Preheat your grill to medium-high heat, about 375 to 400 degrees F.
Rip large pieces of foil for each ear of corn you're cooking.
Place one ear of corn on each piece of heavy duty foil, double wrap the corn if using regular foil.
Mix together the unsalted butter, lime juice, lime zest, finely chopped cilantro leaves, grated garlic, kosher salt and black pepper in a small bowl.
Use a brush or back of a spoon to smooth some of the herbed butter mixture all over each ear of corn.
Fold the foil around the corn, crimping the edges at the top to enclose it completely.
Place the foil wrapped corn in your preheated grill, close the grill, and let cook for 15 minutes. Turn them or move to indirect heat for another 10 minutes.
Remove the foil packets from the grill with tongs, remove the corn from the foil, and serve hot with more garlic cilantro lime butter.