In San Bernardino, rodents come from two directions: down from the foothills and up from the washes and flood-control channels that cut through the city. Add backyard fruit trees, palms and a long, warm season, and you have an area where rats and mice are active year-round. If you hear footsteps on the roof at night or find droppings in the garage, it is time to act.
Who is making the noise
Roof rats are the main attic invader in Southern California. Slim, with long tails and large ears, they climb fences, utility lines and palms, then enter along rooflines. Norway rats are heavier and burrow near drainage channels, behind dumpsters, under slabs and in dense landscaping. House mice infiltrate through tiny openings and live in garages, cabinets and wall voids. Pocket mice, woodrats and field mice occur near the foothills and may wander into properties adjacent to open land. Squirrels and opossums can also create noise, but different methods apply.
What attracts them to San Bernardino properties
Backyard citrus, pomegranate, fig and date palms supply food. Overgrown ivy, oleander and dense shrubs offer cover. Dry weather concentrates animals around irrigated areas and pet water bowls. Many older homes have stucco walls with cracks, clay tile roofs with open gaps, and eaves with deteriorated screens. Garages with worn door seals and sheds stacked with storage boxes provide nesting sites. Properties near Lytle Creek Wash, the Santa Ana River and other drainage corridors see more Norway rats, while foothill-edge homes see roof rats and native rodents. Wind-driven fire seasons can displace wildlife from burned areas toward neighborhoods.
Clues of activity in San Bernardino attics and garages
- Scratching or scampering sounds in attics or walls after dark.
- Droppings along beams, in the garage, or around pet food and bird feeders.
- Gnawed fruit in trees or on the ground.
- Dark, greasy trails along fences and beams.
- Chewed wires or insulation.
What licensed professionals do
Technicians inspect roof edges, vents, garage doors, utility penetrations and fences to determine entry points. They set snap traps in the attic and along runways and may place secured bait stations outdoors where permitted. Exclusion work uses metal flashing, hardware cloth, sealant and mortar to close gaps, as rodents chew soft materials. Trees and vines are trimmed back, and fruit is cleared. Sanitation and insulation replacement address droppings and odor. Since California restricts some rodenticides, many providers focus on trapping and sealing to avoid harming wildlife and pets.
Home and yard measures for San Bernardino properties
- Pick fruit as it ripens and remove anything on the ground.
- Trim palms and branches away from the roof by several feet.
- Store pet food and trash in sealed containers.
- Seal gaps at tile edges, pipes, vents and garage doors.
- Remove debris piles and unused items stacked against fences.
Who to contact
If you hear or see rodents, call (844) 725-1661. PestMinistry is a referral service. We connect San Bernardino callers with licensed independent providers who inspect, trap and seal.
How do I know it is a roof rat?
Spindle-shaped droppings near the attic and activity along rooflines point to roof rats.
Can rodents damage a car?
They sometimes chew wiring in parked vehicles, particularly near open space.
Is cleaning droppings risky?
Use gloves, a mask and disinfectant, and avoid sweeping dry droppings.
Why do rodents keep returning?
Unsealed entry points and attractive food or shelter keep drawing them.