The guard was selected by a panel of conference media after a strong freshman season in which he averaged 16.2 points and helped the Terrapins win 28 games.
Trimble was also a unanimous preseason all-conference pick along with Michigan State's Denzel Valentine, Purdue's A.J. Hammons and Wisconsin's Nigel Hayes. Indiana's James Blackmon Jr., and Yogi Ferrell, Iowa's Jarrod Uthoff, Maryland's Jake Layman, Michigan's Caris LeVert and Wisconsin's Bronson Koenig also earned preseason all-Big Ten honors.
The selections were announced Wednesday.