer. If this happens in one part of the yard, stop work there and have the nest found before anyone goes back.
5. Stings Without an Obvious Cause
Repeated stings on your property, especially in the same area, usually mean someone is getting close to a nest without realizing it. Mowing, trimming or walking near a hidden ground nest can bring workers out quickly, and UC IPM points out that wasp stingers have no barbs and can be used repeatedly. Note where each sting happened, because that location helps a technician find the nest; ground nests are covered on our yellowjacket control page.
6. Girdled Twigs or Bark Damage
Bark stripped in rings around twigs can be a sign of European hornets, the only true hornet commonly found in the United States. NC State reports that they have been seen girdling twigs of dogwood, birch, rhododendron and fruit trees, and that unlike most stinging insects they also fly at night and may be drawn to lit windows. If you see large brown-and-yellow hornets around damaged shrubs, look for a nest in a nearby hollow tree, shed, attic or wall void, from a safe distance.
7. Seasonal Changes
Hornet and yellowjacket activity follows the seasons: queens start new nests in spring, colonies grow through summer, and run-ins with people rise in late summer and fall. UC IPM explains that yellowjackets forage mainly for protein, usually other insects, while nests are growing, then show up at picnics, barbecues, garbage cans and outdoor pet food dishes in fall. A clear increase in activity in early summer is a good time to call, because a smaller colony is easier and safer to treat.
8. A History of Hornet Problems
Last year’s nest won’t be reused, but the conditions that attracted it often remain. Clemson Cooperative Extension’s yellowjacket fact sheet notes that only newly fertilized queens survive the winter and that nests are rarely used again the next spring. Check the same eaves, sheds, shrubs and wall gaps each spring; every Saela plan includes a 50+ point property inspection covering nesting sites, structural gaps and outdoor structures.
9. Allergies or Health Concerns
If anyone in the household is allergic to stings, treat any nest near the house as urgent. The CDC’s guidance on stinging insects notes that people who are allergic to venom may experience anaphylaxis, a potentially life-threatening reaction that requires immediate emergency care, and that people with a history of severe reactions should carry an epinephrine auto-injector. Penn State Extension also advises people with known wasp sensitivities to have all nests close to their homes removed by professionals.
10. Large Properties or Hard-to-Reach Nests
Nests high in trees, under steep eaves or inside walls are hard to reach safely, and a sting while on a ladder adds a fall risk. On larger properties, nests can also go unnoticed until someone mows or trims beside one. Saela follows an integrated pest management cycle of pest identification, activity monitoring, targeted treatment and evaluation, so a nest is identified before it is treated and the result is checked afterward. Saela quotes pest control based on pest type, location, property size, visit frequency and treatment products, so compare Saela’s plans and pricing for your property.
When to Make the Call
Most of these signs can be seen from a safe distance, so you can act on them without getting close to the nest. Call a professional when a nest is near an area people use, inside the house or out of safe reach, or when someone in the household is allergic to stings. For more on what professional removal involves, see our guide to hornet exterminators.
A professional visit should identify the species, find every active nest, treat it in protective gear and explain how to keep new queens from settling in. In a February 2024 Google review, Mark Lovgren wrote that Saela’s technicians “explained everything they were doing and why and were very polite.”
If you’ve noticed any of these signs, book a call to have the nest identified and treated. Saela’s American Fork, Utah location is rated 4.9 out of 5 from 118 reviews on Google as of October 2026.
Who wrote this article?
Devin Hutchings (Marketing Director at Saela Pest Control) wrote this article.
Devin leads Saela’s marketing and growth strategy. He brings more than 15 years of marketing experience across Uber, C.R. England, Lugg, and Neighbor. His background spans customer acquisition, retention, and developing marketing channels for service businesses and consumer marketplaces.
