The Edit — Home & Garden
Do Ultrasonic Pest Repellers Work on Mice
Mostly not. Mice get used to a repeated sound, ultrasound stops at the first piece of furniture, and the FTC has challenged claims for these devices since 1985. What keeps mice out is a sealed gap and a snap trap.
This guide is research-led: we have not handled these units ourselves. If you buy through our links we may earn a commission — it never changes a pick. How we choose
This page reads what US regulators and a university pest programme have published on ultrasonic repellers and peppermint pouches, and what they recommend instead, as How we choose describes. Nothing here was handled or tested.
Ultrasound stops at the first piece of furniture
A plug-in repeller sends sound in one direction, and that sound fades fast with distance and does not reach behind a sofa, a fridge or the back of a cupboard. Those are the places mice nest. The University of California’s Pest Notes add that mice quickly get used to a sound they hear every night, and find little evidence that any sound, magnetic or vibration device drives established mice out of a building.
So a repeller that seems to work for a week is usually the novelty wearing off. The mice were frightened, then they were used to it.
The FTC has challenged these claims since 1985
The claims the FTC challenged then were that a device eliminates an infestation, works as an alternative to traps or poison, or makes other methods work better. Read a repeller’s listing today with those 3 in mind.
Peppermint pouches skip the EPA’s review
Peppermint and peppermint oil are on the EPA’s list of minimum-risk active ingredients in 40 CFR 152.25(f), which exempts a product made only from listed ingredients from federal pesticide registration. The EPA’s own page says it generally does not review those products or their labels; the maker decides whether it qualifies. An exemption means the ingredient is low-risk, not that the pouch keeps mice away.
Rodent repellent pouches made 2 of the top 5 places in Amazon’s Home & Kitchen New Releases on 3 October 2026, as mice move indoors for autumn. The University of California notes they often come in when nights turn cold.
Sealing gaps wider than 1/4 inch is what lasts
Exclusion is the most successful and permanent way to control house mice, in the University of California’s words. A mouse can squeeze under a gap 1/4 inch tall and through an opening 3/8 inch wide. Plug small holes with coarse steel wool or wire screen; foam, rubber, vinyl and wood get chewed through.
| Method | What the sources say |
|---|---|
| Ultrasonic repeller | Mice get used to it; little evidence it drives them out (UC IPM) |
| Peppermint pouch | Exempt from EPA registration; not reviewed by the EPA |
| Sealing gaps over 1/4 inch | The most successful and permanent control (UC IPM) |
| Snap traps | Recommended by the CDC to reduce rodents at home |
| Glue and live traps | The CDC advises against them: a scared mouse urinates, raising the risk of disease |
Snap traps clear the mice already inside
The CDC recommends traditional snap traps for mice already in a house, and advises against glue traps and live traps. Set them along the walls with the baited end touching the wall, in a T, behind the stove and fridge and at the back of cupboards. A small dab of peanut butter is enough; too much lets a mouse lick it off without tripping the trap.
Mouse traps compared ranks snap, electronic and live-catch traps, with what owners report about each.
The CDC’s rule for when to stop is that one: a week with no catch and no new signs. Mice that come back after that have found another gap.