Holøs began playing for hometown Norwegian team Sparta Warriors of the GET-ligaen in 2002, but after the 2007–08 season he signed with Färjestads BK of the Swedish Elitserien.\n', '

After the 2008 IIHF World Championship in Canada, he was invited to a summer camp with the Chicago Blackhawks. But on 21 June 2008, he was drafted by the Colorado Avalanche of the National Hockey League in the sixth round as the 170th overall pick. Returning to Sweden Holøs played in 55 games and recorded 8 goals for 16 points. Färjestad\'s General Manager, Thomas Rundqvist, stated before the 2009 Playoff finals that Holøs was the player who had evolved the most in the 2008–09 season, and that the Avalanche wanted him already in the autumn of 2009. But Holøs stated that he had a two-year contract with Färjestad, which he intended to fulfill. After finishing the 2009–10 season with 14 points for Färjestads he left the Elitserien and signed with the Colorado Avalanche to a two-year entry-level contract on May 26, 2010.\n', '

In the 2010–11 season, he made the Avalanche opening night roster out training camp. Holøs made his NHL-debut on October 16, 2010, against the New York Islanders leading all players in time on ice with 23:57 in his first game. He became the sixth Norwegian, following Bjørn Skaare, Anders Myrvold, Espen Knutsen, Ole-Kristian Tollefsen and Patrick Thoresen to play in the NHL. In his fourth game he set a new individual NHL-game record amongst Norwegians by logging a total of 27 minutes and 22 seconds of time on ice. On November 21, 2010, he was sent down to the Colorado\'s AHL affiliate, the Lake Erie Monsters. On December 19 he was back with the Avalanche, registering his third assist of the season, tying the Norwegian record of most assists in one season by a defenceman.\n', '

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