How Long to Cook Pork Shoulder (Slow Roast)
Bone-in or boneless pork shoulder (Boston butt) for roasting, braising, or slow cooking.
The Short Answer
The USDA-recommended safe internal temperature is 145°F, verified with an instant-read thermometer in the thickest part. Scroll down for all cooking methods, detailed instructions, and tips from the Professor.
Always verify with an instant-read thermometer inserted into the thickest part.
Cooking Methods
🔥 Oven
Temperature: 300°F
Rest: 30 minutes
Low and slow at 300°F. For shreddable pulled pork, cook until 195-205°F internal. For sliceable roast pork, pull at 180°F. Time depends on weight.
Time by Weight
| Weight | Cook Time |
|---|---|
| 4–6 lbs | 3.5–5 hours |
| 6–8 lbs | 5–7 hours |
| 8–10 lbs | 7–9 hours |
⚡ Instant Pot / Pressure Cooker
Pressure: High
Time: 60–90 minutes
Release: Natural release 15 minutes
The Instant Pot turns a 10-hour slow cooker recipe into 60-90 minutes. Use about 15 minutes per pound. Add 1 cup liquid. The meat should shred easily with two forks.
Pork shoulder is the most forgiving roast in the kitchen. High fat content makes it nearly impossible to dry out. Low heat and patience are all you need. Do not rush it with higher heat.
Frequently Asked Questions
They are the same cut. Boston butt is the upper portion of the shoulder. Both work identically for pulled pork, roasting, and braising.
The Bottom Line
Pork Shoulder (Slow Roast) is straightforward to cook when you know the time and temperature. The most important number to remember is 145°F internal. An instant-read thermometer is the only reliable way to confirm doneness; color and firmness are not accurate indicators. Use the method that fits your equipment and schedule, and always let the food rest before cutting or serving. Resting allows juices to redistribute and carryover cooking to finish the job.
Source: USDA Safe Minimum Internal Temperatures | Last verified: March 19, 2026 | Our methodology