- Begin by trimming any excess fat from the tri-tip roast. You want a nice, even layer of fat that will render down during cooking. 
- In a mixing bowl, combine olive oil, garlic powder, onion powder, paprika, salt, black pepper, oregano, and thyme. 
- Rub this mixture evenly over the tri-tip, ensuring every inch is covered. For the best flavor, let the tri-tip marinate for 1-2 hours in the refrigerator. However, if you're short on time, you can cook it immediately. 
- If you're using a charcoal grill, prepare for both direct and indirect heat. For a gas grill, preheat to medium-high heat. Ensure the grill is clean and well-oiled to prevent sticking. 
- Place the tri-tip on the grill over direct heat. Sear each side for 5-7 minutes until a nice crust forms. 
- Move the tri-tip to indirect heat, cover the grill, and cook for another 20-30 minutes, flipping occasionally. 
- Use a meat thermometer to check the internal temperature. For medium-rare, aim for 130°F (54°C); for medium, go for 140°F (60°C). 
- Once the tri-tip reaches your desired doneness, remove it from the grill and wrap it loosely in aluminum foil. Let it rest for 10 minutes to allow the juices to redistribute. 
- Unwrap the tri-tip and place it on a cutting board. Slice against the grain for the most tender bites. Serve with your favorite sides and enjoy!