New England Patriots
Ohrnberger was drafted by the New England Patriots in the fourth round of the 2009 NFL Draft, with a pick they ultimately obtained from trading cornerback Ellis Hobbs to the Philadelphia Eagles. He signed a four-year, $2.20 million contract on June 16, 2009. The deal included a $451,000 signing bonus. Ohrnberger was active for three games for the Patriots in 2009, seeing time at right guard with starter Stephen Neal injured and backup Dan Connolly lining up at fullback.
Ohrnberger was waived by the Patriots during final cuts on September 4, 2010. He cleared waivers and was re-signed to the team's practice squad the next day. He was promoted to the 53-man roster on September 29, 2010, before the team's Week 4 game. He was active for two games in the 2010 season, both as a reserve.
Arizona Cardinals
Ohrnberger signed a contract with the Arizona Cardinals on August 1, 2012.
San Diego Chargers
Ohrnberger signed with the San Diego Chargers on March 21, 2013.