The best electronic rat traps

Why the format suits rats specifically

The case for an electronic trap is stronger with rats than with mice, and it comes down to size and location.

A dead rat is a substantial animal. Releasing a spring bar over one, at arm's length, lying flat between attic joists with a flashlight in your mouth, is a genuinely unpleasant job — and because it is unpleasant, it gets postponed, and a sprung trap catches nothing while it waits.

An electronic trap removes that step. The rat dies inside a plastic tunnel, a light on the lid tells you from the hatch that there has been a catch, and you tip it into a bag without touching or seeing much of anything.

The secondary benefit is safety. The contact plates sit deep inside a tunnel that a dog's nose or a cat's paw cannot enter — geometry rather than careful placement, which is why they also appear on pet-safe rat traps.

What they do not change

They are not more lethal than a good snap trap. A full-size snap trap kills instantly when it fires. What you are buying is the handling, not the kill.

They are not immune to neophobia. A rat treats a new plastic tunnel exactly as warily as a new wooden trap. You still pre-bait for three to five nights with the trap switched off, then switch it on. Skip that and the trap sits there for a fortnight doing nothing.

They do not scale cheaply. Six electronic traps is a serious amount of money. The sensible pattern is two or three on the main runs where handling is worst, with snap traps covering the rest.

The failure modes, in order of how often they happen

Flat batteries. Rat traps run on C or D cells and drain them faster than the packaging implies, particularly in a cold attic. This fails silently — the trap looks armed and is not. Check the indicator weekly, and write the date you fitted the cells on the lid with a marker.

Damp. A crawl space with standing humidity corrodes the contacts within a season. If the space is genuinely damp, a snap trap inside a weatherproof box is the more durable answer — see outdoor rat traps.

Fouled plates. Peanut butter smeared where it can reach the contacts insulates them. Bait at the far end, past the plates, and prefer a design with a separate bait well.

A rat that backs out. Cheap copies with shallow chambers let a rat reach the bait from the entrance and withdraw. Chamber depth is the specification that actually differentiates these products.

Placing one in an attic

• On the joist run, not in the open insulation. Rats travel the top plate and the joists; a trap sitting in the middle of a bay is off the route.
• Tunnel mouth parallel to the direction of travel so the rat walks straight in.
• Level. A trap tilted on uneven insulation loses the geometry the plates rely on. Put a board under it if you need to.
• Near the droppings and the rub marks, which in an attic are usually along the edges where the roof meets the wall plate.
• Two of them, at opposite ends of the run, rather than one in the middle.

Rats in the attic covers the rest of the attic job, including the insulation question and when the noise means something other than rats.

Cleaning up safely

Attic and crawl space clean-ups are the situation where rodent-borne disease guidance actually matters, because the space is unventilated and the material is dry.

• Ventilate the space before you go in, and again while you work.
• Wear gloves. Do not sweep or vacuum droppings dry.
• Dampen droppings and nesting material with a disinfectant or a bleach solution, leave it five minutes, then lift with paper towel and bag it.
• Wash hands afterwards.

For a large quantity of droppings in a confined space, this stops being a do-it-yourself job and becomes a respiratory-protection one. The CDC guidance linked below is specific and worth reading before you start.