Storing a Mattress Safely to Prevent Mold and Sagging

For recommendations, see our best mattress toppers guide. To store a mattress, clean and fully dry it first, seal it in a mattress storage bag, keep it flat in a cool, dry, climate-controlled space, and never crush it under heavy items. Storing a mattress the wrong way can leave it musty, misshapen, or ruined by the time you need it again, so a few simple rules protect it. For a move or short-term storage, vacuum-sealing and rolling a foam mattress can save remarkable time and space. Done right, a mattress comes out of storage as good as it went in. The approach depends a little on the mattress type, which our guide on how to choose a mattress covers. This guide walks through preparing, sealing, storing, and how long you can keep one.

Quick Verdict

To store a mattress, clean it and let it dry completely, seal it in a mattress storage bag, and keep it flat in a cool, dry, climate-controlled space away from moisture, with nothing heavy stacked on top. For moving or short-term storage, vacuum-sealing and rolling a foam mattress saves significant space and effort. Avoid damp areas, folding innerspring mattresses long term, and crushing it under weight.

Why Trust This Guide

Independent guidance, reader-supported through affiliate links at no cost to you. This guide includes firsthand experience storing a mattress for a move, alongside the mattress-care and sleep sources cited in Sources.

Key Takeaways

Clean the mattress and let it dry fully before storing to prevent mold and odors.
Seal it in a mattress storage bag to keep out dust, moisture, and pests.
Store it flat when possible to protect its internal structure.
Keep it in a cool, dry, climate-controlled space, not a damp garage or basement.
Vacuum-sealing and rolling a foam mattress saves space for moves and short-term storage.

How We Researched This

This guide combines firsthand experience storing a mattress during a move with general mattress-care guidance from the Sleep Foundation on keeping a sleep surface clean, dry, and structurally sound.¹ Because a mattress’s support depends on its internal structure staying intact, storage methods that protect that structure matter for how it performs afterward.²

How to Store a Mattress Step by Step

Follow these steps in order.

Clean the surface and let the mattress dry completely.
Seal it in a mattress storage bag to keep out dust, moisture, and pests.
Store it flat to protect its internal structure; an all-foam mattress can be vacuum-sealed and rolled for a move.
Place it in a cool, dry, climate-controlled space, raised off any damp floor.
Keep heavy items off the top so it does not compress or deform.

Clean and Dry It First

Whatever comes next, preparation starts the same way, and skipping it is how mattresses come out of storage smelling musty.

Clean the Surface

Strip the bedding and clean the mattress surface, vacuuming it and spot-treating any marks, so you are not sealing dirt and body oils in for the duration. Our mattress-cleaning guide and mattress cleaners guide help here. A clean mattress stores far better and comes out fresher, with much less risk of trapped odors or stains setting in over a long storage period.

Let It Dry Completely

Make sure the mattress is fully dry before sealing it, since any trapped moisture can lead to mold and mildew in storage. If you cleaned it with anything damp, give it ample time to air out completely first. This step is non-negotiable for long storage.

Use a Mattress Storage Bag

A proper cover is what keeps a stored mattress protected and clean.

Seal Out Dust and Moisture

Slide the mattress into a mattress storage bag and seal it to keep out dust, dirt, moisture, and pests. A sturdy, sealed cover is the main defense during storage, and it keeps the mattress ready to use the moment you unpack it. Pairing it with a mattress protector adds another clean layer.

Choose the Right Bag

Use a bag sized for your mattress and made of durable material, ideally one that resists tearing during the move into and out of storage. A flimsy bag that rips defeats the purpose, so a heavier-duty cover is worth it for longer storage.

Store It Flat When You Can

How you position a mattress in storage affects its structure.

Flat Protects the Structure

Storing a mattress flat, the way you sleep on it, best preserves its internal structure and even support, especially for innerspring and hybrid mattresses with coils. Standing it on its side for a long time can let materials shift or settle unevenly.

If Space Forces an Upright Position

If you must store a mattress on its side short term, support it so it does not bow or lean under its own weight, and return it to flat as soon as you can. For long-term storage, flat is the safer choice for keeping it in shape.

Vacuum-Sealing and Rolling a Foam Mattress

For a move or short-term storage, this method is a genuine space-saver, and it is the approach I reached for myself.

My Experience

When I moved a while back, I was able to vacuum-seal my old mattress and roll it up, and it saved so much time and space on the move. It was genuinely really helpful.

How and When It Works

Vacuum-sealing and rolling works best for all-foam mattresses, which compress and recover well, and it is ideal for moving or short-term storage rather than years on end. Innerspring and hybrid mattresses with coils should not be compressed and rolled this way, since it can damage the springs. For a foam mattress and a move, though, sealing and rolling it is hard to beat.

Keep It in the Right Conditions

Where you store the mattress matters as much as how you wrap it.

Cool, Dry, and Climate-Controlled

The Sleep Foundation advises storing a mattress in a cool, dry, climate-controlled space rather than a damp garage, basement, or shed, where humidity invites mold and temperature swings can degrade materials. A stable, dry environment keeps the mattress in good condition for the long haul, protecting both its materials and its support.

Avoid Damp and Direct Ground Contact

Keep the mattress off a damp floor, ideally raised on a pallet or flat surface, so moisture from the ground cannot seep in. Good airflow around it and a dry setting prevent the musty smell and mildew that ruin poorly stored mattresses, which are difficult to remove once they set in.

Do Not Stack or Crush It

Weight is the enemy of a stored mattress’s shape.

Keep the Top Clear

Do not pile heavy boxes or items on top of a stored mattress, since the prolonged weight can compress and permanently deform it, especially foam layers. Keep the surface clear so the mattress holds its shape until you need it again.

How Long Can You Store a Mattress?

Storage time affects your approach.

Short Term Versus Long Term

For short-term storage or a move, vacuum-sealing and rolling a foam mattress is efficient and convenient. For longer storage, keeping the mattress flat, sealed, and in a climate-controlled space best preserves it. The longer the storage, the more those conditions, dry, cool, flat, and protected, matter for the mattress staying usable.

Storing Different Mattress Types

The mattress type shapes the safest way to store it.

Foam Mattresses

All-foam mattresses compress and recover well, so they tolerate vacuum-sealing and rolling for a move or short-term storage. For longer storage, laying a foam mattress flat in a sealed bag in a dry, climate-controlled space keeps it in the best shape.

Innerspring and Hybrid Mattresses

Mattresses with coils should not be compressed, rolled, or folded, since that can damage the springs and ruin their support. Store them flat in a storage bag, and if space forces them upright briefly, support them so they do not bow, returning them to flat as soon as possible. See our hybrid mattress guide for how their construction works.

Bringing a Mattress Out of Storage

How you unpack a stored mattress affects how it performs when you sleep on it again.

Let It Air and Recover

Unseal the mattress and let it air out in a well-ventilated room, which clears any storage odors and lets the materials breathe. A foam mattress that was vacuum-sealed and rolled needs time to decompress and expand back to its full shape before use, so give it the recovery time the manufacturer suggests.

Check Before You Sleep On It

Inspect the mattress for any moisture, musty smell, or signs of pests before putting it back into service. If it was stored clean, dry, and sealed, it should come out fresh and ready, regaining its loft and support once it has fully aired and, for foam, expanded.

Common Mattress-Storage Mistakes to Avoid

A few errors are what leave mattresses ruined in storage.

Storing It Damp

Sealing a mattress that is not fully dry traps moisture and invites mold and mildew. Always clean it and let it dry completely before bagging it, no matter how eager you are to get it put away.

Keeping It in a Humid Space

A damp garage, basement, or shed exposes a mattress to humidity and temperature swings that degrade it. Choose a cool, dry, climate-controlled spot instead, and keep the mattress off any damp floor.

Crushing or Folding the Wrong Type

Stacking heavy items on a mattress or folding and compressing an innerspring or hybrid for long periods can permanently damage it. Keep the top clear, store flat when possible, and reserve vacuum-sealing and rolling for foam mattresses on a short-term basis.

Recommended Reading

Storing a Mattress FAQ

How do I store a mattress properly?

Clean it and let it dry completely, seal it in a mattress storage bag, and keep it flat in a cool, dry, climate-controlled space with nothing heavy on top. For a move or short-term storage, vacuum-sealing and rolling a foam mattress saves space. Avoid damp areas and crushing it under weight.

Can I store a mattress on its side?

Short term, yes, if you support it so it does not bow or lean, but for long-term storage, flat is better. Storing flat preserves the internal structure and even support, especially for innerspring and hybrid mattresses, so return it to flat as soon as space allows.

Can you vacuum-seal and roll a mattress?

Yes, for all-foam mattresses, which compress and recover well, making vacuum-sealing and rolling a great space-saver for moving or short-term storage. In my own experience it saved real time and space during a move. Innerspring and hybrid mattresses with coils should not be rolled this way.

How do I keep a stored mattress from getting moldy?

Make sure it is completely dry before sealing it, store it in a cool, dry, climate-controlled space rather than a damp garage or basement, and keep it off any damp floor. A sealed storage bag and good airflow around it prevent the moisture that causes mold and a musty smell.

Where is the best place to store a mattress?

A cool, dry, climate-controlled indoor space is best, since it avoids the humidity and temperature swings of garages, basements, and sheds. Keep the mattress flat, sealed in a storage bag, off any damp floor, and clear of heavy items stacked on top.

Can I store a mattress in the garage?

It is not ideal, because garages often have humidity, temperature swings, and pests that can damage a mattress. If you have no other option, seal it well in a storage bag, raise it off the floor, and accept that a climate-controlled space would protect it far better.

How long can a mattress be stored?

For short periods or a move, vacuum-sealing and rolling a foam mattress is convenient. For longer storage, keeping it flat, sealed, and climate-controlled best preserves it. The longer the storage, the more those conditions matter, so prioritize a dry, cool, flat, protected setup for extended periods. For lifespan expectations see how long mattresses last, and a well-kept spare is handy for outfitting a guest room.

Do I need a special bag to store a mattress?

A mattress storage bag is strongly recommended, since it seals out dust, moisture, and pests and keeps the mattress clean and ready to use. Choose a durable, correctly sized bag that resists tearing during the move into and out of storage for the best protection.

Will a vacuum-sealed foam mattress expand back to normal?

A quality all-foam mattress is designed to be compressed and should expand back to its full shape after being unsealed, given time to decompress in a ventilated room. Allow the recovery time the manufacturer suggests before sleeping on it, since it needs to regain its full loft and support.

How do I get a musty smell out of a stored mattress?

Air the mattress out in a well-ventilated room so the materials can breathe and release trapped odors. Storing it clean, dry, and sealed in the first place prevents most mustiness, so a smell usually points to moisture during storage. If it persists, more thorough cleaning and drying may be needed.

Can I store a mattress standing up against a wall?

For a short period you can, provided you support it so it does not bow, lean, or slide, but it is not ideal for long-term storage. Standing a mattress upright for a long time can let materials shift or settle unevenly, so lay it flat for extended storage whenever space allows.

Should I store a mattress flat or rolled?

For long-term storage, flat is best for any mattress type, since it preserves the internal structure and even support. Rolling is suitable mainly for all-foam mattresses during a move or short-term storage, while innerspring and hybrid mattresses should always be kept flat and never rolled or compressed.

Sources

Sleep Foundation. How to Store a Mattress and Mattress Care. https://www.sleepfoundation.org/mattress-information
Kovacs FM, et al. Effect of firmness of mattress on chronic non-specific low-back pain. The Lancet. 2003;362(9396):1599-1604. https://pubmed.ncbi.nlm.nih.gov/14630439/