1978 is the first year of syndicated Garfield strips. These were predated by Jon comics printed in 1976, 1977, and 1978.
- July 1, 1978: (Garfield watches television for the first time.)
- July 2, 1978:
- July 3, 1978:
- July 4, 1978: (Garfield's first interaction with fish.)
- July 5, 1978:
- July 6, 1978: (This strip is adapted in Here Comes Garfield.)
- July 7, 1978: (Garfield claws curtains for the first time.)
- July 8, 1978: (Garfield reads his first fan letter.)
- July 9, 1978: (Jon angrily says Garfield's name for the first time.)
- July 10, 1978: (Garfield claws furniture for the first time.)
- July 11, 1978:
- July 12, 1978:
- July 13, 1978:
- July 14, 1978:
- July 15, 1978: (Garfield encounters lasagna for the first time.)
- July 16, 1978:
- July 17, 1978:
- July 18, 1978:
- July 19, 1978: (The first time Garfield interacts with a mailman. It is not Herman Post however, as that character will not make his debut until 1984.)
- July 20, 1978:
- July 21, 1978: (This strip is animated in The Fantastic Funnies.)
- July 22, 1978:
- July 23, 1978: (Garfield interacts with a dog for the first time.)
- July 24, 1978: (Jon insults Garfield for the first time.)
- July 25, 1978:
- July 26, 1978:
- July 27, 1978: (This strip would become a popular internet meme.)
- July 28, 1978:
- July 29, 1978:
- July 30, 1978:
- July 31, 1978: (Garfield interacts with a Girl Scout for the first time, and his design has started to slowly refine.)
| ← Garfield, June 1978 | Garfield, August 1978 → |