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How Long to Cook Leg of Lamb (Bone-In)

1 cooking method with times, temperatures, and tips. Safe to 145°F (USDA FSIS).

Roast

Leg of Lamb (Bone-In)

Cook Time

140-210 min

Set Roast To

325°F

cooking temperature

Safe Internal Temp

145°F

63°C · USDA FSIS

Preheat Roast before cooking

Cooking Tips

  • Make slits and insert garlic and rosemary
  • Season generously with herbs and olive oil
  • Rest at least 20 minutes before carving

Rest for 20 minutes before serving

Resting allows juices to redistribute for a moister result.

Roast Temperature Options

TemperatureCook Time
325°Frecommended140-210 min
350°F120-180 min

Leg of Lamb (Bone-In) Doneness Guide

LevelInternal TempDescription
rare°FCool red center
medium rare°FWarm red center
medium°FWarm pink center
medium well°FSlight pink center
well done°FNo pink, fully cooked

Adjust Cooking Time by Weight

Adjust for Weight

112oz
80 oz144 oz

Adjusted cooking time

140-210 min

All 1 Ways to Cook Leg of Lamb (Bone-In)

Kitchen Timer

Kitchen Timer

175:00

175 min preset

min
:
sec

Frequently Asked Questions

How long does it take to cook Leg of Lamb (Bone-In)?

Leg of Lamb (Bone-In) typically takes 140-210 minutes using the Oven method at 325°F. Times vary by cooking method and weight.

What temperature should Leg of Lamb (Bone-In) be cooked to?

Leg of Lamb (Bone-In) must reach an internal temperature of 145°F (63°C) according to USDA FSIS guidelines. Always verify with a meat thermometer.

What is the best method to cook Leg of Lamb (Bone-In)?

Leg of Lamb (Bone-In) can be prepared using 1 different methods: Roast. The most popular method is Roast.

Can I cook Leg of Lamb (Bone-In) from frozen?

Yes, you can cook Leg of Lamb (Bone-In) from frozen. Add approximately 50% more cooking time (multiply by 1.5x). Always verify the internal temperature reaches the safe minimum before serving.

How do I know when Leg of Lamb (Bone-In) is done?

The most reliable way to check doneness is using an instant-read meat thermometer. Leg of Lamb (Bone-In) is done when the internal temperature reaches 145°F (63°C). Do not rely on color alone.