Prepare your mattress before moving it into storage

The first step is to clean your mattress thoroughly and let it dry completely. Vacuum both sides with an upholstery attachment to remove dust, dead skin cells, and debris that can attract pests and mold. If there are stains, spot-clean them with a mild soap solution and allow the mattress to air-dry for at least 24 hours in sunlight if possible—sunlight naturally kills bacteria and helps dry moisture.

Once the mattress is clean and dry, inspect it for any existing damage, small tears, or weak seams. Take photos of the mattress condition before storage; this protects you if damage occurs while the mattress is stored and you need to file a claim with your insurance. Check that the mattress is completely dry before wrapping—moisture trapped inside leads to mold and mildew growth that can ruin the mattress permanently.

Key Takeaways

  • Clean and completely dry your mattress before wrapping it, and take photos of its condition for your records.
  • Wrap the mattress in a plastic mattress bag or heavy plastic sheeting, sealed with tape, to block moisture and dust.
  • Store the mattress flat on a pallet or wooden platform, never on the floor, and keep it away from windows, pipes, and exterior walls.
  • Maintain the storage unit temperature between 50 and 85 degrees Fahrenheit and keep humidity below 50 percent to prevent mold and material breakdown.
  • Do not stack heavy items on top of the mattress, as compression damages the internal structure and voids most warranties.

Wrap the mattress in protective plastic

Use a plastic mattress bag designed for storage, which you can buy at moving supply stores, big-box retailers, or online. These bags are thicker than regular plastic sheeting and have handles for easier transport. If you cannot find a mattress bag, heavy plastic sheeting (at least 4 mil thickness) works as a substitute—wrap it around the mattress and seal all seams and edges with strong packing tape.

The plastic layer blocks dust, moisture, and pests from reaching the mattress surface. Seal every opening tightly; even small gaps allow humidity and insects to enter. Do not use thin plastic grocery bags or regular plastic wrap—they tear easily and offer no real protection. If the mattress will be stored longer than a few months, consider adding a layer of breathable fabric (like an old sheet) between the mattress and plastic to allow any trapped moisture to escape without condensing.

Position the mattress on a raised platform

Never place the mattress directly on the storage unit floor. Concrete floors absorb and hold moisture, which seeps into the mattress from below and creates conditions for mold growth. Instead, place the mattress on a wooden pallet, wooden platform, or bed frame that lifts it at least 4 to 6 inches off the ground. This gap allows air to circulate underneath and prevents moisture from pooling.

If you do not have a pallet, stack concrete blocks or wooden boards to create a raised base. Make sure the platform is level and stable so the mattress does not shift or sag during storage. Avoid storing the mattress on its side or at an angle—store it flat. Storing a mattress upright or at an angle compresses the internal springs or foam unevenly and can permanently deform the structure.

Control temperature and humidity in the storage unit

Mattresses are vulnerable to temperature swings and high humidity. The ideal storage environment keeps the temperature between 50 and 85 degrees Fahrenheit and humidity below 50 percent. Extreme heat breaks down foam and fabric, while cold makes materials brittle. High humidity promotes mold, mildew, and dust mite colonies.

If your storage unit is not climate-controlled, monitor conditions with an inexpensive thermometer and humidity meter (available at hardware stores). If humidity regularly climbs above 50 percent, place desiccant packets or a small dehumidifier in the unit to absorb excess moisture. In very humid climates, a climate-controlled storage unit costs more but protects your mattress far better than an uncontrolled space, especially for long-term storage.

Keep the mattress away from problem areas in the unit

Position the mattress away from exterior walls, windows, and doors. These areas experience temperature fluctuations and allow outside moisture to seep in. Avoid storing the mattress near water pipes, HVAC vents, or any plumbing—a leak can destroy the mattress in hours. If the storage unit has a roof, keep the mattress away from the ceiling as well, since roof leaks often go unnoticed until damage is severe.

Leave at least 12 inches of clearance on all sides of the mattress so air can circulate around it. Do not stack boxes, furniture, or other items on top of the mattress. The weight compresses the internal structure and voids the manufacturer's warranty in most cases. If you need to store other items, place them beside the mattress or use shelving to keep weight off the top surface.

Check on the mattress periodically

Even in ideal conditions, visit the storage unit every few months to inspect the mattress. Look for signs of moisture, discoloration, odors, or pest damage. If you notice condensation on the plastic wrap, open the unit door to allow air circulation and consider adding a dehumidifier. If the plastic has torn or separated, rewrap the mattress when ready to prevent further exposure.

Rotate or flip the mattress every three to four months if you are storing it for more than six months. This prevents uneven settling and helps maintain the internal structure. If the mattress begins to smell musty or shows visible mold growth, the damage is likely permanent and the mattress should be discarded—mold cannot be fully removed and poses health risks.

Understand what damages mattresses in storage

The most common causes of mattress damage in storage are moisture, pests, and compression. Moisture creates mold and mildew that spread through the foam or fabric and cannot be cleaned out. Rodents and insects nest inside mattresses and leave droppings and debris. Heavy weight on top compresses the springs or foam permanently, creating lumps and sagging that make the mattress unusable.

Temperature swings cause materials to expand and contract, weakening seams and breaking down adhesives that hold foam layers together. Sunlight and heat break down fabric dyes and degrade foam. Storing a mattress in an uncontrolled, unmonitored space for years almost guarantees some form of damage. If you plan to store a mattress long-term, a climate-controlled unit is the only way to preserve it reliably.

Frequently Asked Questions

Can I store a mattress standing up or on its side?

No. Storing a mattress upright or at an angle compresses the internal springs or foam unevenly and causes permanent sagging and lumps. Always store the mattress flat on a raised platform. If space is extremely tight, a thin foam mattress can sometimes be stored on edge for short periods, but this is not recommended for innerspring or memory foam mattresses.

How long can a mattress stay in storage?

A mattress can be stored indefinitely if conditions are controlled—temperature between 50 and 85 degrees, humidity below 50 percent, and no weight on top. In an uncontrolled unit, damage typically begins within three to six months. The longer the storage period, the greater the risk of mold, pest infestation, or material breakdown, especially in humid climates.

Do I need a climate-controlled storage unit?

Climate control is not required for short-term storage (a few weeks to a couple of months) if the mattress is properly wrapped and elevated. For storage longer than three months, or in humid climates, climate control significantly reduces the risk of mold and material damage. Standard units are cheaper but offer no protection against temperature swings or moisture.

What should I do if I find mold on the mattress?

If mold is visible on the plastic wrap but not on the mattress itself, wipe the plastic clean and improve ventilation in the unit. If mold has grown on the mattress fabric or foam, the mattress is not safe to use and should be discarded. Mold cannot be fully removed and poses respiratory health risks, especially for people with allergies or asthma.

Can I store a used mattress that smells?

If the mattress smells musty or stale, clean and air it out in sunlight for at least 24 hours before wrapping and storing. If the smell persists after cleaning, it may indicate mold or mildew already present in the mattress. Do not store a mattress with an odor you cannot identify—the problem will worsen in storage and the mattress may become unusable.