Termite Frass: What It Looks Like and What It Means

Tiny piles of what looks like sand, sawdust or coffee grounds appear under a wooden window or beside a cupboard. It could be frass, the droppings and debris left by wood-eating insects. Identifying it correctly tells you which pest you have.

This guide explains what termite frass looks like and what it means.

The short answer

Termite frass is the waste material pushed out of galleries by termites, most commonly drywood termites, and it looks like small, hard, six-sided pellets with ridges, often in tiny piles that resemble sand or coarse sawdust and may be varied in colour depending on the wood eaten. Subterranean termites usually do not leave visible frass because they use it to build mud tubes and line galleries. Frass is different from the fine, flour-like powder left by wood borer beetles. Finding frass indicates active infestation and warrants an inspection.

What termite frass looks like

• Tiny pellets, about a millimetre long, with a distinct shape and ridges.
• Colours range from pale to dark brown, depending on the wood.
• Found in small mounds below holes, on window sills, floors and shelves.
• Pellets are hard and do not crush easily, unlike powder.

Frass compared with other debris

1. Drywood termite frass: Hard, ridged pellets, in small piles.
2. Wood borer frass: Fine, flour-like powder, often packed into tunnels.
3. Carpenter ant debris: Coarse shavings, often with insect parts.
4. Sawdust from work or wear: Irregular, with no pellet shape.

Why you may not see it

Subterranean termites, the more common type in many Indian homes, use their waste to build tunnels and seal galleries. In those cases the signs are mud tubes, hollow wood and bubbling paint, not frass.

Where to look

• Below wooden doors, windows and frames.
• Under or inside wardrobes and furniture.
• Along skirting boards and floors.
• In window sills and on shelves.

What to do

1. Collect a small sample in a clean container.
2. Photograph the pellets and the spot where they appeared.
3. Check whether new frass appears after cleaning. Fresh piles mean active termites.
4. Look for holes where the pellets are pushed out.
5. Book an inspection.

When to call a professional

If frass reappears after you clean it, the infestation is active. A specialist can identify the species and recommend treatment.

Frequently asked questions

Does frass always mean termites?

Not always. Borer beetles and carpenter ants also leave debris, so identification matters.

Is frass harmful?

It is not toxic, but clean it with a mask and gloves, as dust can irritate some people.

Can I treat it myself?

Cleaning helps you monitor, but treatment needs a professional.

Why does it keep coming back?

The insects are still active inside the wood.

This guide is part of IPest's complete resource on termite control. For identification help, prevention and treatment options, see our full termite treatment guide for Bangalore.