Quick answer: Bugs in firewood are normal and rarely a threat to the house. Carpenter ants, dampwood termites, beetles and spiders shelter in valley woodpiles, but they need the bark or damp wood they arrived in. Stack wood off the ground and well away from the house, bring in a day or two at a time, never spray it, and buy it near where you burn it.
Key takeaways
- Purdue Extension is blunt about it: most firewood pests pose no direct threat to the home, and carpenter ants or termites carried in on a log will not spread to the framing.
- Store the bulk of your wood at least 30 feet from the house and off the ground, and keep only a day or two of wood by the door.
- Never treat firewood with insecticide. Burning treated wood can release harmful fumes into the room.
- Salem and McMinnville sit inside Oregon’s emerald ash borer quarantine, so hardwood firewood cannot leave Marion or Yamhill County.
What bugs live in a Willamette Valley woodpile?
Mostly insects that were already living in the tree when it was cut, plus a few that moved in afterward. Purdue Extension’s firewood publication lists long-horned beetles, flatheaded borers, bark and ambrosia beetles, carpenter ants, termites in wood stacked on the ground, plus spiders, sowbugs, pillbugs and wasps.
Around Salem the cast is local. Big-leaf maple, oak and Douglas-fir rounds carry bark beetles and borers. Wet wood on soil draws Pacific dampwood termites and moisture ants. Carpenter ants hollow out punky logs. Dry piles suit spiders, and rodents dig in underneath.
| Pest | What you see in the wood | Risk to the house | What to do |
|---|---|---|---|
| Carpenter ants | Large black ants, smooth galleries, coarse sawdust | Low from the log; a pile on the house can feed a colony that also uses the wall | Burn nest pieces first; keep the pile off the ground and siding |
| Dampwood termites | Big cream-to-brown insects, wet galleries, tiny pellets | Low indoors; they need soaking wet wood | Burn it; fix whatever keeps the pile wet |
| Bark and wood-boring beetles | Round or oval exit holes, fine sawdust, larvae under bark | Nuisance; they need bark or fresh wood to breed | Burn within a season; a few may emerge indoors |
| Spiders | Webs between pieces, egg sacs | Bites are uncommon; black widows are the one to respect | Gloves and long sleeves; knock pieces together first |
| Sowbugs, earwigs, millipedes | Under bark and at the bottom of the pile | None; moisture pests that dry out indoors | Vacuum strays; store wood drier |
| Mice and rats | Burrows under the pile, droppings, shredded nesting | High if the pile touches the house | Rack the wood and move it 30 feet away |
Black widows are uncommon in the northern Willamette Valley but not unheard of, and a dry, undisturbed woodpile is their kind of spot. Our guide to dangerous spiders in Oregon shows how to recognize one. Wear gloves, always.
Can bugs in firewood infest your house?
Almost never. The exceptions are about where the pile sits, not the log in your hand. Purdue Extension puts it plainly: most firewood pests pose no direct threat to the home, its contents or its occupants. Carpenter ant wood brought inside generally will not spread the infestation, and termites carried in with firewood will not infest structural wood.
Why not? Bark beetles and borers need bark or freshly cut wood to lay eggs in. Dampwood termites need wood that stays soaking wet. A carpenter ant satellite nest needs a queen back in the parent colony. None of that exists in a dry, heated living room. The insects that crawl out of a log by the stove are confused, not colonizing.
The real risk is a pile stacked against the house on bare soil for years. It stays damp, it touches the siding, and it becomes a bridge. Carpenter ants nesting in the pile forage into the wall. Rodents under it find the crawl space vent. Dampwood termites and decay fungi move into a wet sill plate. Our overview of wood destroying bugs in Oregon covers what happens once they reach structural wood.
How far from the house should you store firewood?
As far as is practical, and never touching it. Nebraska Extension recommends locating the bulk of your firewood at least 30 feet from the home to keep rodents from becoming a problem, with a small supply near the door, about what you burn in one or two days. Purdue sets a minimum of 3 feet between wood and building; treat that as the floor, not the goal.
- Off the ground on a rack, pallets or blocks, so air moves underneath and termites cannot reach it from the soil.
- Top covered, sides open. A tarp draped to the ground traps moisture and breeds the pests you are avoiding.
- Sun and wind. A south or west exposure dries wood faster than a shaded north wall.
- Oldest wood first. Rotate the stack so nothing sits for years.
- Not in the garage or crawl space. Both are inside your home’s envelope, so a pile there is a pile in the house.
How do you bring firewood inside without bringing bugs with it?
Bring in only what you will burn in the next day or two, and give each piece a knock on the way. Purdue’s advice is at most a couple of days’ supply, because a week in a 70 F room wakes up bugs in firewood that would otherwise stay dormant.
- Wear gloves and long sleeves. Spiders bite when pressed against skin, not when left alone.
- Knock two pieces together and brush loose bark and webs off outside.
- Check the cut ends and under loose bark for galleries, sawdust or ants. Heavily worked pieces go in the fire now or stay outside.
- Carry the wood straight to the stove or a metal rack beside it, not a basket by the couch or the garage floor.
- Vacuum anything that crawls out and empty the canister outside. Do not spray.
If ants pour out of a log in numbers, that was a nest piece. Burn it now and check the layer it came from; the rest may be the same.
Never spray firewood for bugs
You are going to burn that wood in your living room. Purdue warns against treating firewood with chemicals because of the possibility of harmful fumes when the wood is burned, and Nebraska Extension says the same: do not spray the wood with insecticides and then burn it in the house.
It also does not work. Insects under bark and deep in galleries are out of reach of a surface spray, so you would add a residue without solving anything. Storage, rotation and a good shake accomplish more than any product.
Why buying local firewood matters in Marion, Polk and Yamhill counties
Because moving firewood moves the pests inside it, and Oregon now has a hard rule about it. The Oregon Department of Agriculture reports that emerald ash borer, a beetle that kills ash trees, was discovered in Forest Grove in June 2022, the first confirmation on the West Coast. ODA’s quarantine covers Washington, Yamhill, Marion, Clackamas and Multnomah counties and prohibits moving firewood of any hardwood species out of them.
In plain terms, a load of oak or maple from a Salem or McMinnville supplier cannot travel to a cabin or a relative’s place outside the quarantine line. Polk County, including Dallas, sits outside the line as of this writing, but the smart habit everywhere is to buy wood near where you burn it. The beetles, ants and spiders in a pile are a nuisance when they come from a tree down the road and a real problem when they arrive from another region.
When to call a professional
Call when the problem stops being about the woodpile: carpenter ants trailing from the stack into the house, termite swarmers or mud tubes on the foundation near the pile, or beetle exit holes in framing, decking or furniture rather than in the logs.
We start with an inspection of the pile, the foundation and the crawl space, because the question is always whether the pests stayed in the wood or reached the structure. Carpenter ants with a satellite nest in a wall call for our ant control service, which locates and treats the nest rather than the foragers. Termite evidence in a sill plate or pier goes to our termite control service. Exit holes in structural wood or hardwood floors get a look from our wood beetle service, which sorts one-time borers from the beetles that reinfest.
Every treatment uses EPA-registered products applied according to the label, with family- and pet-considerate options, and we tell you what to expect, including any re-entry times. AAA Pest Exterminators has been family-owned and operated in Salem since 1997, with no long-term contracts.
Frequently asked questions
Can termites in firewood spread to my house?
Not from a log you carry inside. Purdue Extension notes that termites accidentally brought indoors with firewood will not infest structural wood. The risk is a pile sitting on soil against the house for years, which can bridge termites, moisture and decay into a sill plate. Keep the stack off the ground and off the siding.
Should I spray my firewood for bugs?
No. Purdue and Nebraska Extension both advise against it, because burning treated wood can release harmful fumes into the house, and surface sprays do not reach insects under bark anyway. Dry storage, burning the oldest wood first, and knocking pieces together before you carry them in do the job without adding anything to the fire.
What are the little holes and sawdust in my firewood?
Usually bark beetles or wood-boring beetles that were in the tree before it was cut, the most common bugs in firewood around here. They need bark or fresh wood to breed, so any that emerge indoors are a nuisance, not an infestation. Burn that wood within the season. If similar holes show up in your framing, deck or floors, that is a different situation and worth an inspection.
Can I bring firewood home from a campsite or another county?
Leave it there. Oregon’s emerald ash borer quarantine prohibits moving hardwood firewood out of Marion, Yamhill, Washington, Clackamas and Multnomah counties, and the reason applies everywhere: the insects and diseases in a load of wood travel with it. Buy wood near where you burn it, and burn it this season.
Pests in the nest? Don’t stress. Call the best.
Family-owned and operated in Salem since 1997. No long-term contracts. Serving Salem, Keizer, Albany, Dallas, Woodburn and McMinnville.
Not sure what you’re looking at? Text us a photo and we’ll help identify it.
