"Secret of the Silent Hills," composed by William Lava, is used as the opening and ending theme for the entire season.

The first season of the television series Lassie premiered in the United States on CBS on September 12, 1954 and ran for 26 episodes until its conclusion on March 6, 1955. Produced by Robert Maxwell, the episodes follows the adventures of a female rough collie named Lassie and her young owner Jeffrey Miller. In 1958, the first through third seasons began syndication under the title "Jeff's Collie." Though the first season of Lassie has never been released completely to home video, some episodes from the first season have been released to DVD. On November 25, 2003, Classic Media released a three episode set, "Lassie: Best of Jeff's Collie," which included the series first episode, "Inheritance". A second set, "Lassie: 50th Anniversary Collection", was released on September 14, 2004 and contained 24 episodes from across the entire series. The set includes three episodes from the first season: "Inheritance", "The Lion", and "Lassie's Pups".

Season 2 of Lassie premiered on 1955-09-10.

Season 3 of Lassie premiered on 1956-09-08.

Season 4 of Lassie premiered on 1957-09-07.

Season 5 of Lassie premiered on 1958-09-06.

Season 6 of Lassie premiered on 1959-09-05.

Season 7 of Lassie premiered on 1960-09-10.

Season 8

6

.

1961

.

36 Episodes

Season 8 of Lassie premiered on 1961-09-09.

Season 9 of Lassie premiered on 1962-09-29.

Season 10 of Lassie premiered on 1963-09-28.

Season 11

6

.

1964

.

33 Episodes

Season 11 of Lassie premiered on 1964-09-05.

Season 12

6

.

1965

.

32 Episodes

Season 12 of Lassie premiered on 1965-09-12.

Season 13 of Lassie premiered on 1966-09-10.

Season 14 of Lassie premiered on 1967-09-09.

Season 15 of Lassie premiered on 1968-09-28.

Season 16 of Lassie premiered on 1969-09-27.

Season 17 of Lassie premiered on 1970-09-19.

Season 18 of Lassie premiered on 1971-10-07.

Season 19 of Lassie premiered on 1972-09-15.