Blackmon, 20, was arrested at 3:45 a.m. while driving 92 mph in a 60 mph zone on I-35 North in Carrollton, according to the Tulsa World report.
The Cowboys did not practice Monday and Blackmon and at least one other teammate made the trip to Dallas to see former OSU teammate Dez Bryant play for the Dallas Cowboys in a Monday night football game against the New York Giants.
Blackmon posted a $375 bond and was released from jail at 8:06 a.m. Tuesday. Carrollton police officials said the $375 fine would be the fine for the underage DUI charge.
Blackmon has caught 62 passes for 1,112 yards and 14 touchdowns for the 20th-ranked Cowboys (6-1).