How Long to Cook London Broil on Pellet Grill (Beginner-Friendly Guide)

If you’ve ever stood in front of your grill wondering how long to cook London broil on a pellet grill, you’re not alone. I asked myself the same question the first time I brought this lean, budget-friendly cut home.

London broil has a reputation for being tough, but when it’s cooked properly on a pellet grill, it becomes surprisingly juicy, smoky, and packed with beefy flavor.

What I love about using a pellet grill is the control. You get steady heat, real wood smoke, and the flexibility to cook low and slow before finishing hot for a beautiful crust. This method takes the guesswork out of the process and delivers consistent results, even if you’re not a grill master yet.

In this guide, I’ll walk you through exactly how long to cook London broil on a pellet grill, what temperature to use, how to season it, and the little details that make a big difference. By the end, you’ll feel confident serving this dish to family or guests without worrying about dryness or chewiness.

Ingredients

• 1 large London broil (about 2½–3 pounds)
• 3 tablespoons olive oil
• 2 tablespoons soy sauce or Worcestershire sauce
• 3 cloves garlic, minced
• 1 teaspoon kosher salt
• 1 teaspoon freshly ground black pepper
• 1 teaspoon smoked paprika
• ½ teaspoon onion powder
• ½ teaspoon dried thyme or rosemary
• Optional: 1 tablespoon brown sugar for mild sweetness

Instructions: How Long to Cook London Broil on Pellet Grill

This section is where everything comes together. If you’re specifically searching for
how long to cook London broil on a pellet grill, bookmark this part.
I follow this exact method every time, and it hasn’t failed me yet.

1. Marinate the London broil.
   In a small bowl, whisk together olive oil, soy sauce, garlic, salt, pepper, smoked paprika, onion powder, thyme, and brown sugar if using. Place the London broil in a large zip-top bag or shallow dish and coat it evenly with the marinade. I recommend marinating for at least 4 hours, but overnight (up to 24 hours) gives the best flavor and tenderness.
2. Preheat the pellet grill.
   Set your pellet grill to 225°F. This low temperature allows the meat to absorb smoke and cook gently. I usually use hickory or oak pellets, but mesquite works if you like a stronger smoke flavor.
3. Bring the meat to room temperature.
   Remove the London broil from the fridge about 30 minutes before cooking. This helps it cook more evenly on the grill.
4. Start the low-and-slow cook.
   Place the London broil directly on the pellet grill grates. Close the lid and cook at 225°F for about 35–45 minutes, or until the internal temperature reaches 110–115°F for medium-rare.
   This step is key when deciding how long to cook London broil on a pellet grill without drying it out.
5. Increase the heat for searing.
   Turn the pellet grill up to 450–500°F. Let it preheat for 10–15 minutes. This high heat creates a flavorful crust on the outside.
6. Sear the London broil.
   Sear the meat for 3–5 minutes per side, until the internal temperature reaches:
   • 125–130°F for medium-rare
   • 135–140°F for medium

   I strongly recommend using a meat thermometer for accuracy.

7. Rest before slicing.
   Remove the London broil from the grill and let it rest for 10 minutes. This allows the juices to redistribute, keeping the meat moist.
8. Slice against the grain.
   This step matters just as much as knowing how long to cook London broil on a pellet grill. Slice thinly against the grain for the most tender bite.

Tips or Variations for Pellet-Grilled London Broil

Don’t skip the marinade

London broil is a lean cut, usually top round or flank steak. Marinating helps break down muscle fibers and adds flavor. If you’re short on time, even 1–2 hours is better than nothing.

Choose the right internal temperature

Overcooking is the biggest mistake people make. If you’ve ever thought London broil was too tough, it was probably cooked past medium. For best results, stick to medium-rare or medium.

Experiment with pellet flavors

Hickory and oak are my go-to choices, but cherry adds a mild sweetness, and pecan gives a rich, nutty aroma. Pellet choice won’t change how long to cook London broil on a pellet grill, but it does change the final flavor.

Simple seasoning variation

If you don’t want to marinate, you can use a dry rub of salt, pepper, garlic powder, and smoked paprika. Just know that marinating gives a more tender result.

Serving ideas

I love serving pellet-grilled London broil sliced thin with roasted potatoes, grilled vegetables, or even in sandwiches the next day. Leftovers also work great in salads or wraps.

Conclusion: Mastering How Long to Cook London Broil on Pellet Grill

Once you understand how long to cook London broil on a pellet grill, this cut
becomes a reliable and impressive option for weeknights or special occasions. The combination of low-and-slow smoking followed by a hot sear delivers tender meat with deep, smoky flavor.

I encourage you to try this method at least once and adjust the seasoning or pellet choice to suit your taste. Cooking is all about confidence and practice, and this recipe is a great way to build both. If you follow these steps and pay attention to temperature instead of just time, you’ll end up with a London broil you’re proud to serve.

Fire up your pellet grill, trust the process, and enjoy every juicy slice. Happy grilling!