- May 1, 1978
- May 2, 1978
- May 3, 1978
- May 4, 1978 (End of a series of strips which were later adapted as the episode "La belle et la bête" from the 2014 French TV series Peanuts and as the segment "Sally and Snoopy" of the 1983 The Charlie Brown and Snoopy Show episode "Linus and Lucy")
- May 5, 1978
- May 6, 1978
- May 7, 1978
- May 8, 1978
- May 9, 1978
- May 10, 1978
- May 11, 1978
- May 12, 1978
- May 13, 1978
- May 14, 1978
- May 15, 1978
- May 16, 1978
- May 17, 1978
- May 18, 1978
- May 19, 1978
- May 20, 1978
- May 21, 1978 (This strip is adapted in the episode "A Friend Indeed" from the 2014 French TV series Peanuts)
- May 22, 1978
- May 23, 1978
- May 24, 1978
- May 25, 1978
- May 26, 1978
- May 27, 1978
- May 28, 1978 (This strip is adapted in the segment "Sally at School" from The Charlie Brown and Snoopy Show episode "Chaos in the Classroom")
- May 29, 1978
- May 30, 1978 (This strip implies that the Little Red-Haired Girl, who had moved away on July 18, 1969, is back in the neighborhood. This is confirmed in the strip from December 27, 1978)
- May 31, 1978
| ← April 1978 | June 1978 → |