What’s the best bait for a mouse trap?

Peanut butter is the usual answer, and for good reason. But the best bait is often whatever the mice near you are already eating, and sometimes the best bait isn’t food at all. How much you use, and where you put it, matters as much as what it is.

Peanut butter, and why it works

The University of California’s pest guide calls peanut butter a popular choice because it’s easy to use and very attractive to house mice. It smells strong, and it sticks, so a mouse can’t pick up a piece and carry it off. It stays put on a trigger, and a jar lasts a long time.

The one reason to skip it is allergies. The same guide and the University of Nebraska both flag peanut butter as a risk for people with a peanut allergy. If that’s your house, use one of the foods below or a commercial non-allergenic mouse bait.

The food they’re already eating

“The best bait is often the food that house mice are already eating,” the University of California guide says. Look at what’s been chewed. In a garage it’s often birdseed, grass seed or dog food. In a barn or shed, it’s grain and feed.

Loose seeds are easy to take, so fix them in place. NC State Extension suggests using peanut butter or honey to stick other foods to the trigger. Press a few of the seeds they’ve been eating into a dab of peanut butter, and you have both.

Nesting material: a cotton ball or dental floss

Mice don’t only come for food. Females getting ready to have young are highly motivated to build nests, the University of California guide says, and a ball of cotton wool or dental floss can be an effective bait. NC State suggests baiting some traps with cotton balls or a ball of string for the same reason.

It works best when the mouse has to tug at it. Fix the cotton or floss to the trigger so it can’t be lifted off cleanly. The University of Nebraska suggests a cloth tied over the trigger with a food lure rubbed into it, so mice have to pull at the cloth to get it.

Other baits worth trying

• Chocolate or caramel. Both are on the University of Nebraska’s list. They’re soft enough to press onto a trigger.
• Canary grass seed. Whole canary grass seed is another bait on Nebraska’s list, and it’s sold as bird food.
• Butter, oatmeal and sugar. The bait in Leonard Mascall’s 1590 book, smeared on both sides of each vane of his mill to take mice. Fat, grain and sugar: the same things that make peanut butter work.

Use less than you think

A pea-sized dab is plenty. The University of California guide warns that with too much bait, a mouse may be able to eat it without setting off the trap. A small amount makes the mouse work for every bite. It also keeps the bait fresh longer, and there’s less to clean up.

Put it where the mouse has to commit

Bait only works if the mouse has to set off the trap to reach it.

• Snap traps: bait the trigger itself, and set the trigger lightly so the trap springs easily. Bait the trap first, then set it. Your fingers will thank you.
• Bucket traps: the bait goes on the part that moves, where the mouse can only reach it by stepping onto it. If it can reach the bait from the ramp or the rim, it eats and leaves. How bucket traps work goes through each design.
• Live-catch and tunnel traps: put the bait at the back, past the trigger or door, so the mouse has to go all the way in.

A trick from 1590: a little lure on the way in

Mascall’s book adds one more detail. Put a little oatmeal on the board, an inch from the mill, “to tice them to the mill”. A nervous mouse finds a small taste first, then the real bait just past it.

Our own setup guide uses the same trick. A tiny dab at the top of a bucket trap’s ramp, smaller than the bait on the trap itself, gets a mouse moving the right way. Keep it small. Any more, and it can eat there and leave.

If they’re not taking the bait

• Move the trap before you change the bait. Set traps close to walls, behind objects and near fresh droppings or chew marks. Mice seldom go more than about 30 feet from their nest and food, the University of California guide says, so space traps no more than about 10 feet apart where you see signs.
• Take away the competition. Pet food, birdseed and feed bags give mice an easier meal. Seal them up while you trap.
• Switch to nesting material. If food isn’t working, try cotton or floss on a few of the traps.
• Keep it fresh. Replace bait that’s dried out or covered in dust.

The bait on a Mascall Mill

Our trap is a modern take on Mascall’s 1590 mill. It clamps to a 5-gallon bucket, and each vane has bait holes for a pea-sized dab of peanut butter. The vane turns under a mouse and the next one comes round, still baited, so there’s nothing to set again. Our setup guide shows where the bait goes.