Lava rocks have many uses in landscaping, gardening, grilling, and fire pits. They are often included when you purchase a propane gas fire pit, but not always.
Fire pit lava rocks vary mainly in color, size, and heat retention depending on the brand, with some offering unique hues like red or black. Quality also differs, as some brands provide more durable, high-heat-resistant rocks that last longer and resist crumbling.
These are our top picks.
Best lava rocks for fire pits
 | Red 3/4 Inch Lava Rock |
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 | Medium Lava Rocks |
| View On AmazonView On Home Depot |
 | Midwest Hearth Lava Stones |
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This section will introduce five products, including one alternative to Lava Rocks.
1. Fire Pit Essentials Lava Rocks
Fire Pit Essentials is a trusted brand that has been around since 2014.
They produce several products to improve the function of your fire pit while making it more aesthetically pleasing. Thus, it is no surprise that they manufacture their line of heat-resistant rocks for fire pits.
Customers almost universally attest to the excellent function of Fire Pit Essentials fire pit rocks.
Users report they retain heat to keep flames going while protecting the bottom of your fire pit and assisting with drainage. Ordering them gets you 10 pounds of rocks in the size of your choice.
Size options include:
- 3-5 inches
- 1-3 inches
- 3/4 of an inch
- 3/8 of an inch
Just be aware that though reviews for these indicate they are generally good propane or gas fire pit rocks, you will have to take some steps to prepare them.
Some reviews indicate that they will produce an unpleasant smoke if not rinsed, which you can avoid by rinsing them and letting them thoroughly dry.
A few customers indicated that quality diminished in larger orders of these rocks and that the fire pit rocks were even of such low quality that they exploded when heated. Though it is a slim possibility, its chances are above zero, so prepare your yard and cover your fire pit when it is not in use.
But we also have an explanation for how this may have happened, which you will see if you keep reading.
2. American Fire Resistant Lava Rocks
American Fire Glass’s black lava rocks for fire pits are a simple product with a 76% 5-star rating among customers.
These 1/2-1 inch sized rocks are a fitting top layer over finer rocks in a propane or gas fire pit.
They will retain the heat needed to sustain the flame. With distance from the bottom of the fire pit, there will be no risk of overheating.
American Fire Glass also sells them at a reasonable price and quantity, so you can use the ten pounds of rocks you get with the order for other purposes around the home.
Some customers report chiseling them to make them fit for other purposes too, which is easier to do with the medium rocks they produce.
Smaller amounts could be used with small portable propane fire pits.
3. Midwest Hearth Lava Stones For Fire Pit
Midwest Hearth’s black lava stones have a lovely rounded appearance, giving them an aesthetic edge over other fire pit rocks.
Lava rocks are not naturally rounded like this. These stones likely went through a rock tumbler to achieve this finish, and the extra processing is why you’ll pay a bit more for them.
However, they are more expensive, up to double the cost of previously mentioned lava rocks, for fulfilling the same function and being sold in the same 10-lb sets.
Though reviews about their ability to keep a fire going are raving, about 20 percent of customers mention that the rocks are not as big as advertised. Many bags are often of smaller rocks and fail to fill a fire pit.
While these lava stones for a fire pit might be a great top layer above lava gravel, given the cost and inconsistent sizing, we might recommend you buy other products to fill your fire pit table or bowl.
4. Stanbroil Volcanic Lava Rocks
Stanbroil’s black and red fire pit lava rocks are in the middle of the price range. Both types are packaged in 10-lb bags and are sized 1-2 inches.
Most reviews state that these are not only great lava rocks for propane fire pits and enhance the capabilities of such fire pits; they also arrive true to the advertised size.
You can use them, as many customers have, by chiseling them into smaller rocks to fill the bottom or leave them as they are.
Either way, these lava rocks will spice up your fire pit for less than Midwest Hearth’s Lava Stones. However, take the same precautions recommended earlier, and rinse and try them.
When they trap water, that typically produces the explosions or ruptures that customers report. When they are dry, they maintain a fire and will very rarely overheat.
5. Hiland Fire Pit Glass
This fire pit media solution may be the most interesting of the group, and it has the most ratings for a single product out of them, topping 12,000.
With several color choices that range from clear to black, they give a fire pit a beautiful appearance, particularly when choosing blue. Additionally, very rarely do customers report issues with broken or popping glass, though there are reviews that describe these problems.
The most common complaint is one that is easily resolved. With high temperatures, the flames will sometimes leave a black coating on some of the rocks.
This is normal and does not pose a danger. If you follow rinsing and washing protocols for them, this black coating goes away.
Among alternatives to lava rocks, fire pit glass is likely your best choice, though it may cost a little more than bulk quantities of lava rocks.
What is lava rock?
Lava rock is a naturally occurring stone formed from the cooled lava of an erupted volcano.
Known in geology as igneous or volcanic rocks, they form when lava cools quickly in the open air. This cooling process produces their porous surface and the frequent presence of other heat-resistant materials or minerals.
The most common Lava rock and the one used for fire pits is none other than pumice stones.
Pumice stones, commercially called lava rocks, are among the most versatile naturally occurring rocks for household purposes.
Pumice stones can:
- Help remove impurities from water
- Help trap water for your plants
- Amplify the abilities of your grill
Most importantly for our purposes, they can advance the capability of your fire pit.
Lava rocks are generally more sustainable materials to use for a propane or gas fire pit because they can be used several times, unlike wood or charcoal. Wood or charcoal will only burn once and then cannot be used again.
Since they were already formed from extreme temperatures, lava rocks are naturally heat-resistant and will not burn when exposed to the high temperatures of a propane-fueled fire pit.
Lava rocks can also protect the interior surfaces of your pit from damage due to extreme temperatures.
That’s because though they retain heat, they still keep the flame above them away from the interior of the fire pit. Thus, they have become a choice material for many fire-pit owners who seek to use more durable, reliable materials.
To use them safely, though, you must remember that their pores can trap water in addition to heat.
If they trap moisture and you start a fire, the heat produces steam at a very high temperature. It is the escape process of this steam that can crack lava rocks or cause them to explode.
Therefore, cover your fire pit when it is not in use to keep water out and assure that your lava rocks are dry before use.
How to add lava rock to a fire pit
How you add your lava rocks to your fire pit will depend on how you wish to create your fire and the size of your fire pit, but the process is usually simple.
First, you will rinse your lava rocks in your backyard with your hose.
We have mentioned this several times, but now we can get to the explanation: You are washing the dust off of them because any potential dust will cause smoke and jam the pipes of your fire pit.
Rinse them thoroughly to assure that you also get rid of any smaller pieces that can obstruct the jets or the pipes.
After taking these precautionary steps, and leaving them to dry in the sun for about six hours, then you can begin arranging them in your fire pit.
If you plan to burn wood above your lava rocks, you will arrange them so that room remains. This layer should be about 4-5 inches deep and will give the wood ample room to burn and keep your lava rocks heated.
If you only use lava rocks, you will pursue a different arrangement. At the least, you will want to fill your pit until the rock level covers or reaches the fire ring of your pit.
If you want to fill it with more rocks, there are also methods of doing this. Distribute the rocks evenly as you pour them to create a safe and even distribution of heat and flame.
If you buy lava rocks in bulk and want to use all of them to almost “overfill” the pit, there is also an arrangement for you.
But it will be safest, especially if you have a square or rectangle fire pit, to concentrate the majority of lava rocks toward the middle of the fire pit.
This way, you can assure that the flame’s heat stays concentrated in the middle and that it does not spill out onto the sides or cause danger.
Lava Rock Vs Fire Glass
Both of these materials have gained fire-pit owners’ attention because they conduct heat well and they are durable.
With the increasing use of both, a debate has sparked about which is better, and to help you decide which better suits your preferences, we will explain some similarities and differences.
Lava rocks are naturally occurring pumice stones formed from cooled lava, but fire glass is artificially manufactured.
Fire glass is a “tempered” or “fire-certified” glass that has been put through an intense heating and rapid re-cooling process. This process gives it its strength and high heat resistance; it has no risk of exploding or shattering when exposed to fires.
Fire glass, since it comes in more uniform, regulated shapes than lava rocks, can usually distribute the heat of a fire pit more evenly.
Additionally, the reflectivity and “albedo effect” from its surfaces make the heating process more efficient. In other words, heat bounces off the glass and re-enters the fire, keeping the flame going while using less gas.
Some homeowners enjoy the aesthetic appeal of fire glass and how it adds extra shine or an element of beauty to a fire. Others prefer the more rustic look of lava rocks, though lava rocks may not heat as evenly as fire glass.
Fire glass has one difference that stands out for many of its would-be users: its price.
To fill your pit, you may need up to 40 pounds of fire glass, which can cost over $80.
But if you have no problem with compromise, you can use a bottom layer of lava rocks and a top layer of fire glass.
Heat-resistant rocks for fire pits
We hope this overview of different fire pit lava rocks helps you understand how they work and that you can avoid the mishaps that result in bad reviews.
They are a more sustainable yet inexpensive material that gives your fire pit a great look while enhancing its ability to heat your backyard.
Check out these rustic fire pit ideas for inspiration on using them with your device, or check out the U-MAX propane fire pit as one example of a model that comes with rocks.
