How to Make a Homemade Trap for Large Rats That Holds

A homemade trap for large rats works best when it builds around a store-bought rat snap trap rather than replacing it: a board the trap is screwed to, a box that guides the rat head-first onto the trigger, and bait tied in place. Fully homemade designs, such as deep-bucket traps, hold big rats only if the container is far deeper than a standard bucket.

Why Large Rats Beat Most Homemade Traps

The large rats in homes are almost always adult Norway rats, which can weigh more than a pound. A heavy rat breaks flimsy parts, drags loose traps, and climbs or jumps out of containers built with mice in mind. Many popular homemade traps were designed for mice and simply scaled up.

Big adults are also often experienced. A rat that survives a weak trap learns to avoid it, so a homemade design that only injures can leave you with a rat that is both large and trap-shy. That is why the homemade parts that help most are the ones that make a proper rat trap fire squarely and stay put.

If you would rather buy a trap built for big rats, see our guide to the best rat traps for large rats. The traps for large and smart rats section also covers DIY setups for trap-shy rats.

Homemade Options for Large Rats Compared

The table compares the homemade approaches people try on large rats, from the most to the least dependable.

Upgrades That Make a Rat Trap Hold a Big Rat

These changes cost little, use scrap materials and fix the usual reasons big rats escape a store-bought rat trap.

• Screw the trap to a board: a heavy rat caught off-center can flip or drag a loose trap; a board, or screws straight into a floor joist, keeps it in place and focuses the snap.
• Tie the bait: fasten a nut or a strip of bacon to the trigger with thread or fine wire, so the rat must tug the trigger instead of licking bait off the edge.
• Put the bait at the back: a pea-sized amount at the far edge of the cup draws the head over the strike bar. What's irresistible to rats is usually the food they already eat, or peanut butter, nuts and bacon.
• Widen the trigger: glue a square of stiff plastic to a small trigger, so a big foot or nose cannot miss it.
• Set the trigger light: a stiff trigger on a heavy rat fires late, after the head has passed.

How to Make a Rat Trap for Big Rats

The most dependable homemade trap for big rats is a simple wooden runway box around two rat snap traps. The box walls make the rat walk straight down the middle, so it meets the trigger head-first, and the lid hides the traps from rats that have learned what a trap looks like.

1. Build a long box with a base, two sides and a removable lid, big enough for two traps end to end with room for the jaws to fire.
2. Cut an entry at each end at floor level, wide enough for a big rat; UGA's extension guidance describes holes about 3 inches across for rat bait boxes.
3. Screw both traps to the base, triggers facing the entries.
4. Place the box against a wall on a runway with droppings and rub marks.
5. Pre-bait with the traps unset until the bait is taken several nights running, then set both on the same night.

For a full build with a week-long pre-baiting plan, our guide to the DIY smart-rat box covers each stage in detail.

Can a Bucket Trap Hold a Large Rat?

Only with a much deeper container. A measured study of rodent jumping and climbing by federal wildlife researchers found rats jumping as high as 40 cm, about 16 inches, while a standard 5-gallon bucket is only about 14 inches deep. A big rat at the bottom of a bucket can reach the rim.

A tall, smooth-sided plastic trash can with a strong metal rod and roller can work, but the trap holds the rat alive, and live trapping comes with handling risks and, in some places, legal limits. Leave water out: drowning is not considered humane. For most people with a big rat, the board or box upgrades above are less work and more reliable.

What Is the Best Thing to Kill Big Rats?

A rat-size snap trap, set correctly and fastened down, is the quickest and most humane option for large rats; UC IPM calls snap traps the safest, most effective and most economical way to trap rats. Covered tunnel versions add safety where pets and children roam.

Poison is a poor choice in a house: rodenticides kill over several days, and poisoned rats often die inside walls and under floors. Glue boards are worse with big rats, since a large rat often pulls free and suffers, and homemade deadfalls and improvised springs tend to injure rather than kill.

Common Questions About Homemade Traps for Large Rats

Key Takeaways

Big rats escape homemade traps because those traps are too weak, too loose or too shallow. Fixing each of those with scrap wood, screws and thread is cheap and quick, and it turns an ordinary rat trap into one a heavy rat cannot drag or dodge. Deep-container traps can hold a big rat only if they are far deeper than a 5-gallon bucket, and they leave you with a live rat to handle.

Skip water, poison, glue and improvised killing mechanisms, which are cruel, slow or unreliable on big rats. If a large rat keeps escaping homemade setups, switch to a roomy store-bought rat trap and pre-bait it unset first.

Tonight, screw two rat traps to a board, lay it along the busiest wall and bait it unset.