The 99th Summer Koshien Steering Committee held a meeting in Osaka on November 2. A number of details were released.
- The tournament will take place over a fifteen-day period that begins on August 7 at Koshien Stadium.
- Forty-nine schools will participate in the tournament. Two schools will be selected from Hokkaido and Tokyo.
- Brackets will be selected on August 4, 2017 at 16:00 at Festival Hall in Osaka.
Source: Nikkan Sports 11/2/2016