Øyer-Tretten IF was one of 494 clubs from Norway that had teams playing during Norway Cup 2018. They participated with three teams in Boys 13 - born 2005 - 9 aside, Girls 14 - born 2004 - 11 aside and Girls 17 - born 2001 - 11 aside respectively. Two teams played until 1/8 Final in Playoff B; Girls 14 - born 2004 - 11 aside lost against Lyngbø SK by 3-4 and Girls 17 - born 2001 - 11 aside lost against Os/Nansen FGR by 0-2.

In addition to this, Øyer-Tretten IF have participated in Norway Cup before. During Norway Cup 2017, Øyer-Tretten had 5 teams playing in D - Boys 9-aside, 13 years, F - Boys 7-aside, 14 years, B - Boys 11-aside, 15/16 years, S - Girls 11-aside, 14 years and R - Girls 11-aside, 15/16 years respectively. The team in R - Girls 11-aside, 15/16 years made it to the the Semi final in Playoff B, but lost it against Lillesand IL by 0-5.

Øyer-Tretten comes from Tretten which lies approximately 160 km from Oslo, where Norway Cup takes place. The area around Tretten does also provide two additional clubs participating during Norway Cup 2018 (Lillehammer Fotballklubb and Roterud IL).