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Why Rodents Start Moving Indoors in October: A Recent Job & Some Homeowner Tips

Category: Holiday

Published: 06 Oct, 2026

By Rick, Owner, Ace Ventura Pest & Wildlife Control

What I Walked Into

October is when I start reminding homeowners around Greater Sacramento to pay closer attention to signs of rodents.

As nights get cooler and the season starts changing, mice and rats begin looking for protected places where they can find food, water, and shelter. Garages, attics, crawl spaces, sheds, and wall voids can give them exactly what they need.

Earlier this month, a homeowner called after hearing scratching sounds near the garage late at night. A few days before that, they had noticed a couple of droppings near some storage boxes but cleaned them up and did not think much of it.

When the droppings came back and a bag of bird seed had been chewed open, they knew something was getting into the garage.

I started my inspection inside the garage and found activity along the wall behind the storage area. Outside, I found a small opening near the garage that rodents could use to get inside.

The problem was still fairly early, which was good. This is exactly the kind of situation you want to catch before rodents become comfortable inside the home.

The Problem

Rodents do not suddenly appear indoors just because October arrives. In many cases, they have already been moving around the property during summer.

What changes is where they want to spend their time.

As outdoor conditions become less comfortable, garages, attics, and other protected spaces become more attractive. If rodents also find bird seed, pet food, trash, or another reliable food source nearby, they have even more reason to stay.

At this home, the garage gave them both an entry point and easy access to food.

The homeowner had only seen a few droppings, but those early signs were enough to show that rodents were regularly visiting the area.

The Process

I started by showing the homeowner where I had found the activity and the opening rodents were most likely using.

We addressed the entry point and checked the rest of the exterior for other gaps around the garage, vents, utility lines, and foundation.

Inside, the bird seed was moved into a sealed container, and we cleared some storage away from the walls so there were fewer protected hiding areas.

I then placed control measures in the areas where the activity was concentrated.

With rodent work, I do not want to focus only on the animal that's already inside. I also want to know how it got there and what made the property worth returning to.

Closing those opportunities is an important part of keeping the problem from starting all over again.

The Outcome

When I followed up, the homeowner had stopped finding fresh droppings in the garage and had not heard any more scratching at night.

They had also gone through the rest of their garage and moved pet food, bird seed, and a few other items into sealed containers.

The biggest difference was catching the activity early. The rodents had found a way inside, but they had not been given enough time to turn the garage into a regular nesting area.

The homeowner also knew what signs to watch for going forward. Instead of ignoring a few droppings or a damaged food bag, they understood that those can be the first clues that something is moving around the property.

That is especially important heading further into fall.

"It's brighter than before!"

— Megan

DIY Advice

Before I left, I gave the homeowner a few things I recommend checking around the house during October:

1. Look for gaps around garage doors, vents, utility lines, pipes, and the foundation.

2. Store bird seed, pet food, grass seed, and other food products in sealed containers.

3. Keep garages and sheds organized and avoid leaving boxes piled against walls.

4. Trim shrubs and vegetation that provide heavy cover directly against the house.

5. Clean up fallen fruit, spilled bird seed, and other food sources around the yard.

6. Watch for droppings, chew marks, nesting material, or scratching sounds, especially in garages and attics.

You do not need to completely empty your garage or inspect every inch of the house each week. Just knowing what to look for can help you notice a rodent problem much earlier.

Professional Insight

October is an important time for rodent prevention around Greater Sacramento because this is when outdoor conditions begin changing and rodents start looking for more protected places to stay.

A mouse does not need a large opening to get inside, and rats are good at finding weak spots around garages, rooflines, vents, and utility areas. Once they find reliable shelter and food, they can continue using the same route without homeowners realizing it.

That is why I recommend thinking about rodent control before you actually see one running through the garage.

A few droppings, scratching at night, damaged food packaging, or signs of chewing are all worth paying attention to.

Sealing entry points and removing easy food sources early can often prevent a small amount of activity from becoming a much larger problem later in fall and winter.

Closing Thoughts

A lot of the rodent calls I get in October begin with something small.

Someone hears scratching in the garage. They find a few droppings behind a box. A bag of bird seed suddenly has a hole in it.

Those signs are easy to brush off, but they are often the first indication that rodents have found a way onto the property or inside the home.

If you're in Greater Sacramento, October is a good time to walk around your home, check the garage and storage areas, and look for anything that could give rodents an easy way inside.

Catching those small signs now is much easier than dealing with an established rodent problem later.