With so much uncertainty still surrounding the Spurs roster, it feels odd to start thinking about next season, but the first sign that it will eventually come is the release their 2018 preseason schedule, which will begin on September 30 and feature three home games and two away games.
(All times are in Central Standard.)
It is not yet clear if any of the games will be televised (although they are usually streamed through NBA League Pass). Per the official press release:
All preseason games can be heard on WOAI-AM 1200 with Bill Schoening calling the action.