- September 1, 1998 (This strip is adapted in the episode "Off Key" from the 2014 French TV series Peanuts)
- September 2, 1998
- September 3, 1998
- September 4, 1998
- September 5, 1998
- September 6, 1998 (This strip is adapted in I Want a Dog for Christmas, Charlie Brown. Spike replaces Snoopy)
- September 7, 1998
- September 8, 1998
- September 9, 1998
- September 10, 1998
- September 11, 1998 (This strip is adapted in I Want a Dog for Christmas, Charlie Brown)
- September 12, 1998
- September 13, 1998
- September 14, 1998
- September 15, 1998
- September 16, 1998
- September 17, 1998
- September 18, 1998
- September 19, 1998
- September 20, 1998
- September 21, 1998
- September 22, 1998
- September 23, 1998
- September 24, 1998
- September 25, 1998
- September 26, 1998
- September 27, 1998 (The thirtieth reference to Zamboni)
- September 28, 1998
- September 29, 1998
- September 30, 1998
