How Long To Grill Portobello Mushrooms (And Why)?

Exact Answer: 3 To 4 Minutes On Each Side

Grilling is a great way to add some flavor and texture to the favorite mushrooms. A great example, grilled portobello mushrooms are delicious on their own or as part of an entree with rice, pasta, or vegetables. 

If one grills them too quickly, then the outside will be charred while the inside will still be raw. One can also grill other vegetables like asparagus or zucchini alongside the mushrooms if one likes until it’s tender on each side. Grill them whole or slice them into large pieces first, depending on how one uses them later.

How Long To Grill Portobello Mushrooms

How Long To Grill Portobello Mushrooms?

Cooking MethodTime
On the grill3 to 4 minutes on each side
In the oven20 minutes

It takes 3 – 4 minutes on the grill to grill portobello mushrooms.

The best temperature range is between 380° F and 400° F degrees Fahrenheit. When grilling, make sure to cut the meat into 1/2 inch cubes before cooking, oil them, and brush with balsamic vinegar after cooking.

Experts recommend at least 3 to 4 minutes per side at a distance of about 5 inches.

Begin grilling the mushrooms on the uppermost rack, finish them by turning them over to go directly under the upper-most heat source, but this time to achieve grill marks. 

Cook them until they’re nicely seared and dark around the edges. Enjoy the grilled portobellos either as an appetizer or along with their favorite vegetables for a delicious evening meal.

 If one is approaching perfectionist status, try lightly coating each mushroom cap in olive oil before cooking if desired.

If one is not comfortable working with large quantities of food on high heat, one might want to consider slicing/dicing them into small pieces.

Portobello mushrooms are extra-large, growing up to about 8 inches across. They are sold either whole or sliced and packaged in vacuum-sealed trays. Portobellos have that sort of earthy flavor that could be their favorite thing’s new best friend.

Portobello mushrooms are denser than the common button mushroom. As a result, their taste is less intense and their texture more meat-like.

Why Would Grilling Portobello Mushrooms Take So Long?

Grilling portobello mushrooms will take a long time if the mushrooms are piled on top of one another and grilled. However, it takes much less time to grill an individual mushroom when sliced in half before grilling.

It takes so long to grill mushrooms because they do not shrink much when grilled. All the same, grilling portobello mushrooms takes less than five minutes.

Portobello mushrooms are packed with flavor and likewise contain an ample amount of water, which accounts for their low shrinkage when cooked. The key is to brush the mushroom with oil on both sides before cooking them for just under five minutes per side until they are soft enough to be eaten raw or well-cooked at the centre. 

If the outside is lightly roasted but not fully peeled off, that’s appropriate too if one enjoys those flavors from a bit more crunchy texture than softened ones.

When cooked, Portobello mushrooms have a slightly meatier flavor than white button mushrooms and are used as a non-meat alternative in dishes such as vegetarian lasagna.

Like many other fungi family members, such as shiitake and cremini, portobellos release umami-rich brown glistening liquid when cooked. This flavorful emanation is also found among goji berries and tomatoes. The resulting taste is akin to classic steak sauce – rich and savory with roots that one can trace back to Neolithic times.

One can prepare portobello mushrooms the same way as standard white button mushrooms, but they have a richer flavor.


Some people taste even better than regular white button mushrooms when grilled with olive oil and herbs. However, remember that they need to trim off the brown gills before cooking.

It’s also believed they may provide benefits of immunity, cholesterol reduction, insulin management, and even cancer prevention. It’s recommended to cook them thoroughly to make sure all the toxins are degraded before consumption. 

Grilling portobello mushrooms is a quick and easy way to prepare them, but one must cook them long enough. The best thing to do is brush both sides with olive oil and season with salt and pepper before grilling each side for about 8-10 minutes or until tender. 



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Hi! I'm Nidhi.

Here at the EHL, it's all about delicious, easy recipes for casual entertaining. So come and join me at the beach, relax and enjoy the food.

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