In addition to Ranheim IL, 29 other teams from 4 different countries played in Girls 18/19 - born 1999 - 11aside. They were divided into 7 different groups, whereof Ranheim IL could be found in Group 5 together with Sandviken, IL, Skjold IL - fotball Skjold/Stegaberg and Hødd, IL - Fotball.

Ranheim IL continued to Playoff B after reaching 4:th place in Group 5. In the playoff they made it to Semi final, but lost it against Oppsal IF Fotball with 1-2. In the Final, Sandviken, IL won over Oppsal IF Fotball and became the winner of Playoff B in Girls 18/19 - born 1999 - 11aside.