Termite Droppings (Frass): Identification Guide

Termite droppings — called frass — are one of the most reliable indicators of a drywood termite infestation. Unlike subterranean termites that use feces to line tunnels and build mud tubes, drywood termites push droppings out through kick-out holes.

What Does Frass Look Like?

About 1 mm long — sand-grain size. Elongated, oval, with six concave sides. Color varies based on wood consumed — tan, brown, dark brown, or black. Hard, dry, and granular. Found in small cone-shaped piles beneath kick-out holes.

Frass vs Look-Alikes

Sawdust is irregularly shaped and fibrous; frass has uniform rounded pellets. Carpenter ant debris contains wood shavings mixed with insect parts. See termite vs ant. Frass is sometimes mistaken for coffee grounds or pepper.

Where to Look

Windowsills beneath wooden frames, along baseboards, on shelves below furniture, in attics beneath roof timbers, on floors below beams.

What Frass Tells You

You have drywood termites (not subterranean). The infestation is in wood directly above. Termites are actively feeding. The colony is established.

What to Do

Leave frass in place as evidence. Note the location. Look for kick-out holes (1-2 mm round holes). Schedule an inspection. Monitor for new piles after cleaning.

Treatment

Small infestations may respond to orange oil or boric acid. Widespread infestations may require fumigation. See drywood termite treatment and signs of termite damage.

How to Distinguish Termite Frass From Other Debris

The number one challenge when identifying frass is distinguishing it from other small granular materials you might find around your home. Here is how to tell the difference with confidence.

Frass vs Sawdust

Sawdust from woodworking, carpenter bees, or carpenter ants consists of irregularly shaped, fibrous wood shavings. Under magnification, individual particles look like tiny splinters or fibers. Termite frass, by contrast, consists of uniform, smooth, oval pellets with flat, concave sides. The shape difference is dramatic under a magnifying glass — frass pellets look like tiny, six-sided footballs, while sawdust looks like tiny wood chips.

Frass vs Insect Debris

Other wood-boring insects produce waste that might be confused with termite frass. Powderpost beetle frass is a fine, flour-like powder — much finer and more uniform than termite frass. Carpenter bee frass contains visible wood fibers and is typically found beneath perfectly round holes in wood. Carpenter ant debris is a mixture of wood shavings and insect body parts.

Confirming the Source

Once you have identified what you believe is termite frass, look for kick-out holes in the wood directly above the pile. These small (1-2 mm), round holes are where drywood termites push their droppings out of their galleries. Finding kick-out holes above a frass pile is conclusive evidence of an active drywood termite infestation.

If you are not confident in your identification, collect a sample in a sealed bag or container and bring it to a pest control professional. Accurate identification is important because drywood termites require fundamentally different treatment than subterranean species. Getting the identification right saves time, money, and your home from continued damage.

The Importance of Proper Response

When homeowners find what they believe is termite frass, the natural instinct is to clean it up immediately. While understandable, this can actually hinder proper diagnosis and treatment. Here is the recommended approach.

Leave the frass undisturbed until a professional can examine it. Frass piles tell inspectors exactly where the termites are active — the colony is in the wood directly above the pile. The volume and freshness of frass helps estimate how active the colony is and how long it has been established. And the color and composition can help confirm the species.

If you must clean the area (for example, in a kitchen or dining room), sweep the frass into a sealed bag and save it as a sample. Then monitor the area for new deposits. Fresh frass appearing within days confirms ongoing, active infestation and provides the inspector with useful timeline information.

Once an inspection is complete and treatment is planned, you can clean normally. But during the diagnostic phase, preserving evidence helps ensure accurate species identification and targeted treatment planning.

Termite frass is one of nature's most reliable pest indicators. If you find it in your home, you have actionable evidence of an active drywood termite colony in a specific, identifiable location. This is actually good news — it means you caught the infestation through its visible evidence, and you know exactly where to direct treatment. Schedule an inspection promptly, treat as recommended, and your frass-finding days will be behind you.

Expert Field Observations

Frass identification is one of the first skills I teach in pest management training, and in 15 years of field work, accurate frass identification has been the starting point for countless successful drywood termite treatments. The six-sided pellet shape is remarkably consistent and distinctive -- once you know what to look for, you will never confuse it with sawdust.

I keep a small vial of confirmed termite frass in my inspection kit as a comparison sample. When homeowners show me what they have found, I can immediately compare it side by side. This simple tool has resolved identification questions on the spot hundreds of times.

-- Sarah Mitchell, BCE, 15 years in Integrated Pest Management

Trusted Sources and Further Reading

• EPA Guide to Safe Pest Control -- EPA resources on identifying pest evidence and responding appropriately.
• National Pest Management Association -- Professional identification guides for termite frass and look-alike materials.
• University of Florida Entomology Department -- Research on drywood termite frass characteristics and diagnostic protocols.
• Clemson Cooperative Extension -- Homeowner resources on recognizing and responding to termite frass discoveries.
• USDA Forest Service -- Technical information on insect frass identification and wood-boring insect diagnostics.

Main Causes

Subterranean termites reach structures by foraging from soil colonies, building protective mud tubes across foundations and over slab edges to access untreated wood. Drywood termites colonize directly through small flight cuts during seasonal swarms, settling into eaves, attic framing, and exposed structural lumber without any soil contact. Common upstream conditions include wood-to-soil contact at deck posts and porch columns, moisture-damaged framing from roof leaks or plumbing leaks, mulch piled against the foundation, firewood stacked against the house, and untreated wood within six inches of grade. Established outdoor colonies near a structure provide a constant supply of foragers, and a single mature subterranean colony contains 60,000 to several million workers capable of damaging structural wood for years before becoming visually obvious.

How to Identify

Confirm termites through mud tubes, swarmer evidence, frass, hollow-sounding wood, or direct sighting of workers and soldiers in damaged wood. Subterranean termites build pencil-width mud tubes up foundation walls, basement walls, and pier blocks — fresh tubes are moist and dark; old tubes are dry and crumbly. Discarded wings near windowsills or light fixtures after spring rains indicate a recent swarm, often from a colony already inside the structure. Drywood termites leave hexagonal pellet-shaped frass — small, six-sided, sand-grain-sized — kicked out of small holes in infested wood. Tapping suspect wood with a screwdriver handle produces a hollow sound where workers have consumed the interior, even though the exterior surface looks intact.

Risk and Severity

Termites are among the costliest residential pests in the United States, causing several billion dollars in structural damage annually with most damage not covered by standard homeowner insurance. Subterranean termites can compromise sill plates, floor joists, structural beams, and load-bearing framing over months to years, often without external visual evidence. Drywood termites damage attic framing, eaves, exposed beams, and structural lumber in older homes. Damage progresses slowly but cumulatively, and a colony left active for several years can require tens of thousands of dollars in remediation including framing replacement, treatment, and finish repair. Risk scales with how long an infestation has been active, soil moisture conditions, wood-to-soil contact, and gaps in periodic professional inspection.

Solutions and Actions

Termite control should always involve a licensed professional with appropriate state credentials, not DIY treatment, because the products and application protocols are not consumer-grade and incomplete treatment allows continued damage. Subterranean termites are typically eliminated through either a continuous liquid termiticide barrier applied around the foundation or a baiting system using monitoring stations and toxicant-loaded bait around the perimeter. Drywood termites in localized infestations are treated by spot injection of foam, dust, or borate; whole-structure infestations require structural fumigation. Schedule annual professional inspections in active termite regions because early detection dramatically reduces damage and treatment scope. Coordinate any treatment with foundation drainage improvements, wood-to-soil separation, and moisture remediation to prevent reinfestation.

Prevention

Long-term prevention requires moisture control, wood-to-soil separation, and ongoing professional monitoring. Maintain at least a six-inch gap between soil grade and any wood siding, framing, or trim, and use pressure-treated lumber wherever wood approaches soil contact. Pull mulch back at least twelve inches from the foundation, store firewood off the ground and away from the house, and remove old stumps, buried wood debris, and form boards. Address drainage so soil near the foundation does not stay saturated — repair gutters, extend downspouts, and correct negative grade. Inspect for active leaks in roof, plumbing, and HVAC condensate lines annually. Schedule a licensed termite inspection every one to three years depending on regional pressure, and maintain any existing termite warranty or bond.

Frequently Asked Questions

What does termite frass look like compared to sawdust?

Termite frass consists of uniform, oval, six-sided pellets about the size of sand grains. Under magnification, each pellet has smooth, concave sides. Sawdust consists of irregularly shaped, fibrous wood shavings. The shape difference is immediately apparent under a magnifying glass.

Is termite frass dangerous to my health?

Termite frass is not toxic and poses no direct health risk from contact. In large quantities, airborne frass dust may irritate individuals with respiratory sensitivities. Standard household cleaning is sufficient.

Should I clean up termite frass before the inspector arrives?

Ideally, no. Leave frass undisturbed until a professional can examine it. The location, volume, and freshness help inspectors determine where the colony is active and plan targeted treatment.

Why does fresh frass reappearing after cleaning matter?

Fresh frass reappearing in the same spot means termites are still active in the wood above or nearby. Old pellets can remain after a previous infestation, but new piles show ongoing gallery cleaning and feeding. Photograph the pile, save a sample, and note how quickly it returned so the inspector can locate the active kick-out hole and choose a targeted treatment.