Perfect Grilled Sweet Corn | Preheat the grill to 500 F. Trim the silk off the tops of each ear. Do not shuck the ears. Place the ears on the grill and turn the flames down so they do not touch the ears. Grill for 30 minutes, turning every 10. Remove from the grill and let cool for at least 10 minutes. Be careful, the ears are very hot! Carefully peel back the husk. Spread it with butter and salt.