how long to grill a tri tip
3) Light the grill and bring to medium heat (between 350 â 375 degrees). Preheat for 7-8 minutes. This is the ideal heat to cook the tri tip fully in 35-40 minutes, depending on the size of the roast.
4 Cover the grill and cook until the temperature of the interior of the tri-tip reaches 120Â°F for a rare roast, 130Â°F for medium-rare and 140Â°F for medium. At this point the meat will take anywhere from 20 to 40 minutes to cook, depending on how hot your grill is, how well done you want it, and the size of the cut.