"After a lot of prayer and thought, I'm excited to announce my commitment to Oregon State University! I can't wait to be apart of this amazing program, it is definitely something special," she wrote on Twitter.
Slocum, who was named the Women's Basketball Coaches Association's National Freshman of the Year after helping lead the Terps to the Big Ten Conference tournament title and a Sweet 16 appearance, announced in early April that she was transferring from Maryland.
Corvallis, Ore., is about 430 miles from Slocum's hometown of Meridian, Idaho. During the season, Slocum told The Baltimore Sun that she initially thought Maryland was too far away from her family; as a highly touted point guard, she initially committed to Washington.
Slocum reportedly visited Arkansas, which last month hired former Washington coach Mike Neighbors, before deciding on the Beavers. Oregon State has won three straight Pac-12 Conference regular-season titles and advanced to the Final Four in 2016.
Under NCAA rules, Slocum, who averaged 11.5 points and six assists per game for the Terps, will have to sit out next season before regaining her eligibility. Maryland hopes it has a potential replacement in Channise Lewis, a four-star point guard recruit who signed with the program last week.