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Leaving Your Memory Foam Mattress in the Box: How Long Can You Wait?

The amount of time that you can leave your new memory foam mattress in the box depends on the brand you buy. The normal length of time you can safely leave your mattress rolled-up and compressed varies from 1 week to 3 months. We generally recommend unpacking your mattress as soon as possible to avoid any issues.

How Long Can You Keep a Memory Foam Mattress in the Box?

Most mattress manufacturers have guidelines on their websites that let you know how long you can keep your mattress in a box before unpacking it. The general time frame ranges from 1 week – 3 months.

  • Zinus – 1 week
  • Noa – 1 week
  • Purple – 2 weeks
  • Layla – 2 weeks
  • Lull – 3 weeks
  • Tuft & Needle – 3-4 weeks
  • Bear – 3 weeks – 30 days (depending on mattress type)
  • Helix – 4 weeks
  • Nolah – 30 days
  • Leesa – 30-60 days (depending on mattress type)
  • Eve – 1 month
  • Emma – 4 weeks
  • Ecosa – 6-8 weeks
  • Comfy – 3 months
  • Casper – 3 months
  • Simba Sleep – 3 months

The exact time frame can vary depending on mattress types. Most manufacturers recommend that you remove hybrid and innerspring mattresses from the box faster than memory foam mattresses. This is because leaving your mattress in the box for too long can damage the coils. Since memory foam mattresses don’t have metal coils to worry about, they can stay rolled-up for much longer than other types.

memory foam mattress corner

Risks of Waiting Too Long to Remove Your Mattress From the Box

Your mattress may not properly expand

The main risk associate with leaving your memory foam mattress in a box for too long is that it may not expand fully once you open it.

If your mattress stays rolled-up tightly for an extended period of time, the material may get stuck and stay compressed when you eventually unpack it.

If you’ve waited too long to remove your memory foam mattress from its packaging and it isn’t expanding, there are a few things you can do to help it decompress. We recommend increasing the temperature in the room, increasing air circulation (using a fan or open window), placing it on the floor or other flat surface, and massaging the the foam layers.

Warranty issues

Leaving the rolled mattress in a box for too long could actually void the manufacturer’s warranty. Most limited warranties only apply if you follow all of the instructions and take proper care of your mattress.

Even if the mattress expands fully, if you later find a defect and the company determines that you left it in the box for too long, then your warranty claim might be invalid. This could be a huge problem, since many mattress companies offer lifetime warranties and you could be missing out on protecting your purchase.

It might be boring, but make sure you read through the warranty terms before buying a new mattress-in-a-box. It could save you a major headache down the line.

Reduced comfort

Leaving your memory foam mattress in its box for too long could degrade the quality of the foam and make it feel uncomfortable to sleep on.

Memory foam products aren’t designed to stay compressed for extended periods of time. Most memory foam mattresses are made out of several layers. The upper layers (comfort layers) are made out of lower-density memory foam compared to the base foam in the support layers.

If you keep your mattress rolled-up in the box, then the low-density comfort layers may become thinner. This will affect the firmness of your memory foam mattress (likely by making it feel firmer than expected).

It’s also important to note that leaving your memory foam mattress in the box could reduce its expected lifespan, since compression causes the comfort layers to degrade faster.

handprint on a mattress

Unpack Your Mattress as Fast as Possible

You shouldn’t be asking “how long can you leave a memory foam mattress in the box?”. The best way to look at it is “how long should you leave it in the box?”

The answer is: you should unpack it immediately once the mattress arrives.

If you want to avoid any issues that affect the comfort and durability of your memory foam mattress, you should unbox it within 3 days of delivery.

If you absolutely must leave it in the box for a longer period of time, we recommend checking the mattress company website or emailing their customer service team to find out exactly how long you can keep your new mattress rolled-up and compressed without damaging the it or voiding your warranty.

Frequently Asked Questions

How do manufacturers compress mattresses into a box?

Mattress makers use a special mechanical process to compress your mattress and place it in a box for delivery.

When the company constructs the mattress, it starts out fully expanded. Here’s the compression process that they use to make sure it takes up less space.

  1. The memory foam mattress is squished flat using a special machine.
  2. It’s then vacuum-sealed in a plastic wrapping.
  3. A machine carefully folds it in half.
  4. Another machine rolls it up.
  5. The rolled mattress is placed in a cardboard box, which is how it arrives at your doorstep after you buy online.

Can you re-box a memory foam mattress once it’s fully expanded?

Unfortunately, you won’t be able to compress your memory foam mattress down to the original size it came in when it arrived on your doorstep. Manufacturers use specialized equipment to make sure that the mattress compresses and then eventually is able to fully expand once you remove it from the box.

There are cheap mattress vacuum bags that you can buy that promise to help you compress your memory foam mattress down to 1/10 of its original size. Using a vacuum and a cheap vacuum bag, you can significantly reduce the size of your mattress, making it easier to ship if you’re moving long distances.

How long does it take a mattress to expand?

Most memory foam mattresses fully expand within a few hours. In some cases, it can take up to 3 days to expand properly.

Some manufacturers claim that you shouldn’t sleep on your memory foam mattress for 24 hours after unpacking it. In our experience, it isn’t strictly necessary to follow that guideline. But if you notice that your memory foam mattress isn’t expanding, then don’t sleep on it immediately. It may need more time to expand to its full size.

Side of a mattress


The amount of time you can leave your new memory foam mattress rolled-up in the box varies depending on the manufacturer. Some brands recommend that you remove it within a few days, while others claim you can safely wait several months.

It’s important to follow whatever guidelines that the manufacturer recommends, otherwise you could end up with a defective mattress with a voided warranty.

Leaving your new mattress in its box for too long could cause the memory foam to degrade (especially if it’s made out of gel foam). If you wait longer than the time frame that the manufacturer guidelines say you should, then you could end up with an uncomfortable mattress due to degradation in the different layers of memory foam.

Buying a mattress-in-a-box is incredibly convenient and we definitely recommend it to everyone. It’s important to be aware of the downsides of this convenience, which can mostly be avoided by using common sense and not leaving it compressed for too long.

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