After the resting period, remove the tri-tip from the refrigerator and let it sit at room temperature for 45 minutes to 1 hour. This helps the meat cook more evenly.
Next, place the tri-tip in the smoker and cook at 300°F for approximately 1 hour. Once the internal temperature reaches 110°F, remove it from the smoker and transfer it to an open-flame grill for direct heat.
Keep the flame low—the flames should barely touch the bottom of the grill grate. Sear the tri-tip by flipping it every 3–4 minutes, continuing for about 15–30 minutes, or until the internal temperature reaches 155°F.
Once it reaches 155°F, remove the meat from the grill. Wrap it tightly in aluminum foil, then place it in an insulated container (such as an ice chest without ice) and let it rest for 15 minutes. This resting period allows the juices to redistribute, resulting in a more tender and flavorful tri-tip.