Early years

KooKoo started its career in the official series of the Association in the 1966–1967 season, when it participated in the Southern Finland division of Maakuntasarja. During the 1967–1968 season, KooKoo played in the Greater Savo division of Maakuntasarja, where it ranked fourth. In the 1969–1970 season, KooKoo ranked second in the Kymenlaakso division and reached the Suomensarja qualifier but wasn't promoted.

Time in the I Division

KooKoo rise to the second highest level in the series, the Suomensarja for the season 1971–1972. It was also included in the 1974 newly created series, the I Division. In 1982, an ice rink was built in Kouvola, which greatly improved the operating conditions. The first match in November 1982 between KooKoo and SaPKo ended in KooKoo's 7–4 victory in front of over 4,000 spectators. KooKoo was able to attempt qualifying to SM-liiga for the first time in the 1984–1985 season, after ranking third in the season. However, KooKoo didn't make it. During the 1985–1986 season, KooKoo was coached by Reino Ruotsalainen, and was ranked third in the regular season. In the four-team league qualifying, Kookoo also ranked third and was forced to continue in the I Division. In the 1986–1987 season, the club celebrated its first league victory after winning the division's regular season before TuTo Hockey.

Time in SM-Liiga

KooKoo's first season in the SM-Liiga was difficult. In the spring of 1988, KooKoo played a very tight five-game relegation series with Lahden Kiekkoreipas. The fourth game extended to the overtime until Lasse Tasala settled the match to KooKoo. After that, KooKoo easily retained its place in the crucial fifth match played at home.

In their second season, KooKoo played in the 1988–1989 season with Urpo Ylönen. The team reached its best results as ninth of the league.

The team's last season in the league was very weak and it was relegated back to the first division after losing to the qualifying round for Hockey Reipas.

Back to Division and Fall in Division II

KooKoo started the 1990s in the first division. KooKoo was relegated in 1997 when the first division team was downsized by four. The unambiguous aim of the club was to get back to the first division. The team survived until qualifying, but Hyvinkää Ahmat was better off with 3–2.

Back to Division and Mestis

KooKoo plays against Jukurit in 2007.

In the 1998–1999 season, KooKoo came out again in qualifying. It succeeded in winning the Uudenkaupungin Jää-Kotkat in the matches 3-2 and was promoted to the first division after the two-year absence.

In 2000, the team moved to the newly established Mestis. In the spring of 2005, the club announced that it would close down the representation team, but the team with new organization. In 2009–2010 season, KooKoo won the Mestis Regular Series for the first time in 23 years. At the end of the season KooKoo reached bronze medals by winning LeKi 4–2. In the season 2013–2014, KooKoo won Jukurit in finals.

Return to the SM-Liiga

KooKoo against Kärpät in Oulu's Raksila, 2022-23 season

In October 2014, information about KooKoo return to the SM-Liiga for the 2015-2016 season was published.

At the 2017–2018 season, KooKoo made history in the SM-Liiga by leading the series for the first time. At the time, there were 15 teams who had reached the top spot in the regular season.

KooKoo made the 2019–2020 season Kouvola's hockey history for the first time making to the league playoffs. However, the playoffs were not played during the season due to the Coronavirus pandemic. In 2020–2021 season KooKoo reached playoffs Wild-card round against Ilves. KooKoo's season ended in 9th place and Ilves advanced to the quarterfinals.

At the 2021–2022 season, KooKoo advanced for the third time to the playoffs, in Wild-card round ended up against a familiar local opponent Lahti Pelicans. KooKoo's season continued after defeating Pelicans with a total score of 2-1 after two games and KooKoo advanced to the quarterfinals against old Mestis rival Jukurit.

Current roster

Updated February 2020.^[1]

No.	Nat	Player	Pos	S/G	Age	Acquired	Birthplace
40		Martin Berger	D	L	27		Turku
47		Alexander Bonsaksen	D	L	36		Oslo
8		Matthew Caito	D	R	30		Coto de Caza
26		Jere Friberg	F	L	28		Laitila
55		Vilmos Galló	F	L	27		Budapest
72		Juha-Pekka Haataja	F	R	41		Oulu
94		Anrei Hakulinen	F	L	33		Turku
53		Niilo Halonen	G	L	25		Loppi
30		Henrik Haukeland	G	L	29		Fredrikstad
16		Markus Jokinen	F	L	35		Kuorevesi
85		Toni Kähkönen	F	L	37		Vaasa
19		Erik Karlsson	F	L	29		Lerum
62		Kimi Koivisto	F	L	31		Heinola
25		Roope Laavainen	D	R	25		Helsinki
41		Oskari Manninen	D	L	32		Vantaa
9		Trevor Mingoia	F	R	31		Fairport
18		Joonas Oden	F	R	23		Benton City
27		Kasperi Ojantakanen	F	R	29		Helsinki
3		Arttu Pelli	D	R	27		Kouvola
88		Kyle Platzer	F	R	28		Waterloo
21		Patrik Puistola	F	L	23		Tampere
7		Juho Rautanen	D	L	26		Mäntsälä
6		Peetro Seppälä	D	L	23		Kuusankoski
12		Kim Strömberg	F	L	36		Helsinki
73		Libor Šulák	D	L	29		Pelhrimov
14		Toni Suuronen	F	L	28		Hamina

Captains^[2]

Champions

• Mestis (1): 2013-14
• I-Divisioona (1): 1986-87
• Maakuntasarja (II-Divisioona) (1): 1972

Runners-up

• Mestis (3): 2001-02, 2012-13, 2014-15
• I-Divisioona (Fazer-liiga) (1): 1994–95
• Mestis (3): 2002-03, 2009-10, 2011-12
• I-Divisioona (5): 1982–83, 1984–85, 1985–86, 1991–92, 1992–93

Other awards for the club:

• Imatra Bauer Tournament winner (1): 2016
• Vaasa Cup winner (1): 2013
• Tampere Cup winner (1): 2021

Ranking in the SM-Liiga

• 1987–88 – 10.
• 1988–89 – 9.
• 1989–90 – 11.
• 2015–16 – 11.
• 2016-17 – 13.
• 2017–18 – 14.
• 2018–19 - 13.
• 2019–20 - 5.
• 2020–21 - 9.
• 2021–22 - 4.
• 2022–23 - 8.

NHL alumni

• Mika Alatalo
• Hannu Kamppuri
• Marko Kiprusoff
• Jarno Kultanen
• Anssi Melametsä
• Jarmo Myllys
• Joni Ortio
• Petri Varis
• Brett Carson
• Josh Green
• Leland Irving
• Christian Thomas
• Gary Yaremchuk
• Jim Leavins
• Steve Peters
• Matt Watkins
• Tommy Wingels
• Niklas Treutle
• Libor Šulák

Other former notable players

• / Viktor Tyumenev
• / Siim Liivik
• / Frederic Cloutier
• Reino Soijärvi
• Alexander Bonsaksen
• Malte Strömwall
• Timo Susi
• Ari Vallin
• Juha-Pekka Haataja