Lamb Leg Cook Time Calculator — Roast Timing by Weight
Calculate perfect roasting time for leg of lamb by weight, doneness, and oven temperature.
Frequently Asked Questions
What internal temperature should leg of lamb reach?
USDA minimum for lamb is 145°F (63°C) with a 3-minute rest. However, most chefs serve lamb at 135°F (medium rare) for the best flavor and tenderness. At 145°F it's medium. Well done at 165°F is safe but often considered overdone.
How long does a bone-in leg of lamb take to cook?
At 325°F, a bone-in leg takes roughly 18–22 minutes per pound for medium rare. A 5-lb leg takes about 1.5–2 hours. Boneless legs cook 15–18 minutes per pound and more evenly. Always verify with a meat thermometer.
How do I know when lamb is done?
Insert a meat thermometer into the thickest part away from the bone. For medium rare, pull at 125°F — it will rise to 135°F during the 20-minute rest. The meat should be deeply pink inside but not raw-looking.
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