Payne County, Okla., jail logs indicated Blackmon, 22, was booked into the facility around 10 a.m. Sunday after being arrested in Stillwater on a charge of aggravated driving under the influence of alcohol, The Tulsa World reported.
The newspaper said Oklahoma law defines aggravated DUI as a charge in which the driver's blood-alcohol content is measured at .15 percent or higher.
Blackmon, a two-time unanimous All-American and No. 2 on Oklahoma State's all-time receiving yards list with 3,564 yards, was taken with the fifth overall pick by the Jaguars in the 2012 NFL Draft.
He was also arrested on a DUI charge in October 2010 in Carrollton, Texas, and was suspended for a game by Cowboys Coach Mike Gundy.
Blackmon is expected to land a deal worth $20 million overall from the Jaguars, the World reported.