How Long Do I Cook a 5 Lb Turkey Breast? | The Real Answer

A 5 lb turkey breast typically takes about 1 hour 40 minutes to 2 hours to cook at 350°F.

You’ve got a 5 lb turkey breast thawed and the recipe simply says “cook until done.” Not very helpful. Maybe you remember a vague rule about 20 minutes per pound, but that doesn’t account for bone-in or oven quirks. You need a real answer, not a guess.

The honest answer is that a 5 lb turkey breast takes roughly 1 hour and 40 minutes to 2 hours in a 350°F oven. But time is only a guide. The USDA requires the thickest part of the breast to reach 165°F for safe poultry — no exceptions. This article covers the math, the method, and the thermometer wisdom you actually need.

How Long Does a 5 Lb Turkey Breast Take in the Oven?

At 350°F, a simple starting point is about 20 minutes per pound. For a 5 lb breast, that works out to 1 hour and 40 minutes. This estimate comes from The Kitchn and aligns with many home cooks’ experience.

But bone-in turkey breast cooks slower than boneless. A bone-in 5 lb breast may need closer to 2 hours, while a boneless breast can be ready in 1 hour 20 minutes to 1 hour 45 minutes. Always check with a thermometer.

If you’re using a slow cooker, the timeline stretches dramatically. On the lowest setting, a 5 lb turkey breast can take 5 to 6 hours. That’s a different beast altogether. An oven thermometer is worth using — many ovens run hot or cold, which can shift your cooking time by 15 minutes or more.

Why Time Alone Isn’t Enough

Time-based recipes fail because they assume a perfect world: exact oven temperature, exact shape, exact starting temperature. In reality, your turkey breast and your neighbor’s could differ by half an hour just because of how they were trimmed. That’s why professional kitchens rely on temperature, not time. Here are the biggest factors that affect your cooking time.

• Oven temperature varies: Most ovens run hot or cold by 25°F or more. An oven thermometer is your best friend for accurate results.
• Shape matters: A long, thin breast cooks faster than a thick, compact one. The heat penetrates more quickly to the center of a slender cut.
• Bone vs. boneless: Bones conduct heat differently and add mass, extending cooking time by 20 to 30 minutes for a 5 lb breast.
• Starting temperature: A breast straight from the fridge takes longer than one that has rested at room temperature for 30 minutes (not recommended for safety, but a fact of physics).
• Thermometer accuracy: An instant-read thermometer gives you the truth. Don’t guess; measure the thickest part, near but not touching bone.

Each of these variables can shift your finish time by 15 to 30 minutes. That’s why the smart cook trusts temperature over time.

Bone-In vs. Boneless: A Crucial Difference

The biggest decision you make is whether to leave the bone in. Bone-in turkey breast offers more flavor and moisture, but it takes longer to cook. The USDA FSIS explains that the safe minimum internal temperature of 165°F applies equally to both cuts.

For a 5 lb bone-in breast at 350°F, expect 1 hour 45 minutes to 2 hours. For boneless, subtract about 20 minutes – aim for 1 hour 20 minutes to 1 hour 45 minutes. Always measure at the thickest spot, inserting the thermometer close to, but not touching, the bone.

Some recipes recommend pulling the turkey at 155°F, relying on carryover cooking to climb to 165°F during rest. That technique works well if your oven is accurate and you rest the meat for 20 to 30 minutes.

These estimates assume a fully thawed breast. Frozen breasts will need significantly more time — always thaw in the refrigerator before cooking for even results and safety.

The Best Oven Temperature: 350°F vs. 325°F

Your oven temperature choice affects not just cooking time but also the tenderness of the meat. A hotter oven browns the skin faster but can dry out the lean breast. A lower oven is more forgiving and reduces the risk of overcooking. Here are the key considerations.

1. 350°F is faster and crisper: Higher heat browns the skin faster. Your 5 lb breast may finish in 1.5 hours, but it’s easier to dry out the lean meat.
2. 325°F is more forgiving: Simply Recipes calls it the “sweet spot.” The gentler heat cooks the meat through without the risk of a dry, chalky texture. It may take 15 to 30 minutes longer.
3. Hybrid method works well: Start at 425°F for 30 minutes to brown the skin, then reduce to 325°F for the remainder. This gives you color and tenderness.
4. Carryover cooking matters at both temps: Pull the breast at 155°F to 160°F and let it rest. The temperature will climb to 165°F during rest.

Your choice depends on your schedule and your tolerance for risk. If you’re new to turkey, 325°F is a safer bet for moist meat.

The Resting Stage: Don’t Skip It

After the turkey breast comes out of the oven, the cooking isn’t over. The internal temperature continues to rise by 5°F to 10°F over the next 20 to 30 minutes. That’s carryover cooking, and it’s why many chefs recommend pulling at 155°F.

The resting time also lets juices redistribute. Slice too soon and the moisture runs out onto the cutting board, leaving dry meat. The Kitchn’s 20 minutes per pound guide is a helpful starting point for time, but don’t skip the rest.

How long to rest? Sources vary from 10 minutes (Shady Brook Farms) to 20–30 minutes (Mom’s Kitchen Handbook). For a 5 lb breast, 15–20 minutes under a loose foil tent is a good compromise. Some cooks worry the meat will get cold, but a loose foil tent keeps it warm while allowing air circulation. Don’t wrap tightly or the skin will steam.

The Bottom Line

For a 5 lb turkey breast, plan on 1 hour 40 minutes to 2 hours at 350°F, but let the thermometer be your guide. Bone-in takes longer, boneless is faster, and resting is non-negotiable. Use a reliable instant-read thermometer and pull the breast at 155–160°F for juicy meat that reaches safe temps while resting.

Trust your thermometer over the 20-minutes-per-pound rule you started with — it’s the only way to guarantee a perfectly cooked 5 lb turkey breast every time. For personalized advice on safe handling and leftovers, the USDA Meat and Poultry Hotline (1-888-674-6854) is a free resource.