Season 1 of Through the Keyhole premiered on April 3, 1987.

Season 2 of Through the Keyhole premiered on April 15, 1988.

Season 3 of Through the Keyhole premiered on February 17, 1989.

Season 4 of Through the Keyhole premiered on March 9, 1990.

Season 5 of Through the Keyhole premiered on April 5, 1991.

Season 6 of Through the Keyhole premiered on May 8, 1992.

Season 7 of Through the Keyhole premiered on May 14, 1993.

Season 8 of Through the Keyhole premiered on April 10, 1994.

Season 9 of Through the Keyhole premiered on February 22, 1996.

Season 10 of Through the Keyhole premiered on April 7, 1997.

Season 14 of Through the Keyhole premiered on May 14, 2001.

Season 16 of Through the Keyhole premiered on March 3, 2003.

Season 18 of Through the Keyhole premiered on February 27, 2006.

Season 19 of Through the Keyhole premiered on March 26, 2007.

Season 20 of Through the Keyhole premiered on May 6, 2008.