If you've got ants in your Western North Carolina home, there's a good chance you're dealing with either carpenter ants or odorous house ants. They're the two most common species across WNC in spring and early summer. The key difference comes down to size, behaviour, and where they show up. Knowing which one you're dealing with helps you take the right next step.
You've got ants. Now what exactly are you dealing with?
If you're here, you've likely moved past the "what is that?" stage.
You've seen the ants. Maybe more than a few. Now you're trying to figure out what they are before you decide what to do next.
Across Asheville, Brevard, Hendersonville, and the surrounding mountain communities, most spring and early summer ant problems come down to two types: carpenter ants and odorous house ants.
They're both common. But they behave differently, nest differently, and need different approaches to actually solve the problem.
Getting the identification right is the first practical step. If you're not quite sure what you're seeing, feel free to reach out to the Pisgah team and we'll help you narrow it down. But read on first so you can get a clearer picture of what you're likely dealing with.
Carpenter ants: how to recognise them
If you read our first article, this will feel familiar. If not, here's the quick way to spot them.
They're noticeably large
Carpenter ants are big. Most are black and around a quarter to half an inch long. If the ant made you stop and look twice because of its size, that's your first clue.
They have a narrow waist and bent antennae
Like most ants, they have a pinched waist and elbowed antennae. With carpenter ants, everything looks more pronounced because of their size.
You'll usually see them one at a time
Carpenter ants don't usually move in long, obvious trails across your kitchen or countertops. More often, you'll spot one here, one there. A windowsill. A door frame. A crawl space entrance. A deck post. They're foraging, not marching in lines.
They tend to show up near wood
This is one of the biggest clues. If you're seeing ants near window or door frames, decks or porch posts, crawl space areas, or roof eaves and fascia, that leans toward carpenter ants.
On heavily wooded lots, which are common throughout Transylvania County and the areas around Waynesville, we often find the nest closer to the home than homeowners expect. Sometimes it's in a deck post, sometimes in the framing just inside the crawl space. The trees and stumps nearby give colonies a strong foothold before they ever move into the structure itself.
Sawdust-like debris is the giveaway
If you notice small piles of sawdust-like material near wood, that's a strong sign. This debris is known as frass. It's material the ants have pushed out while tunnelling, sometimes mixed with tiny insect parts. If you're seeing that, there's a good chance the nest is inside or very close to that area.
If you want the full breakdown of how carpenter ants behave in WNC homes, you can read it here: Why Are Carpenter Ants Showing Up in My WNC Home?
Odorous house ants: what to look for
This is the other common scenario, and it looks very different once you know what to look for.
They're small, much smaller than carpenter ants
Odorous house ants are tiny by comparison, usually around an eighth of an inch long. If the ants you're seeing are small and easy to miss individually, you're likely not dealing with carpenter ants.
They move in trails
This is the big behavioural difference. Odorous house ants form visible trails. You'll often see a steady line of them moving along baseboards, countertops, window sills, or along walls and cabinets. If you're seeing a line of ants moving back and forth, this is your strongest clue.
The smell is the defining feature
Most people don't realise this part. If you crush one of these ants, it gives off a strong, unpleasant smell. People often describe it as rotten coconut or blue cheese. Not the most appealing test, but it's one of the most reliable ways to identify them. Carpenter ants don't have that smell.
They're drawn to food and moisture
Odorous house ants are much more of a kitchen pest. They're usually attracted to sweet foods, spills or crumbs, pet food, and moisture under sinks or near appliances. They'll nest wherever it works, outside under mulch or stones, or inside wall voids, floors, or near plumbing.
In older WNC homes, the area under the kitchen sink and around older plumbing connections is one of the first places we check. Slow drips and ageing pipe insulation create exactly the kind of persistent moisture these ants are drawn to, and they can establish a nest in a wall void fairly quickly once they find it.
You'll often see them in numbers
Unlike carpenter ants, these ants rarely show up alone. If you've got odorous house ants, you'll usually know it. There will be a lot of them, and they'll keep coming back.
Side by side: what's the difference?
If you're still unsure, here's the simple way to think about it.
If the ants are large, spread out, and showing up near wood, you're likely dealing with carpenter ants.
If the ants are small, moving in trails, and showing up in the kitchen or around food, you're likely dealing with odorous house ants.
If you crush one and notice a strong, unpleasant smell, that points clearly to odorous house ants.
Carpenter ants can cause damage over time because they excavate wood. Odorous house ants are more of a nuisance, but they can be persistent and hard to eliminate once established. The treatment approach is different for each, which is why getting this part right matters.
Why DIY sprays usually don't solve the problem
It's tempting to grab a spray and deal with what you can see. Sometimes that helps for a day or two. But it rarely fixes the problem.
You're only treating what's visible
Most ant colonies are outside the home or hidden deep inside walls, crawl spaces, or wood structures. In WNC homes especially, where crawl spaces and wooded surroundings make colonies harder to locate, treating the surface rarely gets to the root of the problem. Sprays only kill the ants you can see, not the colony they're coming from.
Crawl spaces in particular can make this tricky. When a colony is established in a floor joist or pier, it's not somewhere most homeowners are going to find it on their own, and it's not somewhere a surface spray is going to reach.
Odorous house ants can actually spread when sprayed
With odorous house ants, spraying trails can make things worse. It can cause the colony to split into multiple smaller colonies, a process called budding. Instead of solving the problem, it spreads it.
Carpenter ants require finding the nest
With carpenter ants, the key is locating where they're nesting. If that's not addressed, you'll keep seeing ants no matter how many you spray. A proper treatment focuses on the source, not just the symptoms.
Homesafe plans: the right level of coverage for WNC homes
Both of these ant species are covered under Pisgah Pest Control's Homesafe plans.
For most homeowners, Homesafe Basic is the right place to start. It covers common household pests, including both carpenter ants and odorous house ants.
For those looking for more complete protection, Homesafe Plus adds termite monitoring and protection using the Sentricon® System. That matters in Western North Carolina. Between general pest activity and the region's higher termite pressure, having both covered under one plan gives you a more complete level of protection for homes in Asheville, Brevard, Hendersonville, and across the mountains.
If you want to take a closer look at what's included, you can go ahead and visit the Pisgah services page.
What you can do right now
If you're trying to get things under control in the short term, there are a few practical steps that can help.
If you're dealing with carpenter ants
- Reduce moisture around the foundation
- Check crawl spaces for soft wood or sawdust-like debris
- Remove decaying wood near the home
If you're dealing with odorous house ants
- Clean up food sources and spills
- Wipe down surfaces to disrupt scent trails
- Check under sinks and appliances for moisture
These steps can slow things down. But if a colony is established, they won't fully solve the problem on their own.
Still not sure what you're seeing?
If you're not quite sure which ant you're dealing with, feel free to reach out. Our team here in the office is always happy to talk it through with you and help you figure out what's going on.
Frequently asked questions
What is the difference between carpenter ants and odorous house ants?
Carpenter ants are larger and usually found near wood. Odorous house ants are smaller, form trails, and are often found near food and moisture.
How do I identify odorous house ants?
They're small, move in trails, and give off a strong unpleasant smell when crushed. Most people describe it as rotten coconut or blue cheese.
Why do my ants smell when I squish them?
That smell is specific to odorous house ants. It's one of the easiest ways to identify them, and it's how they get their name.
Are odorous house ants dangerous?
They don't cause structural damage, but they can be persistent and contaminate food areas if a colony gets established inside the home.
Why do I have small black ants in my kitchen in North Carolina?
That's usually odorous house ants. They're attracted to food and moisture, especially in kitchens, and are very common across WNC homes in spring and early summer.
What is the best way to get rid of odorous house ants?
The most effective approach targets the colony, not just the ants you can see. DIY sprays can sometimes make things worse by causing the colony to split. Professional treatment is usually needed once the problem is established.
Next in this series: How Do You Get Rid of Ants in a WNC Home for Good?