Closing Up Your White Mountains Cabin for Winter: A Rodent-Proofing Checklist

Quick answer: To keep mice and pack rats out of a White Mountains cabin over winter, seal every gap 1/4 inch or wider with steel wool, hardware cloth or metal, take all food and pet food home, store bedding in sealed bins, check vehicles and sheds, and set up monitoring before the first hard freeze.

Mid-October is when the high country turns. On October 13, 2026, the National Weather Service in Flagstaff issued a freeze warning for the western Mogollon Rim above about 6,000 feet, and cold nights like these are what push mice and pack rats indoors. For a lot of White Mountains owners, this is also close-up season, when the cabin gets locked up and they head back to the Valley.

That's a big group. U.S. Census Bureau estimates (ACS 2020–2024, Table B25004 and Table B25001) put homes held for seasonal or occasional use at about 56% of housing units in Heber-Overgaard and 33% in Pinetop-Lakeside. Many of those cabins sit empty for weeks or months, and a quiet cabin is exactly what a rodent is looking for.

Here's the checklist we'd follow before locking the door for the season in Pinetop-Lakeside, Heber-Overgaard, Greer, Show Low or anywhere else on the mountain.

Why do mice and pack rats move into cabins in the fall?

As nights get cold, rodents leave outdoor nests for sheltered spaces that have food and quiet, and an empty cabin has both. Our fall rodent prep guide covers the timing: in the White Mountains the push starts earlier and lasts through winter.

It matters for more than chewed cushions. Deer mice can carry hantavirus. As of August 9, 2024, the Arizona Department of Health Services reported nine confirmed Arizona cases that year, including three deaths, across Apache, Coconino, Navajo and Pima counties. ADHS specifically calls out second homes that aren't used year-round. And pack rats (woodrats) are their own problem: University of Arizona Extension notes they nest in the engine compartments of vehicles that don't get driven much.

How do I keep mice and pack rats out of a vacant cabin?

Start outside, because sealing the way in does more than anything you leave inside. The CDC says a mouse can fit through a hole about the width of a pencil, 1/4 inch.

Outside checklist

• •Walk the foundation and crawlspace. Look where pipes, wires, gas lines and the dryer vent come through the wall, and at crawlspace and gable vents. Seal anything 1/4 inch or larger.
• •Use materials rodents can't chew. The CDC recommends steel wool held in with caulk or spray foam for small holes, and lath screen, hardware cloth, metal sheeting or cement for larger ones. ADHS adds thick wire screen and metal flashing.
• •Check the skirting. On manufactured homes and trailers, the CDC advises fixing gaps in skirting and using flashing around the base.
• •Fit door sweeps on exterior and garage doors. Garage door corners are one of the most common ways in.
• •Move woodpiles, lumber and clutter. ADHS recommends moving woodpiles, lumber and junk as far from the house as possible.
• •Take down bird feeders or move them well away from the cabin, and don't leave trash behind. The CDC recommends thick plastic or metal cans with tight lids.

What should I take out of the cabin before I leave?

Anything a rodent can eat or nest in. The CDC lists food and water sources as the main draw.

Inside checklist

• •Take the food home. Pantry goods, pet food, birdseed, even the box of crackers in the drawer. Anything that has to stay goes in thick plastic, metal or glass containers with tight lids (CDC).
• •Clean up crumbs and spills, wash the dishes and empty the trash before you go.
• •Bag the bedding. Store linens, pillows and blankets in sealed bins, and don't leave stacks of cardboard or paper, which make easy nesting material.
• •Look for signs you already have company. Droppings, gnaw marks and shredded nesting material in drawers or under sinks mean rodents are already inside. Our post on the signs of mice in an Arizona house shows what to look for.

Why are pack rats nesting in my car engine?

Because it's warm, dark and nobody disturbs it. A truck, RV, trailer, ATV or boat left at the cabin all winter is the "seldom-driven vehicle" UA Extension warns about.

Vehicles and outbuildings checklist

• •Look under the hood of anything you're leaving behind, and check again when you come back before you start it.
• •Seal the shed and garage too. The CDC says outbuildings and garages need the same sealing as the house.
• •Don't store feed, seed or pet food in the shed over winter.

If you already have a pack rat problem, our pack rat control page for Show Low and the White Mountains explains how we remove nests and keep them out.

Should I leave traps or poison in an empty cabin?

Usually not on their own. The CDC recommends snap traps, says to check them every day, and says to use poison or bait stations only for infestations that keep coming back. Nobody is checking traps daily in a cabin that's empty until May, and poison inside can leave you with dead rodents in the walls.

That's the gap a fall service fills. On a fall rodent visit, Hydra inspects the full exterior for entry points, seals openings with steel wool, hardware cloth and rodent-grade sealant, sets tamper-resistant bait stations outside, places monitored snap traps inside, and comes back to confirm the activity has stopped.

Can someone check on my cabin while I'm in Phoenix?

Yes. As one cabin owner asked when they called us, "We're still gonna be on schedule quarterly, right, even if we're not here?" Hydra's White Mountains branch at 1080 N 16th St in Show Low runs cabin and second-home pest control built for owners who live off the mountain:

• •You give us your gate code or lockbox access once, and we service the property on schedule.
• •Background-checked, state-licensed technicians do every visit.
• •You get notes and photos from each visit, plus GPS confirmation that the technician was on site.
• •We never leave door hangers or paperwork on the doorstep, so nothing signals that the cabin is empty.
• •Vacation-rental hosts can schedule service around bookings.

Hydra is locally owned and operated and licensed and insured in Arizona (AZ license #9790). We serve Show Low, Pinetop-Lakeside, Heber-Overgaard, Snowflake, Taylor and the Round Valley area, including Eagar, Springerville, Greer and Alpine. Call or text (928) 457-2481, or request a free custom quote for your cabin.

What should I do when I open the cabin in spring?

Air it out before you clean. ADHS says to open doors and windows for 30 minutes first, never sweep or vacuum droppings, soak droppings and nests with disinfectant (or one part bleach to nine parts water) for at least 15 minutes, wipe them up with gloves and disposable materials, and double-bag the waste. If you find heavy droppings or a pack rat nest, call us before you disturb it.

FAQ

When should I close up my cabin for mice and pack rats?

Before the first hard freeze, so keep an eye on the NWS Flagstaff forecast. This year the NWS issued a freeze warning for the western Rim on October 13. Seal entry points and remove food while the weather still lets you work outside, and schedule any fall rodent service before you leave for the season.

How small a gap can a mouse get through?

About 1/4 inch, roughly the width of a pencil, according to the CDC. That's why every gap that size or larger needs to be sealed with steel wool, hardware cloth, metal or cement.

Do mice come back to the same cabin every winter?

Often, yes, because the openings, shelter and food that drew them in are still there. We answer this in more detail in Do mice come back to the same cabin every winter?

Is it safe to clean up mouse droppings in a cabin that's been closed all winter?

Only with care. Follow ADHS guidance: air the cabin out for 30 minutes, don't sweep or vacuum, soak droppings with disinfectant for at least 15 minutes, and wear gloves. For heavy contamination, call a professional.

Do you service cabins in Heber-Overgaard, Pinetop-Lakeside and Greer?

Yes. Hydra's White Mountains branch in Show Low services cabins and second homes across Pinetop-Lakeside, Heber-Overgaard, Greer and nearby communities, with gate-code or lockbox access and photo reports while you're away.

How much does it cost to rodent-proof a cabin?

It depends on the cabin, the outbuildings and how long it sits empty, so we don't use one-size-fits-all pricing. Call or text (928) 457-2481 for a free custom quote.

Sources

• •National Weather Service, Flagstaff office (freeze warning for the Mogollon Rim, Oct. 13–14, 2026)
• •CDC: How to Seal Up to Prevent Rodents
• •CDC: How to Trap Up to Remove Rodents
• •Arizona Department of Health Services: Protect Yourself from Hantavirus Pulmonary Syndrome
• •University of Arizona Extension: Woodrats
• •U.S. Census Bureau, ACS 2020–2024 5-year, Table B25004 Vacancy Status and Table B25001 Housing Units