- September 1, 1968
- September 2, 1968
- September 3, 1968
- September 4, 1968 (This strip and the following strip are adapted in It Was a Short Summer, Charlie Brown)
- September 5, 1968
- September 6, 1968
- September 7, 1968
- September 8, 1968
- September 9, 1968
- September 10, 1968
- September 11, 1968
- September 12, 1968
- September 13, 1968
- September 14, 1968
- September 15, 1968 (This strip is adapted in the segment "Beads" of the 1983 The Charlie Brown and Snoopy Show episode "Linus and Lucy")
- September 16, 1968 (This strip is adapted in the episode "Out of Order" from the 2014 French TV series Peanuts)
- September 17, 1968
- September 18, 1968
- September 19, 1968
- September 20, 1968
- September 21, 1968 (This strip is adapted in the segment "Teaching" from The Charlie Brown and Snoopy Show episode "Snoopy's Football Career")
- September 22, 1968
- September 23, 1968
- September 24, 1968
- September 25, 1968
- September 26, 1968 (quotes line from song A Taste of Honey)
- September 27, 1968
- September 28, 1968
- September 29, 1968 (Football gag for 1968. This strip is adapted in A Charlie Brown Thanksgiving and the segment "Football" of the 1983 The Charlie Brown and Snoopy Show episode "Linus and Lucy". The fifth and sixth panels on the strip are possibly adapted in A Boy Named Charlie Brown)
- September 30, 1968
| ← August 1968 | October 1968 → |