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If you live in Los Angeles, you've probably heard scratching in the walls at 2 AM, found small dark droppings in a kitchen drawer, or noticed something chewed through a bag of rice in the pantry. You're not alone. Rodents are one of the most persistent pest problems across LA County, and spring is when things tend to get worse.
Here at Squash Exterminating, we've been handling rodent problems for families and businesses across the greater Los Angeles area for over 15 years. This guide covers the rodent species you're most likely dealing with, how to identify the problem early, what actually works for prevention, and when it's time to call in a professional.
Los Angeles is essentially a rodent paradise. The mild year-round climate means there's no prolonged freeze to reduce populations the way there is in colder states. Add in the city's abundance of fruit trees — citrus, avocado, fig, and loquat — along with dense vegetation, aging infrastructure, and tightly packed neighborhoods, and you have ideal conditions for rodents to thrive.
The problem is especially pronounced in neighborhoods like Highland Park, Pasadena, Alhambra, and South Pasadena, where mature landscaping and older homes create plenty of food sources and entry points. But no part of LA County is immune — from Beverly Hills to East LA to Glendale, rodents are an equal-opportunity nuisance.
Spring makes things worse. March through May is peak breeding season for both rats and mice. A single pair of mice can produce up to 60 offspring in three months, and those offspring reach sexual maturity within six weeks. That means a small problem in March can become a full-blown infestation by June if left unaddressed.
Roof rats are the most common rat species in Los Angeles. They're sleek, dark brown or black, with a tail that's longer than their body. True to their name, they prefer high places — attics, rooflines, trees, and power lines are their highways. They're excellent climbers and can squeeze through a gap the size of a quarter.
You'll often find evidence of roof rats in attic insulation (look for tunneling or compressed trails), along the tops of fences and walls (greasy rub marks), and in fruit trees. If you hear scurrying overhead at night, roof rats are the most likely culprit.
House mice are smaller — two to three inches long with large ears and a dusty gray coat. They're less dramatic than rats but arguably harder to control because of how quickly they reproduce and how little space they need to enter your home. A gap the width of a pencil is enough.
Mice tend to stay closer to the ground and nest in wall voids, behind appliances, inside stored boxes, and in garage clutter. They're curious by nature and will explore new objects in their environment, which is actually why snap traps can be effective against mice — they investigate the trap rather than avoiding it.
Norway rats are less common in residential LA neighborhoods but worth mentioning. They're larger and stockier than roof rats, with shorter tails and brownish fur. They burrow underground rather than climb, so you'll find them near foundations, in crawl spaces, beneath concrete slabs, and around dumpsters in commercial areas like those throughout Monterey Park and Burbank.
Understanding entry points is the most important part of rodent control. You can trap and bait all you want, but if the entry points stay open, new rodents will move in within days. Here are the most common entry points we see in LA homes:
Roofline gaps. Where the roof meets the fascia board, there are often gaps — especially in older homes throughout Pasadena, Glendale, and Highland Park. Roof rats exploit these gaps routinely. Even a half-inch opening is enough.
Utility penetrations. Where plumbing, electrical conduit, gas lines, and cable wiring enter the house, there's almost always a gap. These are some of the most overlooked entry points, particularly along the foundation line.
Garage doors. The weatherstripping along the bottom of garage doors deteriorates over time. If you can see daylight under the door, mice can get through.
Dryer and bathroom vents. Exterior vent covers with broken or missing louvers are essentially open doors for rodents. The warm air flowing out of dryer vents is particularly attractive.
A/C line entry points. The gap where the refrigerant line enters the wall is rarely sealed properly. We see this one constantly.
The single most effective rodent control strategy is exclusion — physically sealing every entry point into your home. This is the approach we prioritize at Squash Exterminating because it solves the root cause rather than managing symptoms. Exclusion work typically involves sealing gaps with steel wool backed by caulk, installing hardware cloth over vents, replacing damaged weatherstripping, and closing off roofline gaps with galvanized metal flashing.
Rodents are opportunistic feeders. In LA, the biggest outdoor food source is fallen fruit. If you have citrus, avocado, fig, or loquat trees — and many properties in Alhambra, South Pasadena, and Beverly Hills do — pick up fallen fruit daily. Don't leave it on the ground overnight.
Indoors, store dry goods in glass or heavy plastic containers with tight lids. Don't leave pet food out overnight. Keep garbage bins sealed, and if you compost, use a rodent-resistant tumbler rather than an open pile.
Rodents need shelter as much as food. Dense ivy, overgrown hedges, wood piles against the house, and cluttered garages all provide cover. Trim vegetation so there's at least a 12-inch clear zone along your foundation. Store firewood at least 20 feet from the house and elevated off the ground. Keep garage and storage areas organized — plastic bins on shelving beat cardboard boxes on the floor every time.
This is one of the simplest and most overlooked prevention steps. Roof rats are agile climbers and will use tree branches as a bridge to your roofline. Trim all branches back at least four feet from the house. Pay special attention to palm trees, which roof rats use as nesting sites, and any tree that overhangs the roof.
If you already have rodents inside, prevention alone won't solve the immediate problem. You'll need to reduce the existing population before exclusion work is fully effective.
Snap traps remain one of the most effective tools for both rats and mice. Place them along walls with the trigger end facing the wall, since rodents travel along edges. Peanut butter is a reliable bait. For mice, place traps every five to ten feet along active runways. For rats, fewer traps placed strategically near droppings and rub marks work better.
Bait stations are tamper-resistant boxes that hold rodenticide. They're most appropriate for outdoor use around the perimeter of your property. If you use them, always use a locked bait station — never loose bait — to protect children, pets, and wildlife. Many homeowners prefer to leave bait stations to professionals for this reason.
DIY methods are reasonable for a mouse or two, but there are situations where professional rodent control is the smart move. Call a licensed pest control company if you're experiencing any of the following:
A professional inspection identifies the species, locates entry points you may have missed, and develops a treatment plan that combines trapping, exclusion, and sanitation. At Squash Exterminating, we emphasize integrated pest management — using the least amount of chemical product necessary and focusing on long-term prevention through exclusion and habitat modification.
At Squash Exterminating, we offer free rodent inspections for homeowners and businesses across Los Angeles County. As a family-owned company, we treat your home the way we'd treat our own — with care, thoroughness, and an emphasis on eco-friendly solutions that keep your family and pets safe.
Whether you're dealing with scratching in the attic, droppings in the kitchen, or just want to rodent-proof your home before spring breeding season kicks into high gear, we're here to help. We serve Los Angeles, Pasadena, Beverly Hills, Glendale, Burbank, Alhambra, Monterey Park, South Pasadena, East LA, Highland Park, and the surrounding communities.
Call us at (323) 855-3567 or visit squashpestca.com to schedule your free rodent inspection today.
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