How to Get Rid of Roof Rats in Southern California

Roof rats are the climbing rats that dominate Southern California, and they get into homes through the roof. To get rid of them, trim back the branches and vegetation they climb, trap the active rats, and seal every gap along the roofline and vents. Cutting off access is what keeps them gone.

If you live in Los Angeles or Ventura County and you have rats, they are almost certainly roof rats. Unlike the ground-dwelling Norway rat, the roof rat is a climber that thrives in Southern California’s mild climate, fruit trees, and dense landscaping. It reaches your attic from above, which changes how you have to deal with it. Here is how to get rid of roof rats and keep them out.

Know what you are dealing with

Roof rats are slender, dark, and agile, with big ears and a tail longer than their body. They are excellent climbers and prefer to nest high: in attics, upper walls, garages, palm trees, and dense ivy. They are also cautious, which means rushing the job or moving traps too soon tends to backfire. Understanding their habits is half the battle.

Cut off their access

Because roof rats travel from above, your yard is part of the problem. Do this first:

• Trim tree branches so none touch or overhang the roof (roof rats jump surprisingly far, so leave a gap of several feet)
• Cut back dense ivy, shrubs, and vines climbing walls and fences
• Pick up fallen fruit and secure pet food, bird seed, and compost
• Keep firewood and clutter off the ground and away from the house

Removing these highways and food sources makes your home dramatically less attractive and makes every other step work better.

Trap the active rats

Snap traps placed along roofline runways, in the attic, and where you see droppings are the most effective and controllable method. Roof rats are neophobic, meaning they avoid new objects at first, so it is worth leaving unset traps in place for a few days before arming them. Skip poison bait: a poisoned roof rat often dies in a wall or attic, and secondary poisoning is a serious risk to the hawks, owls, and pets that hunt rodents across our region.

Seal the roofline

Roof rats need only about a half-inch gap to get in. Once you have removed the active rats, seal every opening along the roof and exterior: eave and fascia gaps, unscreened attic and gable vents, and gaps around chimneys, pipes, and utility lines. Use galvanized mesh, hardware cloth, and sealant matched to each spot. This roofline exclusion is the core of our rodent proofing service and the reason our fixes last.

Clean up the attic

Roof rats foul the attic with droppings, urine, and nesting, which is both a health hazard and a scent trail that draws new rats. Remove soiled insulation, sanitize, and neutralize the odor with attic decontamination, and replace ruined insulation through our attic cleanup and insulation service. The CDC recommends careful, wet cleanup of rodent waste rather than dry sweeping (see the CDC’s rodent guidance).

What you can handle vs. when to call a specialist

Trimming trees, removing yard attractants, and setting traps are all things a motivated homeowner can do. Sealing a full roofline safely and finding every hidden gap is harder and often requires ladder work and experience. If roof rats keep returning, or you are facing attic contamination, a professional exclusion and cleanup is the reliable fix.

We handle roof rats end to end, removal, roofline sealing, and cleanup, across West Los Angeles, San Fernando, Ventura, and the surrounding areas. Call (310) 294-8659 for a free inspection.