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Season 1 of Hawaii Five-O premiered on September 20, 1968.

The first season of Hawaii Five-O, an American television series, began September 20, 1968, and ended on March 19, 1969. It aired on CBS. The region 1 DVD was released on March 6, 2007.

Season 2 of Hawaii Five-O premiered on September 24, 1969.

The second season of Hawaii Five-O, an American television series, began September 24, 1969, and ended on March 11, 1970. It aired on CBS. The region 1 DVD was released on July 31, 2007.

Season 3 of Hawaii Five-O premiered on September 16, 1970.

The third season of Hawaii Five-O, an American television series, began September 16, 1970, and ended on March 10, 1971. It aired on CBS. The region 1 DVD was released on January 22, 2008.

Season 4 of Hawaii Five-O premiered on September 14, 1971.

The fourth season of Hawaii Five-O, an American television series, began September 14, 1971, and ended on March 7, 1972. It aired on CBS. The region 1 DVD was released on June 10, 2008.

Season 5 of Hawaii Five-O premiered on September 12, 1972.

The fifth season of Hawaii Five-O premiered on September 12, 1972 and ended March 13, 1973. 24 episodes aired during this season. The Region 1 DVD was released on November 18, 2008.

Season 6 of Hawaii Five-O premiered on September 11, 1973.

The sixth season of Hawaii Five-O premiered on September 11, 1973 and ended February 26, 1974. 24 episodes aired during this season. The Region 1 DVD was released on April 21, 2009.

Creator and executive producer Leonard Freeman died during this season.

Season 7 of Hawaii Five-O premiered on September 10, 1974.

Season 8 of Hawaii Five-O premiered on September 12, 1975.

Season 9 of Hawaii Five-O premiered on September 30, 1976.

Season 10 of Hawaii Five-O premiered on September 15, 1977.

Season 11 of Hawaii Five-O premiered on September 28, 1978.

Season 12 of Hawaii Five-O premiered on October 4, 1979.