- April 1, 1955 (Charlie Brown tells Lucy that he was Mr. Spaceman all along)
- April 2, 1955
- April 3, 1955
- April 4, 1955
- April 5, 1955
- April 6, 1955
- April 7, 1955
- April 8, 1955
- April 9, 1955
- April 10, 1955 (This strip is adapted in It's Arbor Day, Charlie Brown)
- April 11, 1955
- April 12, 1955
- April 13, 1955
- April 14, 1955
- April 15, 1955
- April 16, 1955
- April 17, 1955
- April 18, 1955
- April 19, 1955 (This gag is recycled from the Li'l Folks strip of August 17, 1947)
- April 20, 1955
- April 21, 1955
- April 22, 1955
- April 23, 1955
- April 24, 1955
- April 25, 1955
- April 26, 1955
- April 27, 1955
- April 28, 1955
- April 29, 1955
- April 30, 1955