- June 1, 1978
- June 2, 1978
- June 3, 1978
- June 4, 1978
- June 5, 1978 (This strip is adapted in You're the Greatest, Charlie Brown)
- June 6, 1978
- June 7, 1978
- June 8, 1978
- June 9, 1978
- June 10, 1978
- June 11, 1978
- June 12, 1978 (Start of a series of strips which would later be adapted in the episode "A New Best Friend" from the 2014 French TV series Peanuts)
- June 13, 1978 (The first appearance of Eudora)
- June 14, 1978
- June 15, 1978
- June 16, 1978
- June 17, 1978
- June 18, 1978
- June 19, 1978
- June 20, 1978
- June 21, 1978
- June 22, 1978
- June 23, 1978
- June 24, 1978
- June 25, 1978
- June 26, 1978
- June 27, 1978
- June 28, 1978
- June 29, 1978
- June 30, 1978
| ← May 1978 | July 1978 → |