Adams, who is also a two-time runner-up for the Walter Payton Award for the most outstanding offensive player in FCS, will graduate from Eastern Washington in June, after which he'll report to the Ducks as a graduate transfer.
"I love it here at Eastern, but this is what I've been dreaming about," Adams said.
Adams has had success against Pac-12 teams in the past. In 2013, he led the Eagles to a 49-46 upset of No. 25 Oregon State. In 2014, during a 59-52 loss to Washington, Adams threw for 475 yards and a school-record seven touchdowns.
Over his three-year career with the Eagles, Adams threw for 10,438 yards and 110 touchdowns, twice leading Eastern Washington to the FCS Playoff semifinals.
Adding a wrinkle to Monday's announcement is that Adams will face his old team in Week 1 when the Eagles play the Ducks on Sept. 5 in Eugene.
- Will Green