Can LEGOs Melt in the Sun? (When Do They Melt?)

Last updated on September 14th, 2022 at 11:08 pm

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Last updated on September 14th, 2022 at 11:08 pm

Do you like LEGOs? 

For many years both kids and adults alike have enjoyed playing and building with them as they are quite simply fantastic. 

People love to buy the special sets and build them but we all probably started out just playing with random bricks and building whatever we wanted to. Because Legos are a popular toy there will often be hundreds (or thousands) of little pieces laying around which means some will end up left outside in the sun. 

Will that hurt them? Will the sun be able to actually melt the seemingly indestructible Legos? 

Legos melt at 221 degrees so the sun will not actually melt Legos. However, Legos can begin to warp at temperatures of 131 degrees which the concrete/asphalt can reach if you live in a hotter area of the country/world. 

If you have some Legos sitting outside on the grass they are extremely unlikely to even begin to warp (unless you live in a place like Phoenix Arizona that sees 120 degrees) however it is best to simply keep your Legos inside on the hottest days so there is no possibility of them being damaged. 

Although the sunlight increases the temperature of anything or any place and could in theory cause a Lego to lose its original shape, the sun will not cause a Lego to actually melt down even in the hottest places. 

If you put your Legos out on the asphalt on the hottest day of the year you might come back to a slightly changed shape of the brick but you won’t come back and find a colorful Lego puddle! 

LEGO Material & Their Ability to Melt

How hot something has to be before it starts melting depends on the material. The latest Legos are made up of two materials with the most common material used for their construction being Polycarbonate Plastic and Acrylonitrile Butadiene Styrene. 

Mostly, the manufacturer uses Acrylonitrile Butadiene Styrene for making high-quality Legos because they are very easy to color that way. 

The melting point of Legos made of these materials is 105 C or 221 F.

Another significant point is the change of melting points of these materials over time. So, due to this ability, the melting point of Legos also changes. Time also plays a significant role in its ability to melt. 

As time passes, the melting points of these materials increases so you don’t have to worry about your old Legos melting as much when compared to the new ones. 

Sunlight and Legos

The sunlight plays a significant role in reducing a Lego’s life through fading or discoloration however, it is unlikely to cause them to melt. 

If they are in direct sunlight, then it’s possible that they will change their colors through fading or even become malleable and warp where they won’t fit on other bricks as they should but the sun won’t turn them into a liquefied mess. 

They will likely lose some of their beauty and attractive coloration so high temperatures are not beneficial for them but they still won’t melt. 

It’s difficult for Legos to keep their shape and color within a hot environment so if you place them in a location where they are facing direct sunlight then they will soon become warped or faded making them virtually wordless. 

That’s why, during the summer season, the storage of Legos becomes more difficult, and people might begin to worry about them melting.

Indirect heat on your Legos 

Secondly, if Legos are not getting direct sunlight, but a lot of heat is reaching them indirectly, it is also dangerous. If you place them in a container or something else, then you will think that you might save them from direct sunlight, but that isn’t exactly the case. 

If you store your Legos in an attic or even storage unit with no temperature controls it could still damage your Legos even if no sunlight is present. 

It’s also not a good idea to leave them inside of your car for very long (unless it’s in the trunk) as the temperature inside a car on even slightly hot days could be enough to cause Legos to warp (although not melt). 

If your car is sitting in the sunlight, then the temperature inside of the vehicle will increase and could become too high for your Legos to handle without causing some issues. 

If it’s over 80 degrees outside and you have to leave your Legos in your car for more than an hour then you will want to put them in the trunk. This will help protect them from the sunlight and thereby the truck won’t get as hot, lowering the chances of the Legos warping as well. 

It can certainly be difficult to find a good place to keep your Legos so as to prevent them from being discolored or disfigured but the most important thing to keep in mind when trying to do this is avoid the sun if at all possible which will allow you to keep the temperature of the Legos lower as well. 

Sunlight has the potential to increase the temperature of any place whether it’s your attic, car, storage, etc. and if you aren’t careful it can easily damage your Legos. 

Due to this reason, the best way to save them and keep them as beautiful as they are now is to keep them away from any type of sunlight, direct or indirect, because the continuous exposure of the light of the sun can increase the temperature of anything. 

Use The Sunlight To Get Some Unique Shapes Or Colors On Your Legos

Sometimes, people will purposely use sunlight as a source of getting a new color of their Legos that simply didn’t exist before. They will intentionally  place their Legos in the direct sunlight for a long time and then wait for the sunlight to do its job. 

The heat from the direct sunlight will increase the Lego’s  temperature, and they start changing their color. When they get to the required shades, the opener will then pick them up out of the sunlight and use them for their desired purpose.

In art and crafts, for example, this is very popular as it will allow you to create unique things with these unique colors of Legos. 

Sometimes the artists, for the sake of creating something new, will melt Legos on purpose in a stove or fire then once they melt, artists will  create new beautiful things from them. 

Artists will also sometimes use the melted Lego shapes for creating fantastic crafts or attractive pieces of art. 

So, both sunlight and Legos can play an essential role in the field of arts. 


Legos are famous among people of all ages. Kids, as well as adults, have enjoyed playing with them for decades and that is unlikely to end anytime soon. 

However, since they are made of plastic they can be discolored or even warped by the sun if left outside, in cars, or stored in the wrong places. 

To avoid that happening just remember to always store and use your Legos where you would be comfortable  and you won’t have to worry about them getting damaged by the sun. 

Last updated on September 14th, 2022 at 11:08 pm

Matthew R

Hi, My name is Matt and I am all about toys! When trying to find accurate information online about toys I was finding it difficult so I decided to make this site.

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