Quick answer for how long to grill filet mignon: 3-5 minutes per side.
Filet mignon is one of the finest cuts of beef. It is a high end tenderloin that is generally grilled and served rare to medium rare. To truly enjoy a grilled filet mignon steak, the internal center needs to be pink or red. If you prefer your meat served well done, please find another cut of beef.
Over a pre-heated hot grill, place the filets down over direct heat for no more than six minutes per side while flipping the beef only once. The degree of doneness will determine exactly how long you should grill the filet. You are essentially simply searing both sides of the meat. When the steak is finished grilling take the filet mignon off the grill and let the meat sit and breathe for an additional ten minutes. This will ensure the juices and tenderness of the meat will be fully sealed within. Do not be in a rush to break the seal and cut into the meat, it’s worth the wait.
If you are using a meat thermometer to check the internal temperature of your filet tenderloin, please refer to the following chart.
Rare – 130 to 140 degrees. The meat will have a lot of give to the touch.
Medium Rare – 140 to 150 degrees. The filet will a slight firmness but will still give in to the touch.
Medium – 150 to 160 degrees. Firm beef. If this is your preferred level of cooked beef, a ribeye or sirloin cut would be more towards your liking.