How Long to Grill Flank Steak at 400°F (204°C)

Grilling flank steak can deliver an incredibly flavorful and satisfying result as long as the heat and timing are precise. Flank is a lean, long-fibered cut, which means it develops excellent flavor when grilled quickly over high heat. In this guide, you’ll learn why 400°F (204°C) is an ideal grill temperature, how long to grill flank steak based on level of doneness, and step-by-step instructions to achieve a tender and juicy result every time.

Flank steak has earned its popularity for good reason: it’s affordable, deeply savory, and cooks quickly. But because it’s naturally lean and contains long muscle fibers, it can become chewy if improperly cooked. Grilling at the correct temperature and for the correct length of time protects the texture and flavor of this cut.
This article explains in detail how long to grill flank steak at 400°F (204°C), how to prepare it beforehand, and how to rest and slice it for best results.

Understanding Flank Steak

Flank steak comes from the abdominal region of the cow. Unlike ribeye or strip steak, it doesn’t have substantial marbling. Instead, it’s built from long, grainy muscle fibers that deliver bold beef flavor. Because of its structure, flank steak benefits from quick, high-heat cooking and should never be overcooked.

Why Proper Cooking Matters

• Flank steak is lean, meaning it contains very little fat to create moisture.
• The long grain structure becomes tougher as internal temperature rises.
• Proper timing ensures the steak is cooked through without drying out.

Internal Temperature Guidelines

Doneness	Internal Temp (°F)	Internal Temp (°C)
Rare	120–125°F	49–52°C
Medium-Rare	130–135°F	54–57°C
Medium	135–140°F	57–60°C

Medium-rare produces a tender and moist flank steak, while medium retains a good texture but has less juiciness. Flank steak should not be cooked past medium, or it will become chewy.

Why Grill at 400°F (204°C)?

A grill temperature of 400°F (204°C) strikes the ideal balance between surface searing and internal cooking.

Advantages of 400°F (204°C)

• Produces a rich exterior crust without burning
• Allows the interior to reach proper temp without overcooking the outside
• Achieves medium-rare in roughly 4–5 minutes per side

Comparing Different Temperatures

Grill Temp	Result
300°F / 149°C	Slow cook, less sear; risk of drying out
400°F / 204°C	Ideal; even cooking and perfect crust
500°F / 260°C	Very quick sear; easy to overcook interior

Preparing the Flank Steak

Proper preparation is essential to get the best flavor and texture from flank steak.

1. Trim Excess Membrane

Use a sharp knife to carefully remove any visible silver skin or membrane. This tissue does not break down during cooking and will remain chewy if left attached.

2. Choose a Marinade or Dry Rub

Both methods can add flavor and help tenderize the meat.

• Marinades should include salt + acidic ingredients (e.g., citrus, vinegar, wine) and need 2–12 hours in the refrigerator.
• Dry Rubs offer quick flavor—simply coat the steak evenly with salt, pepper, garlic powder, and paprika 20–30 minutes before grilling.

3. Let Steak Reach Room Temperature

Remove the flank steak from the refrigerator 30–40 minutes before cooking. A steak that isn’t ice-cold will cook more evenly.

Grilling Instructions (400°F / 204°C)

1. Preheat the Grill

• Gas Grill: turn burners to medium-high and allow the grill to heat to a steady 400°F (204°C).
• Charcoal Grill: use evenly lit coals and spread them in a single layer under the cooking grate; check temperature with a grill thermometer.

2. Place the Steak on the Grill

Once the grill reaches 400°F (204°C), place the steak directly over the heat source.

3. Grill Time by Doneness

Doneness	Grill Time per Side	Total Time
Medium-Rare	4–5 minutes	8–10 minutes
Medium	5–6 minutes	10–12 minutes

Tip: Turn the steak only once to keep the surface intact and lock in juices.

4. Check Internal Temperature

Insert an instant-read thermometer into the thickest part of the steak:

• 130–135°F (54–57°C) for medium-rare
• 135–140°F (57–60°C) for medium

Resting and Slicing

Resting

Transfer the steak to a plate or cutting board and loosely tent with foil. Allow it to rest for 5–10 minutes. This step lets the juices redistribute throughout the meat.

Slicing

• Always slice across (against) the grain
• Cut into thin slices at a slight angle (bias cut)
  Cutting against the grain shortens the muscle fibers, making each bite significantly more tender.

Helpful Tips for Better Results

• Brush grill grates with neutral oil (e.g., canola) to prevent sticking
• Do not press on the steak with a spatula—this squeezes out juices
• Use tongs, not a fork, to keep juices from escaping
• Finish with a compound butter or drizzle of chimichurri after slicing for enhanced flavor

Common Mistakes to Avoid

Mistake	Why It’s a Problem
Overcooking beyond medium	Makes the steak tough and dry
Skipping rest time	Causes juices to run out when sliced
Cutting with the grain	Leaves long fibers intact and chewy
Putting a cold steak on the grill	Cooks unevenly and reduces tenderness

Serving Suggestions

Flank steak pairs well with a variety of side dishes:

Vegetable Sides

• Grilled asparagus
• Roasted bell peppers
• Zucchini or summer squash

Starches

• Baked or grilled potatoes
• Garlic mashed potatoes
• Rice pilaf

Sauces

• Chimichurri sauce (fresh herbs + olive oil)
• Red wine reduction
• Spicy salsa or roasted pepper sauce

Final Thoughts

Grilling flank steak at 400°F (204°C) provides the ideal combination of surface sear and controlled internal cooking. For a tender result, cook the steak for 4–5 minutes per side for medium-rare (130–135°F / 54–57°C), or 5–6 minutes per side for medium (135–140°F / 57–60°C).
Always let the steak rest for a few minutes after grilling and slice across the grain to enhance tenderness.

With the right temperature, timing, and slicing technique, flank steak becomes a flavorful and satisfying meal that’s quick to prepare and reliably delicious.