- April 1, 1999 (Sally's final attempt at an April Fools prank.)
- April 2, 1999
- April 3, 1999
- April 4, 1999 (Lucy's psychiatry booth appears for the final time)
- April 5, 1999
- April 6, 1999
- April 7, 1999
- April 8, 1999
- April 9, 1999
- April 10, 1999
- April 11, 1999
- April 12, 1999
- April 13, 1999
- April 14, 1999
- April 15, 1999 (The final interaction between Charlie Brown and Schroeder)
- April 16, 1999
- April 17, 1999
- April 18, 1999
- April 19, 1999
- April 20, 1999
- April 21, 1999
- April 22, 1999
- April 23, 1999
- April 24, 1999
- April 25, 1999 (This strip is adapted in the documentary, Here's to You, Charlie Brown: 50 Great Years)
- April 26, 1999
- April 27, 1999
- April 28, 1999
- April 29, 1999
- April 30, 1999