How to Prepare Your Storage Unit for Winter
Sep 10, 2026 / Alina Bradford
Before winter arrives, inspect your storage unit, check your belongings for moisture or damage, improve organization, remove items that can get damaged by freezing temperatures, and make sure everything is packed and stored according to the facility’s rules.
A little preparation can also make winter trips to your storage unit easier. If you know you’ll need certain items during the colder months, move them toward the front of the unit before temperatures drop.
Key takeaways
- Inspect your storage unit for signs of moisture, leaks, pests, or damage before winter.
- Remove items that may get damaged by freezing temperatures if your unit isn’t climate-controlled.
- Make sure everything going into storage is clean and completely dry.
- Use sturdy containers and protective covers for belongings that need extra protection.
- Keep belongings off the floor when possible and when permitted.
- Leave space around stored items for easier access and airflow.
- Move winter items you’ll need soon toward the front of the unit.
- Consider climate-controlled storage for belongings that can be affected by temperature or humidity changes.
- Check your facility’s rules before adding shelving, pallets, heaters, or other equipment.
Why should you prepare your storage unit for winter?
Winter can bring cold temperatures, moisture, snow, ice, and temperature changes, depending on where you live. Preparing your unit before winter gives you an opportunity to catch problems before they affect your belongings.
It’s also a good time to reorganize. If you’re storing seasonal decorations, clothing, outdoor equipment, or business inventory, put the things you’ll need during winter where you can reach them easily.
How do you prepare a storage unit for winter?
Start by giving the entire unit a quick inspection. Look at the floor, walls, ceiling, door, and stored belongings for anything that could become a problem during the winter.
- Check for moisture or leaks. Look for damp areas, water stains, or other signs of moisture.
- Clean the unit. Remove dirt, dust, and debris before putting belongings back.
- Inspect your belongings. Make sure everything is clean and dry.
- Review your packing. Replace damaged boxes or containers.
- Protect vulnerable items. Use covers or containers that make sense for the items you’re storing.
- Elevate belongings when possible. Use shelving or pallets if permitted and stable.
- Create a clear path. Keep frequently accessed items easy to reach.
- Check the door and lock. Make sure the unit closes securely.
- Review facility rules. Make sure your storage setup complies with the rental agreement.
What should you not store in a storage unit in the winter?
If your storage unit isn’t climate-controlled or an indoor unit, the contents may be exposed to freezing temperatures during the winter. So, there are a few things that you shouldn’t store in your unit during the winter.
- Makeup: Certain ingredients in makeup products can go bad or separate in freezing temperatures.
- Paint: No matter if it’s house paint or paint for your art projects, they need to be stored at room temperature to keep its consistency.
- Cleaning products: Some liquid cleaners can freeze, separate, or become less effective. Check the product label and facility rules before storing any cleaning products.
- Medications: Freezing temperatures can affect the stability and effectiveness of some medications. They generally should be stored according to the manufacturer’s temperature requirements.
- Certain electronics: Extreme temperature changes can cause condensation when electronics are moved from a cold environment into a warm one.
- Musical instruments: Wood instruments can be particularly sensitive to temperature and humidity changes, which can cause cracking, warping, or other damage.
- Leather goods: Very cold or fluctuating conditions can contribute to drying, cracking, or changes in the material.
- Liquids: Water-based liquids can expand when frozen, potentially damaging their containers.
- Batteries: Some batteries can be damaged by extreme cold or lose performance when exposed to low temperatures.
- Plants: Plants generally shouldn’t be stored in a storage unit, regardless of temperature, and Public Storage prohibits plants.
- Wine and other beverages: Freezing can cause liquids to expand and potentially damage bottles or containers. These may also be prohibited by the facility.
Also, don’t forget that, no matter the season, Public Storage prohibits items such as perishables, plants and animals, illegal items, and certain hazardous materials. Liquids and toxic chemicals, including bleach, are also prohibited under its storage rules.
How do you protect belongings from winter moisture?
Moisture can be a bigger concern than cold temperatures for some stored belongings.
To reduce moisture-related problems:
- Make sure belongings are completely dry before storing them.
- Use clean, dry containers.
- Avoid sealing damp items inside plastic.
- Keep belongings off the floor when possible and when permitted.
- Don’t pack boxes so tightly that air can’t circulate around them.
- Leave some space between stored items and walls when your storage setup allows.
- Check moisture-sensitive belongings periodically.
Climate-controlled storage may provide additional protection for items that are sensitive to temperature or humidity changes, but it doesn’t replace proper preparation and packing.
Should you use climate-controlled storage in winter?
Climate-controlled storage may be worth considering for belongings sensitive to temperature or humidity changes.
This may include:
- Makeup
- Art supplies
- Clothing and textiles
- Leather
- Wood furniture
- Electronics
- Books and paper records
- Artwork
- Musical instruments
- Certain specialty merchandise
Standard storage may work well for durable items that aren’t particularly sensitive to environmental changes.
What should you move to the front of your storage unit for winter?
Think about what you’ll realistically need between fall and spring. For example, you may want to move these items closer to the entrance:
- Winter clothing
- Holiday decorations
- Snow and winter equipment
- Cold-weather business supplies
- Seasonal inventory
- Holiday retail displays
- Winter sports equipment
- Items you plan to donate or sell
How often should you check your storage unit in winter?
There’s no single schedule that works for every storage unit, but periodic checks can help you catch problems early. Consider checking on your unit after particularly severe weather and whenever you’re already visiting to retrieve something.
Look for:
- Moisture
- Water stains
- Damaged boxes
- Signs of pests
- Shifting or unstable stacks
- Damaged furniture covers
- Problems with the unit door or lock
If you notice a maintenance issue with the storage facility, report it to the facility rather than attempting repairs yourself.
Winter storage preparation checklist
Before winter, run through this quick checklist:
| Task | Done |
| Inspect the unit for moisture or damage
Remove any items that may be damaged by cold |
☐ |
| Sweep and clean the unit | ☐ |
| Check belongings for moisture | ☐ |
| Replace damaged boxes or containers | ☐ |
| Protect furniture and other vulnerable items | ☐ |
| Elevate belongings when possible and permitted | ☐ |
| Move winter items toward the front | ☐ |
| Leave clear pathways | ☐ |
| Check your lock and unit door | ☐ |
| Review your facility’s storage rules | ☐ |
| Check whether climate-controlled storage would benefit sensitive belongings | ☐ |
| Update your inventory list | ☐ |
FAQs
Can I use a dehumidifier in a storage unit?
Don’t assume you can plug in or operate a dehumidifier inside a storage unit. Check the facility’s rules and rental agreement first. If moisture is a concern, ask the facility about available storage options, including climate-controlled units.
Should you clean your storage unit before winter?
Yes. Cleaning the unit before winter is a simple way to start the season with a clean storage space. Sweep the floor and remove trash, dust, and debris. Pay particular attention to corners and areas underneath or behind stored items.
You should also clean belongings before putting them into storage. Dirt, food residue, and moisture can create problems while items are stored.
Will cold weather damage my belongings in storage?
It depends on the materials. Some belongings tolerate cold temperatures well, while others can be affected by temperature changes. Check manufacturer storage recommendations for valuable or temperature-sensitive items.
How do I keep cardboard boxes from getting damp in storage?
Start with completely dry belongings and dry boxes, and keep boxes elevated when possible and permitted. Don’t place cardboard directly against visibly damp surfaces.
Should I cover everything in my storage unit?
Not necessarily. Covers can help protect furniture and other belongings from dust, but the covering should make sense for the material and storage conditions. Avoid trapping moisture against an item.
What should I do with my storage unit after a winter storm?
If severe weather has affected your area, check the unit when it’s safe to travel. Look for signs of water intrusion, damaged packaging, or other problems, and contact the facility if you notice a building or unit issue.
