Roof rats are omnivores with a strong preference for plant-based foods, especially fruit. Unlike Norway rats, which gravitate toward meat and garbage, roof rats are primarily fruit and nut eaters. This distinction matters if you’re trying to figure out what’s raiding your garden or how to bait a trap effectively.
Fruits and Nuts Are Their Primary Diet
Roof rats are sometimes called “fruit rats” for good reason. Oranges, avocados, lemons, figs, dates, and other tree fruits make up a large portion of their diet. They’re skilled climbers, so fruit hanging high in the canopy is just as vulnerable as fruit near the ground. They also eat a wide range of nuts, including almonds, walnuts, and pecans.
In the wild or in rural areas, roof rats rely heavily on seeds, berries, and other plant material. In suburban neighborhoods, fruit trees and nut trees are the single biggest attractant. If you have a citrus or avocado tree and you’re finding damage, roof rats are a likely culprit.
What They Eat Around Your Home
Beyond fruit trees, roof rats readily eat pet food, birdseed from feeders, and stored pantry goods like cereal, grains, and dried fruit. Pet food left outdoors overnight is one of the most common food sources that draws them close to homes. Birdseed is another major one, especially in feeders that spill seed onto the ground.
Inside a home or garage, they’ll chew into bags of rice, oats, pasta, and other dry goods. They eat vegetables from gardens, too, though they’re far more attracted to fruit. Compost bins with exposed food scraps and unsecured garbage cans also provide easy meals.
Insects, Snails, and Other Protein Sources
While fruit and nuts come first, roof rats supplement their diet with insects, slugs, and snails. This protein intake is a smaller part of their overall diet compared to plant foods, but it’s consistent. They’ll also eat bark, fungi, and other plant tissue when preferred foods are scarce. In agricultural settings, they’ve been known to girdle tree limbs (chew the bark in a ring around a branch), which can kill entire sections of a tree.
How to Tell Roof Rats Are Feeding in Your Yard
The most recognizable sign is hollowed-out fruit still hanging on the tree. Roof rats typically gnaw a hole in one side of a citrus fruit, eat the interior, and leave the empty rind dangling from the branch. This is a signature behavior. If you’re finding intact-looking oranges or lemons on the tree that turn out to be hollow shells, roof rats are almost certainly responsible.
Other signs include gnaw marks on nuts (often with irregular, rough-edged holes), droppings near fruit trees or feeding stations, and greasy rub marks along fences, walls, or branches where the rats travel the same routes repeatedly. You may also notice partially eaten avocados on the ground with distinctive tooth scrapes in the flesh.
Best Bait Choices for Traps
Because roof rats prefer fruit and nuts over meat or cheese, your trap bait should reflect that. Peanut butter is the most consistently effective option. Dried fruit, fresh banana slices, raisins, and nutmeats also work well. The University of Arizona Cooperative Extension recommends tying or gluing bait to the trap trigger with string, dental floss, or fine wire so the rat can’t simply pull it free.
A useful strategy is to match the bait to whatever the rats are already eating in your yard. If they’re feeding on citrus, use orange slices. If they’re raiding a bird feeder, try sunflower seeds. Pre-baiting (setting out loaded but unset traps for a few days) lets the rats get comfortable feeding at the trap location before you activate it, which significantly improves catch rates.
Reducing Food Sources Around Your Property
Removing access to food is the most effective long-term strategy for keeping roof rats away. Pick ripe fruit from trees promptly and collect any fallen fruit from the ground daily. Store pet food in sealed containers and bring outdoor pet bowls inside at night. Use bird feeders designed to minimize seed spillage, or remove feeders entirely if you’re dealing with an active rat problem.
Keep garbage cans tightly sealed, and if you compost, use a fully enclosed tumbler rather than an open pile. Trim tree branches that overhang your roof or fences, since roof rats use these as highways between food sources and nesting sites. Even a single fruit tree in a neighbor’s yard can sustain a local population, so managing your own property’s food availability is about making your home less attractive relative to other options in the area.