30 Days follows former professional football player Ray Crockett as he learns about the difficulties faced by people with spinal cord injuries by spending 30 days in a wheelchair. He experiences the difficulties faced by those in wheelchairs and talks to those have experienced spinal injuries first hand.
30 Days follows a woman who opposes same-sex parenting as she spends a month with a same sex couple who is raising four adopted boys. Although she is impressed by the parenting of the couple, she remains steadfastly against the idea of a same sex parenting.
30 Days follows Pia Lalli an advocates for gun control as she spends a month with gun enthusiasts Ken and Zach Ekermeyer. Initially she is disturbed by their interest in guns, but later views it as an acceptable hobby though she does continue to believe that more must be done to stop gun-related crime.
Morgan Spurlock spends 30 days living on a Native American reservation in New Mexico. He stays with a Native American family, attempts to learn the Navajo language, and tries to become more acquainted with Navajo culture by participating in several tribal ceremonies.