After graduating from Fort Atkinson High School in Wisconsin, Offerdahl played college football for Western Michigan University and was drafted in the second round in the 1986 NFL Draft. While at WMU Offerdahl recorded 694 career tackles, still a school record. Offerdahl was inducted into the MAC Hall of Fame in 2013.
While attending Western Michigan he was a member of Sigma Alpha Epsilon. He graduated with a bachelor of science degree in biochemistry. He and his wife Lynn live in Fort Lauderdale with their three children, Alexandra, Drew and Jameson.