In addition to the two Önnereds teams, 108 other teams from 14 different countries played in Girls 13. They were divided into 18 different groups, whereof Önnereds HK 1 could be found in Group 1 together with Baekkelaget SK, HSG Jörl-DE Viöl, Kävlinge HK, Eidsvold Turn 1 and Dybbøl IU 3. Önnereds HK 1 continued to A-Play-off after reaching 1:st place in Group 1. In the playoff they made it to 1/32 Final, but lost it against Haslum IL 2 with 10-11. In the Final, Rödovre HK won over Handbalschool Brabant and became the winner of A-Play-off in Girls 13. Önnereds HK also participated in Girls 12 during Partille Cup 2018. They reached the 1/16 Final in G12 A-Play-off, but lost it against Alingsås HK 2 with 9-15.