A mattress that goes into storage correctly comes out sleeping exactly the way it went in. A mattress that goes in wrong comes out with a permanent dip down the middle, a musty smell that never fully leaves, or a warranty that the manufacturer will not honour. The difference comes down to four things: how you wrap it, which way up it sits, what it sits on, and how warm the space gets.
That last one matters more in Los Angeles than almost anywhere. Most homes here have no basement, so the mattress goes in the garage, and an uninsulated LA garage regularly runs 95 to 110 degrees in summer. Heat is what breaks down foam adhesives. Plan around it.
Step 1: Clean it and let it dry completely
Anything you seal inside plastic stays sealed in for months. Strip the bedding, vacuum the whole surface including the sides and the seam piping, then spot clean any marks with a small amount of mild detergent on a cloth rather than soaking the fabric.
Then leave it to air out for at least a full day before you wrap it. Residual moisture inside a sealed bag is the single most common cause of mildew in stored mattresses. If you have just cleaned a stain, give it two days.
Step 2: Wrap it in breathable plastic, not an airtight seal
Use a proper mattress storage bag rather than bin liners taped together. The seams on a real bag are built to survive being dragged, and the material is thick enough not to tear on a door frame.
Do not vacuum-seal or shrink-wrap it tight. Compressing a mattress that was not factory-compressed can damage foam layers and crush coil tops. Seal the bag against dust and insects, then pierce two or three small ventilation holes on the underside so any trapped humidity can escape. If the space is genuinely damp, drop a couple of desiccant packs inside the bag.
If you also want protection once it comes back out, a washable mattress protector underneath the storage bag is worth the few extra minutes.
Step 3: Move it flat, and keep it flat
This is the rule people break most often. Mattresses are engineered to be loaded from above, across their whole surface. Stand one on its side for a weekend and nothing happens. Stand it on its side for four months and gravity pulls the comfort layers toward the bottom edge, coils settle unevenly, and you get a soft strip along one side that never recovers.
Transport it on its side if you must to get it through a doorway or into a van, but lay it flat the moment it reaches the storage space. Our guide to moving a mattress without damaging it covers the carrying technique in detail.
Step 4: Get it off the floor
Concrete wicks moisture upward, even in a dry climate, and a garage floor collects dust, oil and the occasional insect. Put the mattress on a wooden pallet, a sheet of plywood on blocks, or a pair of sawhorses with a board across them. Four to six inches of clearance is plenty.
Make sure whatever it rests on is flat and continuous. A mattress bridging two narrow supports with a gap in the middle will sag into that gap over time, which defeats the purpose.
Step 5: Do not stack anything on top
Nothing. Not boxes, not a bed frame, not another mattress. Any concentrated weight left in place for weeks will leave a compression mark, and on foam that mark can be permanent. If storage space is tight, build a shelf over the mattress rather than using the mattress as a shelf.
Step 6: Control the climate if you can
The ideal storage range is roughly 50 to 80 degrees with moderate humidity. Climate-controlled storage units cost more per month, but if you are storing a mattress worth more than about a thousand dollars for longer than a season, the maths favours the unit over replacing a ruined bed.
If a garage is your only option, store the mattress along an interior wall rather than against the garage door, keep it out of direct sun through any window, and crack the door for airflow on cool mornings if the space allows.
Storing different mattress types
Memory foam and all-foam
The most heat-sensitive category. Foam adhesives soften above roughly 90 degrees, and layers can delaminate or take a set. Keep foam beds flat and cool, and avoid the garage entirely for anything longer than a few weeks in summer.
Hybrid and innerspring
More tolerant of temperature, less tolerant of being stood on edge, because the coil unit distorts. Flat storage is non-negotiable. Moisture is the main enemy here, since coils can rust in a damp space.
Latex
Latex is durable but degrades under UV light. Keep it fully covered and out of any direct sunlight. It is also heavy, so plan on two people and a solid platform underneath.
Mattress toppers
Toppers are the one item you can roll rather than store flat. Roll loosely, never fold, secure with two or three straps that are snug rather than tight, and store inside a breathable bag. A tight fold will crease foam permanently. Browse our mattress toppers if yours has already taken a crease.
Bringing it back out
Unwrap it the day it comes out, not a week later. Let it air in a ventilated room for 24 to 48 hours before you sleep on it so any storage smell dissipates. If a foam bed feels firmer than you remember, that is normal in cool conditions and it will soften back to its usual feel within a day or two at room temperature.
If it comes out with a visible dip, a lasting smell, or it just does not feel the way it used to, storage may have finished off a mattress that was already near the end. Our list of the signs you need a new mattress is a quick way to tell.
Frequently asked questions
How do you store a mattress long term?
Clean it, dry it fully, seal it in a breathable mattress storage bag with a few ventilation holes, lay it flat on a pallet or plywood raised off the floor, put nothing on top of it, and keep it in a space that stays between roughly 50 and 80 degrees. For anything beyond three months, climate control is the single biggest factor in whether it survives intact.
Can you store a mattress on its side?
Only briefly. A few days on edge during a move is fine. Weeks or months on edge lets the internal layers shift toward the lower edge, which produces uneven support and a soft side that does not bounce back. Flat is always the right answer for storage.
How do you store a mattress in a storage unit?
Choose a climate-controlled unit if the budget allows, since standard units in Southern California can exceed 100 degrees. Bring your own pallet or plywood rather than trusting the floor, position the mattress flat and away from the roll-up door, and leave an air gap around it instead of packing boxes tight against all four sides.
How do you store a mattress in a garage?
Treat a garage as short-term storage only, especially for foam. Keep the mattress flat, raised on a pallet, sealed against dust and pests, positioned along an interior wall, and out of direct sunlight. Check it monthly for any sign of moisture or pests, and move it indoors before a heat wave if you can.
How do you store a memory foam mattress?
Exactly as above, with extra attention to temperature. Memory foam is the most heat-sensitive mattress type, so a cool interior space beats a garage every time. Never compress or roll a foam mattress yourself: factory compression uses equipment designed for it, and doing it at home risks tearing the layers apart.
Does storing a mattress void the warranty?
Storage itself does not, but the damage it causes often will. Most manufacturer warranties exclude damage from moisture, staining, improper support and misuse, and a sag caused by months on edge falls under improper support. Keep your proof of purchase, and photograph the mattress before it goes into storage so you have a record of its condition.
Need a bed on the other side of the move?
If the mattress you are storing is already past its best, it may be cheaper to replace it than to pay for a climate-controlled unit to preserve it. We have five showrooms across Los Angeles, same-day delivery across most of the metro, and a free 120-night comfort guarantee so you can be sure before you commit. Take our sleep quiz for a shortlist, or check delivery options if you need timing to line up with a move.
