Peanut butter is the single most effective bait for catching rats. It combines fat, protein, and a hint of sweetness that appeals to both major species you’re likely dealing with. But the best choice depends on whether you have Norway rats or roof rats, and how you apply the bait matters just as much as what you use.
Why Rats Go for Certain Foods
Rats rely heavily on smell to find and evaluate food. Their olfactory system is finely tuned to detect calorie-dense options, and they’re naturally drawn to foods with strong aromas. In laboratory settings, peanut butter is actually used as the standard “attractive odor” when testing rodent behavior. This is why bland or low-calorie baits rarely work. You want something that fills the air around the trap with a rich, fatty, or sweet scent.
Best Baits for Norway Rats
Norway rats are the large, ground-dwelling species you’ll find in basements, along foundations, in woodpiles, and near garbage. They’re true omnivores with a strong preference for fatty and protein-rich foods. Your best options include:
- Peanut butter: the top pick because it’s sticky (hard to steal off a trigger), aromatic, and hits fat, protein, and sweetness in one bait
- Bacon: raw or cooked, the grease and salt are highly attractive
- Hot dogs: cheap, easy to attach to a trigger, and protein-rich
- Chocolate: a small piece works well as a sweet, high-calorie lure
If you’ve noticed the rats eating a particular food in your home (cereal, pet food, bread), that same food often makes excellent bait. Rats are creatures of habit, and something they’ve already been eating feels safe to them.
Best Baits for Roof Rats
Roof rats are smaller, darker, and tend to stay high. They climb trees, run along fences, and nest in attics or rafters. Their diet skews toward fruits, nuts, and seeds rather than meat and grease. If you live in a warmer climate and see signs of rats in elevated areas, you’re likely dealing with roof rats.
Sweet fruit works well for this species. They’re known for feeding on oranges and avocados right off the tree, sometimes hollowing out the fruit and leaving just the skin hanging. For trap bait, try dried fruit, fresh berries, nut meats, or a smear of peanut butter. The University of California’s pest management program recommends sweet fruit or nut meats specifically for roof rat traps mounted on tree limbs or elevated surfaces.
A Surprising Non-Food Bait
Female rats breed prolifically, producing six to eight litters per year, and they’re constantly gathering nesting material. String and dental floss are among their favorite finds. Cornell’s Integrated Pest Management program suggests tying a short piece of string or dental floss tightly around the base of a snap trap’s paddle. It works as bait, it never spoils, and rats will tug on it hard enough to trigger the trap. This is especially useful in spots where food-based baits dry out quickly or attract insects.
How Much Bait to Use
One of the most common mistakes is using too much bait. A rat can nibble a large glob of peanut butter from the edges of a trigger without putting enough pressure on it to spring the trap. Use a pea-sized amount, pressed firmly into the trigger mechanism or bait cup. The goal is to force the rat to work at it, pressing its nose or teeth directly against the trigger to get the food.
Pre-Baiting Makes a Big Difference
Rats are neophobic, meaning they have a genuine fear of new objects. A freshly placed trap in their territory is suspicious by default, and many rats will avoid it entirely for days. Pre-baiting solves this problem.
Place your traps with a generous amount of bait, but don’t set them. Let the rats find the traps and take the bait freely. Repeat this until they’ve taken bait roughly three times. By that point, the trap is a familiar, rewarding part of their environment. Then switch to a minimal, pea-sized amount of bait and set the trap. This patience dramatically increases your catch rate, especially with older, warier rats that have learned to avoid new things in their territory.
Bait Placement and Positioning
Even the perfect bait won’t work if the trap is in the wrong spot. Rats travel along walls, edges, and established runways. Place traps perpendicular to the wall with the trigger end touching the baseboard, so a rat running along its usual path steps directly onto the trigger. For roof rats, mount traps on the limbs, beams, or fence lines where you’ve seen droppings or rub marks.
Set multiple traps a few feet apart rather than relying on a single trap. Rats often dodge or jump over one trap but walk right into a second one placed nearby. And swap out bait every couple of days if it dries out or hardens, since stale peanut butter loses the strong scent that draws rats in from a distance.