Season 0 of Horizon premiered on December 25, 1966.

Season 1 of Horizon premiered on February 3, 1964.

Season 2 of Horizon premiered on January 6, 1965.

Season 3 of Horizon premiered on January 2, 1966.

Season 4 of Horizon premiered on January 17, 1967.

Season 5 of Horizon premiered on January 2, 1968.

Season 6 of Horizon premiered on January 2, 1969.

Season 7 of Horizon premiered on January 5, 1970.

Season 8 of Horizon premiered on January 4, 1971.

Season 9 of Horizon premiered on January 3, 1972.

Season 10 of Horizon premiered on January 4, 1973.

Season 11 of Horizon premiered on January 7, 1974.

Season 12 of Horizon premiered on January 20, 1975.

Season 13 of Horizon premiered on January 5, 1976.

Season 14 of Horizon premiered on January 7, 1977.

Season 15 of Horizon premiered on January 6, 1978.

Season 16 of Horizon premiered on February 26, 1979.

Season 17 of Horizon premiered on January 14, 1980.

Season 18 of Horizon premiered on January 5, 1981.

Season 19 of Horizon premiered on January 11, 1982.

Season 20 of Horizon premiered on January 10, 1983.

Season 21 of Horizon premiered on January 9, 1984.

Season 22 of Horizon premiered on January 7, 1985.

Season 23 of Horizon premiered on January 6, 1986.

Season 24 of Horizon premiered on January 5, 1987.

Season 25 of Horizon premiered on January 4, 1988.

Season 26 of Horizon premiered on January 9, 1989.

Season 27 of Horizon premiered on January 8, 1990.

Season 28 of Horizon premiered on January 7, 1991.

Season 29 of Horizon premiered on January 6, 1992.

Season 30 of Horizon premiered on January 4, 1993.

Season 31 of Horizon premiered on January 10, 1994.

Season 32 of Horizon premiered on January 9, 1995.

Season 33 of Horizon premiered on January 8, 1996.

Season 34 of Horizon premiered on February 27, 1997.

Season 35 of Horizon premiered on February 19, 1998.

Season 36 of Horizon premiered on January 28, 1999.

Season 37 of Horizon premiered on January 12, 2000.

Season 38 of Horizon premiered on January 25, 2001.

Season 39 of Horizon premiered on January 10, 2002.

Season 40 of Horizon premiered on January 9, 2003.

Season 41 of Horizon premiered on January 8, 2004.

Season 42 of Horizon premiered on January 13, 2005.

Season 43 of Horizon premiered on January 12, 2006.

Season 44 of Horizon premiered on March 13, 2007.

Season 45 of Horizon premiered on January 15, 2008.

Season 46 of Horizon premiered on January 26, 2009.

Season 47 of Horizon premiered on October 13, 2009.

Season 48 of Horizon premiered on September 26, 2010.

Season 49 of Horizon premiered on August 8, 2011.

Season 50 of Horizon premiered on July 23, 2012.

Season 51 of Horizon premiered on August 12, 2013.

Season 52 of Horizon premiered on August 17, 2014.

Season 53 of Horizon premiered on March 16, 2016.

Season 54 of Horizon premiered on January 19, 2017.

Season 55 of Horizon premiered on February 5, 2018.

Season 56 of Horizon premiered on January 23, 2019.

Season 57 of Horizon premiered on January 16, 2020.

Season 58 of Horizon premiered on January 4, 2021.

Season 59 of Horizon premiered on March 31, 2022.