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Rodents

Roof Rat

Rattus rattus

Danger Level: 5/5Updated September 2026 · Boise, ID

IdentificationHow to Identify Roof Rat

Quick Answer

Roof rats are sleek, agile rodents with tails longer than their body. They've got dark brown to black fur, large ears, pointed noses, and bulging eyes.

Full identification notes

Their droppings are spindle-shaped with pointed ends, about 1/2 inch long. You'll also hear them called black rats or ship rats.

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Roof Rat Behavior & Habits

Understanding how roof rat behave helps prevent infestations

Roof rats are excellent climbers and stick to high ground.

More about their habits

They travel along tree branches, utility lines, and fence tops to reach your roof. They're less cautious than Norway rats, so they're easier to trap. They nest in attics, dense vegetation, and tree canopies, not basements or crawlspaces.

Roof Rat Risks & Dangers

What roof rat can do to your health and property

Health Risks

Roof rats carry leptospirosis, rat-bite fever, salmonella, and typhus, and they're the species historically tied to plague outbreaks.

Property Damage

Roof rats chew through wiring, insulation, and stored boxes in your attic.

Full health and property details

Health Risks

They contaminate food and surfaces with droppings and urine. Even a dead one in your attic can leave behind parasites and a smell that hangs around for weeks.

Property Damage

Gnawed electrical wires are a real fire risk, and attic fans, HVAC ductwork, and stored decorations can be wrecked in a single season. They'll also strip fruit off backyard trees overnight.

Signs of Roof Rat Infestation

Look for these indicators in your home

Signs You Have Roof Rat

What homeowners spot first

  1. Spindle-shaped droppings with pointed ends
  2. Sounds of running or scratching in attic
  3. Fruit with gnaw marks on trees
More signs to look for
  1. Gnaw marks on wires, wood, and stored items
  2. Greasy marks along rafters and beams
  3. Hollowed-out fruit or citrus

Roof Rat in Boise & the Treasure Valley

Roof rats are less common than Norway rats across the Treasure Valley, but we see them in older Boise neighborhoods like the North End, the Boise Bench, and around Hyde Park where mature trees brush up against rooftops.

More on what we see locally

They're also a regular call in Eagle and east Meridian properties with fruit trees or thick ivy on the walls. Most of our roof rat calls come in fall, once nights cool off and they push from the yard into warm attics. If your neighbor's been pulling apples off a backyard tree this year, expect company.

Our Solution

How We Handle Roof Rat

What our approach looks like

Roof rats travel high, so placement matters.

Our full approach

We set locked, tamper-resistant bait stations along their travel routes and plug the obvious gaps with copper mesh. We don't go into or treat attics, so the biggest thing you can do is trim back tree limbs and ivy that touch the house, which cuts off their highway in. If they show up between visits, we come back free.

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How to Prevent Roof Rat

Steps you can take to reduce the risk of infestation

  1. Trim tree branches away from roof (4+ feet)
  2. Install guards on utility lines
  3. Seal all openings larger than 1/2 inch
More prevention steps
  1. Remove fallen fruit promptly
  2. Store attic items in sealed containers
  3. Cap chimneys and vent pipes

Roof Rat Questions Answered

Common questions about identification, prevention, and treatment

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How do roof rats get in my attic?

Quick answerThey're agile climbers that reach attics by way of tree branches touching the roof, utility lines, vines on walls, or gaps at the roofline.

They can squeeze through openings as small as a quarter, so even a half-inch gap around a vent or chimney flashing is plenty.

How do I tell roof rat droppings from Norway rat droppings?

Quick answerRoof rat droppings are spindle-shaped with pointed ends, about 1/2 inch long.

Norway rat droppings are larger (around 3/4 inch) and blunt on the ends, more capsule-shaped. If you're finding them up on rafters, beams, or attic insulation, it's almost always roof rats. Norway rats stay closer to the ground.

When are roof rats most active around Boise?

Quick answerWe get the bulk of our roof rat calls in fall and early winter, once the nights cool off and they push from yards into warm attics.

They're year-round in the Treasure Valley, but September through December is when most homeowners first hear scratching above the bedroom ceiling. Neighborhoods with fruit trees or heavy ivy tend to see them earliest.

Think You Have Roof Rat?

Call and we'll talk through your options. We usually get out within 24 to 48 hours.

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