Season 0 of Countdown premiered on null.

Season 1 of Countdown premiered on 1982-11-02.

Season 2 of Countdown premiered on 1983-07-01.

Season 3 of Countdown premiered on 1983-12-14.

Season 4 of Countdown premiered on 1982-06-27.

Season 5 of Countdown premiered on 1984-10-15.

Season 6 of Countdown premiered on 1985-01-07.

Season 7 of Countdown premiered on 1985-10-14.

Season 8 of Countdown premiered on 1986-01-06.

Season 9 of Countdown premiered on 1986-03-31.

Season 10 of Countdown premiered on 1986-10-13.

Season 11 of Countdown premiered on 1987-02-02.

Season 12 of Countdown premiered on 1987-04-13.

Season 13 of Countdown premiered on 1987-06-22.

Season 14 of Countdown premiered on 1987-10-05.

Season 15 of Countdown premiered on 1988-04-11.

Season 16 of Countdown premiered on 1988-06-20.

Season 17 of Countdown premiered on 1989-01-02.

Season 18 of Countdown premiered on 1989-07-10.

Season 19 of Countdown premiered on 1990-01-01.

Season 20 of Countdown premiered on 1990-07-02.

Season 21 of Countdown premiered on 1990-12-31.

Season 22 of Countdown premiered on 1991-07-01.

Season 23 of Countdown premiered on 1991-12-30.

Season 24 of Countdown premiered on 1992-06-29.

Season 25 of Countdown premiered on 1993-01-04.

Season 26 of Countdown premiered on 1993-07-05.

Season 27 of Countdown premiered on 1994-01-03.

Season 28 of Countdown premiered on 1994-07-04.

Season 29 of Countdown premiered on 1995-01-02.

Season 30 of Countdown premiered on 1995-07-03.

Season 31 of Countdown premiered on 1996-01-01.

Season 32 of Countdown premiered on 1996-07-01.

Season 33 of Countdown premiered on 1996-12-19.

Season 34 of Countdown premiered on 1996-12-30.

Season 35 of Countdown premiered on 1997-05-22.

Season 36 of Countdown premiered on 1997-06-30.

Season 37 of Countdown premiered on 1997-09-29.

Season 38 of Countdown premiered on 1997-12-29.

Season 39 of Countdown premiered on 1998-06-29.

Season 40 of Countdown premiered on 1998-12-28.

Season 41 of Countdown premiered on 1999-06-28.

Season 42 of Countdown premiered on 1999-12-27.

Season 43 of Countdown premiered on 2000-06-26.

Season 44 of Countdown premiered on 2001-04-26.

Season 45 of Countdown premiered on 2001-07-02.

Season 46 of Countdown premiered on 2001-09-24.

Season 47 of Countdown premiered on 2001-12-26.

Season 48 of Countdown premiered on 2002-07-01.

Season 49 of Countdown premiered on 2003-01-06.

Season 50 of Countdown premiered on 2003-06-30.

Season 51 of Countdown premiered on 2004-04-11.

Season 52 of Countdown premiered on 2004-06-28.

Season 53 of Countdown premiered on 2005-01-04.

Season 54 of Countdown premiered on 2005-10-31.

Season 55 of Countdown premiered on 2006-05-29.

Season 56 of Countdown premiered on 2007-01-02.

Season 57 of Countdown premiered on 2007-06-25.

Season 58 of Countdown premiered on 2008-01-02.

Season 59 of Countdown premiered on 2008-06-23.

Season 60 of Countdown premiered on 2009-01-12.

Season 61 of Countdown premiered on 2009-06-22.

Season 62 of Countdown premiered on 2010-01-11.

Season 63 of Countdown premiered on 2010-06-21.

Season 64 of Countdown premiered on 2011-01-10.

Season 65 of Countdown premiered on 2011-06-06.

Season 66 of Countdown premiered on 2012-01-09.

Season 67 of Countdown premiered on 2012-07-02.

Season 68 of Countdown premiered on 2013-03-04.

Season 69 of Countdown premiered on 2013-07-01.

Season 70 of Countdown premiered on 2014-01-06.

Season 71 of Countdown premiered on 2014-06-30.

Season 72 of Countdown premiered on 2015-01-05.

Season 73 of Countdown premiered on 2015-06-15.

Season 74 of Countdown premiered on 2016-01-25.

Season 75 of Countdown premiered on 2016-06-27.

Season 76 of Countdown premiered on 2017-01-03.

Season 77 of Countdown premiered on 2017-07-03.

Season 78 of Countdown premiered on 2018-01-02.

Season 79 of Countdown premiered on 2018-06-25.

Season 80 of Countdown premiered on 2019-01-23.

Season 81 of Countdown premiered on 2019-07-01.

Season 82 of Countdown premiered on 2020-01-02.

Season 83 of Countdown premiered on 2021-01-04.

Anne Robinson presents the long-running game, Rachel Riley is in charge of the letters and numbers while Susie Dent is in the Dictionary Corner.

Season 85 of Countdown premiered on 2022-01-03.

Season 86 of Countdown premiered on 2022-06-20.

Colin Murray and Rachel Riley host as contestants race against the clock to pit their wits against vowels, consonants and numbers. They are joined by Susie Dent in Dictionary Corner. Each day two contestants compete in 15 rounds of words and numbers to become the Countdown Champion.

Season 88 of Countdown premiered on 2023-06-30.

Season 89 of Countdown premiered on 2024-01-02.

Season 90 of Countdown premiered on 2024-07-01.

Season 91 of Countdown premiered on 2025-01-06.

Colin Murray, Rachel Riley and Susie Dent return once again with a variety of guests in Dictionary Corner, as contestants race against the clock to pit their wits against vowels, consonants and numbers.