Do you put pork roast on rack when in oven?

It depends.

Pork roast is naturally tender, so it doesn’t need to be cooked long at a high temperature to tenderize it. It is ideal for roasting at a low temperature for a longer time.

Pork roasts are typically served well done, so it’s important to use a meat thermometer to ensure the roast reaches an internal temperature of at least 145°F. Some cuts, like pork shoulder and pork butt, can be cooked to a higher temperature, up to 195°F, to achieve a “fall-apart” texture.

For best results, it is recommended to use a roasting rack when cooking pork roast in the oven. A roasting rack allows air to circulate around the meat, which helps to promote even cooking and prevents the meat from sticking to the pan. If you don't have a roasting rack, you can also place the pork roast on a bed of vegetables or on a wire rack set inside a roasting pan.