The University of Oregon officially joined the Big Ten Conference on August 2, 2024, and began competing in the Big Ten in all sports starting with the 2024–25 academic year.

When the move was announced

The Big Ten Conference announced that Oregon (and Washington) would become new members on August 4, 2023. The Big Ten Council of Presidents/Chancellors voted to admit Oregon effective August 2, 2024, with competition beginning in the 2024–25 season.

Oregon’s athletic director, Rob Mullens, and university leadership confirmed the move shortly after the Big Ten’s vote, calling it a “transformational opportunity” for the Ducks.

When Oregon actually started Big Ten play

Oregon remained in the Pac‑12 for the 2023–24 season, finishing out existing media rights agreements. On August 2, 2024, the Ducks officially became a Big Ten member, and their teams began Big Ten competition in the fall of 2024 (football, volleyball, etc.) and winter/spring sports in 2024–25.

So, in short:

  • Announced: August 4, 2023
  • Official membership date: August 2, 2024
  • First Big Ten season: 2024–25

Information gathered from public forums or data available on the internet and portrayed here.