September 17, 2025

Signs of Rodent Activity

If you’ve ever heard scratching in your walls at night or found mysterious droppings in the pantry, you’re not alone. Rodents are one of the top pest problems for homeowners in Northern California. While their activity ramps up in the fall as cooler weather drives them indoors, the truth is that every season can be “rodent season” here. From roof rats in attics to mice sneaking through tiny foundation gaps, these pests always look for a way inside.

Catching the early signs is key to stopping an infestation before it gets out of control. That’s why Big Time Pest Control has put together this guide so you can recognize the signs of rodents, understand the risks they bring, and know when it’s time to call in the pros.

rodent nest in a box

​If you’ve ever heard scratching in your walls at night or found mysterious droppings in the pantry, you’re not alone. Rodents are one of the top pest problems for homeowners in Northern California. While their activity ramps up in the fall as cooler weather drives them indoors, the truth is that every season can be “rodent season” here. From roof rats in attics to mice sneaking through tiny foundation gaps, these pests always look for a way inside.

Catching the early signs is key to stopping an infestation before it gets out of control. That’s why Big Time Pest Control has put together this guide so you can recognize the signs of rodents, understand the risks they bring, and know when it’s time to call in the pros.

Common Rodent Species

House Mice

House mice are the most common rodents that get inside homes in Northern California. They are small with grayish-brown bodies and creamy underbellies. House mice thrive indoors, often nesting in wall voids, attics, and storage areas.

Deer Mice

Deer mice are slightly larger than house mice and have whiter underbellies. They are also less likely to appear inside, but that doesn’t mean they never infest homes. They’re most likely to nest in dark, cluttered spaces when they get indoors.

Norway Rats

Norway rats are large rats with heavy bodies. Sometimes called sewer rats, they usually stick to the ground levels of homes, nesting near foundations or inside basements. They are especially common in heavily populated areas.

Roof Rats

Roof rats are thinner than Norway rats and are excellent climbers. They are usually found in the upper levels of homes, nesting in attics and rafters.

Signs of Infestation

Rodents rarely move in quietly. In fact, they usually leave behind plenty of clues that give them away. The challenge is knowing what to look for. Here are the most common signs of rodent activity in Northern California homes:

Droppings

Tiny, dark, rod-shaped droppings are a telltale sign of mice, while rat droppings are larger with blunt ends. You’ll often spot them near food sources like the kitchen or pantry. Both are dark in color.

Gnaw Marks

Rodents chew constantly to keep their teeth from overgrowing. Look for gnaw marks on food packaging, wires, wood, and even pipes.

Noises in the Night

If you hear scampering, scratching, or squeaking in the walls or attic after dark, chances are you’ve got company.

Nesting Materials

Shredded paper, insulation, or fabric tucked into hidden spaces (behind boxes, under appliances, in the attic) are signs rodents are making themselves at home.

Grease Trails and Smudge Marks

Rats and mice often run along walls and baseboards, leaving behind greasy rub marks from their fur.

Footprints and Tail Marks

You might see small footprints or tail drag marks in dusty areas like the basement or garage.

Sightings

Seeing a live or dead rodent is the most obvious sign and usually means there are more hiding out of sight.

Health & Property Risks

Rodents aren’t just a nuisance; mice and rats threaten your home and health.

Rodent Prevention Tips

The best way to deal with rodents is to keep them out in the first place. Northern California’s mix of cooler nights, rainy winters, and long dry summers means rodents always seek shelter, water, and food. A few simple steps can go a long way toward making your home less inviting:

When to Call the Pest Control Professionals

Sometimes it’s hard to know when to handle a pest problem yourself and when to call in the experts. With rodents, acting quickly makes all the difference. Here are a few situations where calling Big Time Pest Control is the smart move:

If any of these sound familiar, it’s time to let trained professionals step in. Big Time Pest Control has the tools, knowledge, and experience to eliminate existing rodent activity and keep them out.

Why Hire Our Local Pest Control Company for Your Rodent Problem

Rodent control in Northern California can be tricky. Roof rats, Norway rats, and mice each behave differently, and DIY methods like traps or baits often don’t solve the root of the problem. That’s where Big Time Pest Control comes in.

Here’s why homeowners across NorCal trust us to keep their homes rodent-free:

What to Expect from Big Time Pest Control

Early action makes all the difference. If you’ve noticed signs of rodents in your Northern California home, don’t wait; contact Big Time Pest Control today!

What Big Time Pest Control Customers Are Saying

big time customer in anderson california

Martin is an asset to your company! He’s very friendly and thorough and very helpful with any questions or concerns that we might have. I am very satisfied with the service he provides. Thank you to Martin and Big Time!!!!

Wayne L.

Anderson, CA

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Jamie from Big Time Pest Control is the "BEST!" He calls to let me know he is on his way. He listens to any bug/rodent concerns I have, then does a very thorough treatment of my entire property! Thank you Jamie and Big Time for training your team in such a thorough manner!

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Anderson, CA

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Matt is always very thorough and willing to answer questions. He’s also the first person our dog is willing to take treats from. My dog likes you, and you get rid of my ants—that’s a win-win in my book. Thanks, Matt!

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Mt. Shasta, CA

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