- April 1, 1988
- April 2, 1988 (The first Peanuts daily strip in the single-frame format)
- April 3, 1988
- April 4, 1988
- April 5, 1988
- April 6, 1988
- April 7, 1988
- April 8, 1988
- April 9, 1988
- April 10, 1988
- April 11, 1988
- April 12, 1988
- April 13, 1988
- April 14, 1988
- April 15, 1988
- April 16, 1988 (The first Peanuts daily strip with the 2 frames format)
- April 17, 1988
- April 18, 1988
- April 19, 1988
- April 20, 1988
- April 21, 1988
- April 22, 1988
- April 23, 1988
- April 24, 1988
- April 25, 1988
- April 26, 1988
- April 27, 1988
- April 28, 1988
- April 29, 1988 (The comic strip in which Garfield is referenced)
- April 30, 1988
← March 1988 | May 1988→ |