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To store a mattress properly: clean it and let it dry completely, wrap it in a breathable mattress storage bag (not sealed plastic), transport it flat rather than folded, store it lying flat in a cool, dry, climate-controlled space, keep it off a concrete floor, and never stack heavy items on top. Done this way a mattress stores well for months to a couple of years. The two mistakes that ruin a stored mattress are trapping moisture with airtight plastic and storing it on its side, which lets the internals shift and sag permanently.
A mattress is a big investment to lose to a few weeks of careless storage, and the damage, mold, permanent lumps, a sag that will not recover, is often invisible until you put it back into service. The good news is that storing one well is not complicated; it just has a handful of rules that each address a specific way mattresses fail in storage. Follow them in order and the mattress comes out the way it went in.
Why careful mattress storage matters
A mattress is built from layered foams, fibers, and often coils that are engineered to hold a specific shape and support the body evenly. Storage stresses every one of those materials in ways daily use does not: prolonged pressure in one spot, moisture with nowhere to escape, and gravity pulling on internals held in an unnatural position. The failures show up later, when you unwrap a mattress that smells musty, has a permanent lump, or sags where it was compressed. Because the damage is usually invisible until the mattress is back in service, storing it correctly is entirely about prevention. The handful of rules in this guide each target a specific failure mode, and skipping any one of them is how a perfectly good mattress comes out of storage ruined. The time investment is small, an hour or two of prep, against protecting a purchase that often costs several hundred to over a thousand dollars.
Step 1: Clean it thoroughly
Anything left on the mattress, sweat, oils, dust mites, stains, will set in during storage and can attract pests, so start clean:
- Strip and vacuum the whole surface, including the sides and seams, with an upholstery attachment.
- Spot-clean stains with a mild upholstery cleaner or a mix of mild detergent and water, applied sparingly.
- Deodorize by sprinkling baking soda over the surface, letting it sit, and vacuuming it up.
- Do not soak it. Excess water is worse than a little grime; use minimal moisture and blot rather than saturate.
Step 2: Let it dry completely
This step is the difference between a good mattress and a moldy one. Any dampness sealed inside a wrapped, stored mattress becomes mold and mildew. After cleaning, let the mattress air out fully, ideally in a well-ventilated room or briefly in indirect sun and fresh air, until there is no trace of moisture. Do not rush to wrapping; give it hours, not minutes. If in doubt, wait longer. A completely dry mattress is the single most important precondition for safe storage.
Step 3: Wrap the mattress in a breathable cover
Wrapping keeps out dust, dirt, and pests, but the type of wrap matters enormously:
- Use a breathable mattress storage bag or a cover designed for the purpose, which lets the mattress ventilate.
- Avoid sealing it airtight in thick plastic, which traps humidity inside and breeds mold. If plastic is all you have, do not seal it fully; leave it able to breathe.
- Tape the cover closed loosely to keep pests out without making it airtight.
Step 4: Move it flat, not folded
Getting it to storage matters as much as the storage itself. Never fold or bend a mattress, especially an innerspring or hybrid; folding can crack the internal support and permanently damage coils and foam. (A few foam mattresses can tolerate short bending, but flat is always safest.) Carry it flat, and in the moving vehicle lay it flat if at all possible. If it must ride on its side for a short trip, keep the trip brief and lay it flat as soon as you arrive. Do not stack or lean heavy objects against it in transit.
Step 5: Choose the right storage space
| Space | Suitability | Why |
|---|---|---|
| Climate-controlled storage unit or indoor room | Best | Stable temperature and humidity prevent mold and material breakdown |
| Basement | Risky | Often damp; use a dehumidifier and keep it off the floor |
| Garage | Risky | Temperature and humidity swings; pest exposure |
| Shed or outbuilding | Poor | Uncontrolled climate and pests |
A climate-controlled environment is worth the modest extra cost for anything beyond a couple of weeks. Wherever you store it, keep it off a concrete floor on a pallet or tarp, since concrete wicks moisture upward into the mattress.
Step 6: Store it flat and unweighted
Two final rules preserve the structure:
- Lay it flat. Storing a mattress on its side for weeks or months lets the internal materials shift and settle unevenly, creating permanent lumps and sagging. Flat storage keeps the coils and foam in their intended position.
- Never stack heavy items on top. Weight compresses the comfort layers and can leave permanent impressions. Keep the top of the mattress clear; do not treat it as a shelf.
Storing the box spring and frame too
If you are storing the mattress, you are usually storing the rest of the bed with it, and the same principles apply with a few differences. A box spring or foundation can be stored on its side more safely than a mattress, since it is a rigid structure rather than layered comfort materials, though flat is still ideal and keeps the fabric from stretching. Wrap it in a breathable cover like the mattress to keep out dust and pests. Disassemble a bed frame rather than storing it whole; keep all bolts, brackets, and center-support hardware in a labeled bag taped to the frame so reassembly is not a scavenger hunt. Wooden frames and slats should be stored flat and dry, since damp storage can warp wood, and metal frames should be dry to prevent rust. Do not stack the mattress under the heavier frame components, which would compress it.
Quick mattress storage checklist
| Step | Done right |
|---|---|
| Clean | Vacuumed, spot-cleaned, deodorized |
| Dry | Completely dry, no residual moisture |
| Wrap | Breathable cover, not sealed airtight plastic |
| Transport | Carried and hauled flat, never folded |
| Environment | Cool, dry, climate-controlled; off concrete |
| Position | Stored flat, nothing heavy stacked on top |
Common mattress storage mistakes
- Sealing it in airtight plastic — traps moisture and breeds mold. Use a breathable cover.
- Storing it on its side for months — internals shift and sag permanently. Store flat.
- Wrapping it while still damp — the fastest route to mildew. Dry it fully first.
- Laying it on a concrete floor — concrete wicks moisture upward. Use a pallet or tarp.
- Stacking boxes or furniture on top — leaves permanent impressions. Keep the top clear.
- Folding an innerspring mattress — cracks the coils. Never fold.
Bringing it back into use
When storage ends, do not just throw sheets on and sleep. Unwrap the mattress and let it air out in a ventilated room for several hours to a day, which clears any faint stored-air odor and lets it breathe. Inspect it for any signs of moisture, mold, or pests before use, and vacuum the surface again. A mattress stored correctly should come back into service feeling and performing as it did before. If it shows a sag from storage, the fixes in how to fix a sagging mattress may help.
For related mattress care see how long does a mattress last and how often should you replace a mattress. A protector keeps a stored or in-use mattress cleaner; our ranked field is in best mattress protector. More at the bedding and sleep hub; our method is in how we rank.