- May 1, 1998
- May 2, 1998
- May 3, 1998
- May 4, 1998
- May 5, 1998
- May 6, 1998
- May 7, 1998
- May 8, 1998
- May 9, 1998
- May 10, 1998 (Final Mother's Day comic strip)
- May 11, 1998 (Beginning of a storyline that was later adapted in A Charlie Brown Valentine)
- May 12, 1998
- May 13, 1998
- May 14, 1998
- May 15, 1998
- May 16, 1998
- May 17, 1998
- May 18, 1998
- May 19, 1998
- May 20, 1998
- May 21, 1998 (Snoopy identifies himself as the Scott Fitzgerald Hero)
- May 22, 1998
- May 23, 1998
- May 24, 1998
- May 25, 1998 (The Little Red-Haired Girl is seen in silhouette. Snoopy quotes from F. Scott Fitzgerald's The Great Gatsby.)
- May 26, 1998
- May 27, 1998
- May 28, 1998 (Ending of a storyline that was later adapted in A Charlie Brown Valentine)
- May 29, 1998
- May 30, 1998
- May 31, 1998 (This strip commemorates the June 1944 Normandy landings. It is made up primarily of a photograph of Dwight D. Eisenhower and men of the 502nd Infantry Regiment. It is a rare Peanuts strip in which adults appear. This photograph previously appeared in the episode "The Music and Heroes of America" of This Is America, Charlie Brown)
