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Termites
Termites in Iowa
Termites are often called "silent destroyers" for good reason — they can cause significant structural damage long before a homeowner notices anything is wrong. Iowa State University Extension documents termite activity in nearly every county, with the highest pressure in the southern half of the state.
What Are Termites?
Signs of a Termite Infestation
Mud tubes along the foundation or basement walls
Pencil-thin tunnels termites build to travel between soil and wood while staying protected from open air.
Discarded wings near windowsills or doors
Left behind after a swarm, once winged reproductives have shed them to start a new colony.
Wood that sounds hollow when tapped
Termites eat wood from the inside out, so damage is often well underway before it's visible externally.
Doors or windows that suddenly stick
Often caused by moisture and structural wood damage, not just seasonal humidity.
Termites vs. Carpenter Ants: How to Tell the Difference
Both are wood-destroying pests common in Iowa, but they behave — and need to be treated — very differently.
| Feature | Termites | Carpenter ants |
|---|---|---|
| Do they eat wood? | Yes — wood is a food source | No — they tunnel through it but don't consume it |
| Wings (swarmers) | Two pairs, equal in length | Two pairs, front wings noticeably longer |
| Waist | Broad, no pinch | Narrow, pinched waist |
| Waste signs | Mud tubes; damage hidden internally | Visible sawdust-like frass piles near entry points |
What Attracts Termites to Your Home
1.
Wood in direct contact with soil — deck posts, stairs, or siding touching the ground
2.
Excess moisture around the foundation from poor drainage or gutter issues
3.
Mulch and wood debris piled against the house
4.
Cracks in the foundation or gaps around utility lines
Termite Swarm Season in Iowa
Peak: March–May
Spring swarming — often triggered by a warm rain — is usually the first sign homeowners notice. Winged reproductive termites leave an established colony to start new ones nearby. A swarm seen indoors typically means a colony is already established in or near the home, not just passing through.
Your Questions About Termites Answered
Are termites really a problem in Iowa, or mostly a coastal issue?
They're a real concern here. Iowa State University Extension has documented eastern subterranean termite activity in nearly every county, with the heaviest pressure in the southern half of the state.
How can I tell if I have termites or carpenter ants?
Look at the waste they leave behind: carpenter ants push out visible sawdust-like frass near their nest entrance, while termites build mud tubes and hide damage internally. Body shape is another clue — termites have a broad waist, while carpenter ants have a pinched one.
Do termites bite or pose a health risk to people?
No. Termites aren't a health threat to people or pets — the risk is entirely to the structure of the home, not to anyone living in it.
If I see a few flying termites, do I definitely have an infestation?
Seeing swarmers, especially indoors, is a strong signal that a colony is already established nearby — it's worth getting confirmed rather than assumed, since damage from subterranean termites is often hidden until it's significant.
How does professional termite treatment work?
Treatment typically starts with an inspection of the foundation, basement, and crawl spaces to confirm active activity versus old damage, followed by a plan tailored to how the colony is accessing the structure.