Reviewed By Jun Bukht, ACE, CWCO, Founder and Owner of Major Pest Control
If you’ve found a nest on your property and you’re not sure what’s living in it, you’re not alone — hornets and yellow jackets get mixed up constantly, and knowing which one you’re dealing with actually matters.
Hornets tend to leave people alone unless their nest is disturbed. Yellow jackets are far more likely to sting with little warning, especially around food. This guide breaks down how to tell them apart by size, nest location, and behaviour, and what to do if you’ve found one on your Alberta property.
Hornets vs. Yellow Jackets
| Hornets | Yellow Jackets (Wasps) | |
| Size | 1–1.5 inches (2.5–4 cm) | 0.4–0.75 inches (1–2 cm) |
| Appearance | Robust, larger body; reddish-brown, yellow, and black; duller markings | Slender body; bright black and yellow bands; clear, sharp stripes |
| Nest location | Above ground — hanging in trees, shrubs, eaves, or on buildings | Usually hidden — underground, in wall voids, attics, or bushes |
| Nest shape | Large, grey, football-shaped paper nest with one entrance hole | Smaller paper nest with multiple entrance holes, often out of sight |
| Behaviour | Generally less aggressive; usually ignores people unless nest is threatened | More aggressive; will sting with little provocation, especially near food |
| Diet | Other insects, tree sap, nectar | Insects, but strongly drawn to sugary food, meat, and garbage |
How to Tell a Hornet From a Yellow Jacket
Size and Appearance
The easiest way to tell them apart at a glance is size. Hornets are the bigger of the two, typically 1 to 1.5 inches long, with a thicker, more robust body. Their colouring varies between reddish-brown, yellow, and black, and their markings tend to look duller and less defined.
Yellow jackets are noticeably smaller, usually under an inch long, with a slender body and sharp, bright black-and-yellow banding. If the stripes look crisp and the insect looks slim, you’re likely looking at a yellow jacket, not a hornet.
Nest Location and Shape
This is often the biggest clue, and it’s also where most Alberta homeowners run into trouble — because yellow jacket nests are built to stay hidden.
Hornet nests:
- Large, grey, football-shaped, made of a paper-like material
- Hang from trees, shrubs, eaves, or the sides of buildings
- One visible entrance hole near the bottom
- Easy to spot once you know what you’re looking for
Yellow jacket nests:
- Usually built underground, in wall voids, attics, or dense bushes
- Multiple entrance holes
- Smaller and often completely out of sight until activity picks up
That difference explains a lot of what we hear from homeowners. Nests are rarely found hanging in a tree the way you’d expect from a textbook photo — they’re in a wall void, under a deck, tucked into landscaping timbers, or in a hole in the ground.
Behaviour
Hornets are generally the calmer of the two. They’ll usually leave people alone and only become defensive if their nest is directly disturbed.
Yellow jackets are a different story — they’re more aggressive by nature, especially around food and drinks, and can sting with very little provocation. If you’re finding wasps repeatedly showing up near a barbecue, garbage can, or patio table, yellow jackets are the more likely culprit.
Where Alberta Homeowners Actually Find These Nests
Based on real inquiries from Alberta homeowners, nests show up in some very specific — and very hideable — spots. If any of these sound familiar, you’re probably dealing with a yellow jacket nest rather than a hornet nest, since these are exactly the hidden, low-to-the-ground locations yellow jackets prefer.
1. Nest in Landscaping Timbers or Railroad Ties
A common one in backyards with landscape timber borders. The wasps use gaps between the timbers as an entrance, and the nest is often out of sight until someone gets stung while mowing nearby.
2. Nest Under a Deck, Entering Along the Fascia or Roofline
Entry points are usually along the fascia, roofline, or a gap where the deck structure meets the house. Activity often increases quickly over just a few days once the colony gets established.
3. Nest in a Wall Void, With Dead Wasps Appearing Inside the House
If you’re seeing dead wasps inside your home — often near baseboards or windowsills — with no clear source, a nest in a wall void is a likely cause. The wasps are entering through a small exterior gap and some end up inside instead of finding their way back out.
4. Nest Under the Front Step
Front step nests tend to get noticed fast because of how much foot traffic passes right by them. With kids and pets going in and out constantly, activity near the entrance can escalate quickly.
5. Nest at the Base of a Balcony
Wasps will use a small gap where a balcony frame meets the house as an entry point, building the nest out of sight underneath. It’s often only noticed once wasps are seen repeatedly flying in and out of the same spot.
6. Nest Under a Shed
Similar to deck nests — the wasps use a small gap at the base of the shed and the nest itself stays completely hidden from view until activity picks up.
7. Underground or Ground Nest
Yellow jackets frequently nest in the ground, using an existing hole or burrow. These nests can be especially defensive, since disturbing the entrance can trigger the whole colony to respond at once.
8. Nest Between the House and Siding, Near an Electrical Meter
Small gaps around electrical meters or where siding meets the house are common entry points. These nests can also provide access into the home itself if left untreated, so resealing the gap after treatment matters.
9. Nest on the Second Floor of a Home
Second-floor nests are less common but do happen, usually built into an eave, soffit, or gap higher up on the structure. These can be harder to inspect and treat safely without the right equipment, which makes professional removal especially important here.
10. Nest in Soil Against the Foundation Wall
A ground-level variation of the underground nest, built right against the foundation itself. These are easy to overlook since the entrance can blend into the surrounding soil or mulch.
Why It Matters Which One You Have
Hornets and yellow jackets aren’t treated the same way, and identification affects both safety and approach:
- Yellow jackets are more likely to swarm defensively, especially ground nests and nests near high-traffic areas like decks and front steps.
- Hidden nests (wall voids, underground) need to be treated at the actual nest, not just where the insects are seen — spraying visible wasps doesn’t reach the colony.
- Hornet nests are usually visible and self-contained, which can make them more straightforward to treat, but they still shouldn’t be handled without protective equipment.
What to Do If You Find a Nest
- Don’t disturb it. Vibration, movement near the nest, or blocking the entrance can trigger defensive stinging, especially with yellow jackets.
- Keep kids and pets away from the area, particularly if the nest is near a deck, step, or play area.
- Avoid DIY spray treatments on hidden nests. Store-bought sprays rarely reach a nest in a wall void or underground, and disturbing the entrance without eliminating the colony can worsen activity.
- Note where you’re seeing activity, even if you can’t see the nest itself — entry points, dead wasps indoors, or a specific corner of the yard all help a technician find it faster.
- Call a professional for removal, especially for underground, wall void, or hard-to-reach nests.
When DIY Is (and Isn’t) a Reasonable Option
A hornet nest that’s small, low, and clearly visible in an open area away from foot traffic can sometimes be treated by a homeowner using proper protective gear and an approved product, applied at dusk when activity is lowest.
That said, most of the situations we hear about don’t fit that description — they involve hidden nests, high-traffic areas, kids in and out of the yard, or a nest that’s already been disturbed and become defensive. In those cases, professional treatment is the safer call, since it targets the nest directly and reduces the risk of getting stung.
Our Wasp Nest Removal Process
- Inspection — A technician identifies the nest type, locates the entry point(s), and checks for hidden nests in walls, soil, or structures.
- Treatment — Product is applied directly at the nest or entry point, which is the only way to eliminate a hidden colony rather than just the wasps you can see.
- Follow-up — Activity typically stops within 24–48 hours. For nests near entry points into the home (siding gaps, meters, foundation), we can reseal the opening to prevent reuse.
- Prevention advice — We’ll flag anything else on the property that’s likely to attract future nesting, such as exposed food sources, gaps in siding, or unused structures.
How To Prevent Wasp and Hornet Nests
- Seal gaps around siding, meters, foundations, and rooflines before spring.
- Keep garbage and recycling bins tightly closed — yellow jackets are strongly drawn to food waste.
- Check landscaping timbers, sheds, and deck undersides early in the season, before a small nest becomes a large one.
- Avoid leaving sugary drinks or food uncovered outdoors during late summer, when yellow jacket activity peaks.
Real Questions From Alberta Homeowners
These are actual questions we’ve received from homeowners dealing with wasp nests around their property. If your situation sounds like one of these, you’re not dealing with anything unusual — these are some of the most common calls we get.
1. Once we got a call because wasps had nested in landscape timbers in their backyard and their son had already been stung twice mowing the lawn.
“We have wasps nesting in two railroad ties in our back yard that we would like to get rid of, as my son has been stung twice mowing the lawn.”
2. A homeowner once called us about a fast-growing wasp nest on their back deck, with wasps entering along the fascia and roofline.
“There’s a wasp nest forming on our back deck. The entry point is along the roof line. They are entering along the top under the fascia and wall seam. It just started in the last few days and has become quite active.”
3. We also got a call about a wasp nest built into the soil right against their foundation wall.
“Wasp nest inside soil against the house foundation wall.”
4. We got a message about a heavily active wasp nest under their front step, worried since their kids were in and out of the house all day.
“We have a wasp nest under our front step with tons of wasp activity. Kids are constantly in and out of the house.”
FAQ
Are yellow jackets more aggressive than hornets?
Yes. Yellow jackets are generally more aggressive and will sting with little provocation, especially around food. Hornets tend to be calmer and usually only react if their nest is directly disturbed.
How do I know if a nest is a hornet nest or a yellow jacket nest?
Hornet nests are large, grey, and football-shaped, hanging visibly from trees, shrubs, or eaves. Yellow jacket nests are usually hidden — underground, in wall voids, attics, or bushes — and are harder to spot until activity increases.
We have a wasp nest in landscaping timbers in our backyard — is that dangerous?
It can be, especially if the area is regularly used or mowed. Nests in landscape timbers are typically yellow jacket nests and can be treated directly at the entry point without disturbing the whole structure.
There’s a wasp nest under my deck, and my kids play back there — how fast can this be handled?
Nests near high-traffic areas like decks and front steps are treated as priority calls. Most treatments happen within a day or two of contact, with activity stopping within 24–48 hours.
I’m seeing dead wasps inside my house near a wall — does that mean there’s a nest inside?
Likely yes. Dead wasps appearing indoors, especially near baseboards or windows, usually mean a nest is established in a wall void, with wasps entering through a small exterior gap.
Can you remove an underground wasp nest?
Yes. Underground nests are treated directly at the entrance. These are some of the more defensive nests, so we don’t recommend homeowners attempt this themselves.
Can you seal the entry point after removing a nest near my siding or electrical meter?
Yes. Once the nest is treated and activity stops, we can reseal the gap to help prevent wasps or other pests from using the same entry point again.
Reviewed By Jun Bukht, ACE, CWCO
Jun Bukht is the founder and owner of Major Pest Control. He holds the Associate Certified Entomologist (ACE) designation and is a Certified Wildlife Control Operator (CWCO), reflecting his commitment to science-based, humane pest management practices. Jun is the author of “Major Pest Control: Stories From the Trenches – A Homeowner’s Guide to Pest Control”, a best-selling book on KDP. His work and insights have been featured in television, radio, print, and online media across Alberta, where he discusses pest control, wildlife issues, and integrated pest management.