How to Winterize Your Enclosed Trailer
Putting an enclosed trailer away for winter without prepping it is how you get flat spots, rotted floors, and seized bearings by spring. Here is how to do it right.
February 23, 2026 · 7 min read
Winterizing an enclosed trailer is not complicated, but skipping it costs real money. A trailer that gets parked wet, aired down, and forgotten comes back in spring with flat-spotted tires, a musty rotted floor, corroded lights, and bearings that grind. None of that had to happen. An hour or two before you tuck it away protects everything and makes the spring wake-up quick. Whether you tow through Georgia winters or you are storing a trailer that only comes out in warm weather, here is the process we recommend at Outlaw Supercenter.
Start With a Clean, Dry Trailer
Moisture is the number one enemy of a stored trailer. Anything you seal inside is going to stay there for months, so put it away dry. Sweep it out, wipe down any damp spots, and leave it open to air out on a dry day before you close it up. If the floor got wet during the season, get it fully dry before storage, because trapped moisture against a wood floor is exactly how rot starts.
Protect the Tires
Tires take the worst of long-term storage. A tire sitting in one spot under load slowly develops a flat spot, and cold pavement makes it worse.
- Inflate every tire to the full cold PSI listed on the sidewall before storage.
- Move the trailer a few feet every few weeks if you can, to change the contact point.
- Park on wood or a tire mat instead of directly on cold concrete or bare dirt.
- Keep tires out of direct sun, since UV cracks rubber even in cold weather.
- Remember that tires age out around five to seven years regardless of tread left.
Grease the Bearings Before It Sits
Wheel bearings that sit all winter with old, thin, or contaminated grease can develop surface rust that ruins them. If your bearings are due, do the grease or repack in the fall before storage rather than in the spring. Fresh grease coats the bearing surfaces and pushes out moisture, giving you clean protection through the cold months.
Seal Out Water and Critters
An enclosed trailer is a warm, dry, hidden box, which makes it a favorite winter home for mice and other pests. It is also a target for water if the roof seams have any gaps.
Check the Roof and Seams
Walk the roofline and look at every caulked seam. Reseal anything cracked, lifted, or missing with a proper roof sealant before the first freeze. Water that gets in and freezes will widen a small gap into a big one, and a leaking roof over a stored trailer means a rotted floor by spring.
Block the Entry Points
Close every vent and door tightly and check the seals around them. If you have had mouse trouble before, steel wool packed into gaps and a few traps or repellent inside go a long way. Chewed wiring is one of the most common and most annoying storage-season repairs we see.
Manage Moisture Inside
Even a sealed trailer breathes a little, and temperature swings cause condensation on the inside of the walls and roof. That moisture has nowhere to go in a closed box.
- 1Place moisture absorbers or a bucket of desiccant inside before you close it up.
- 2Crack a roof vent slightly if your trailer has one, to allow airflow.
- 3Leave interior cabinets and any storage boxes open so air can circulate.
- 4Do not store anything damp, and never leave wet gear or tarps folded inside.
Battery, Brakes, and Final Steps
If your trailer has electric brakes and a breakaway system, the small battery that powers it will drain and can be ruined by a deep discharge in the cold. Pull it, charge it, and store it somewhere it will not freeze, then top it off before spring. Chock the wheels, leave the trailer level so nothing pools, and if it lives outside, a breathable cover beats a plastic tarp that traps condensation against the roof.
Where You Store It Matters
The spot you choose changes how much prep you need. Indoor storage in a barn or shed is the gold standard, since it keeps sun, rain, and freeze-thaw cycles off the roof and tires entirely. If indoor is not an option, a covered lean-to or even the north side of a building shields the trailer from the worst of the sun. Parked out in the open is workable too, but it demands more from your seals and your cover. Whatever you choose, get the trailer off soft ground if you can, because a trailer that sinks into wet dirt over winter comes out with rusted brake hardware and tires that sat in standing water. A few boards or pavers under the tires keep it up out of the mud.
You do not store a trailer for the winter. You store it for the spring, so leave it the way you would want to find it on the first warm Saturday.
Come spring, reverse the process. Air the tires to spec, check the bearings, reinstall the charged battery, test every light, and do a slow shakedown drive before you trust it with a load. If any of it looks tired, worn, or beyond a quick fix, our shop keeps tires, bearings, seals, lights, and sealant in stock and can get you sorted fast. And if the trailer served its time and you are ready for something new, we have over 200 Diamond Cargo and Xtreme Cargo trailers on the lot with financing for all credit types. Call Outlaw Supercenter at (800) 281-5084.
Frequently Asked
Should I air down my trailer tires for winter storage?+
No. Inflate them to the full cold PSI on the sidewall. An underinflated tire flat-spots worse under load and loses even more pressure in the cold, so full pressure protects the tire shape.
How do I keep mice out of a stored enclosed trailer?+
Seal every gap with steel wool, close vents and doors tightly, and set traps or repellent inside. Mice chew wiring and nest in insulation, so blocking them out prevents costly spring repairs.
Do I really need moisture absorbers inside?+
Yes, especially in an enclosed trailer. Temperature swings cause condensation on the walls and roof with nowhere to escape. Desiccant tubs or absorbers stop that moisture from rusting hardware and rotting the floor.
How do I wake the trailer up in spring?+
Air the tires to spec, check the bearings for play and grease, reinstall the charged brake battery, test all the lights, and take a short shakedown drive before hauling any real load.
Ready to roll?
200+ trailers in stock in Douglas, GA. Financing for all credit types.
