In addition to FBC Kladno, 51 other teams from 5 different countries played in Boys 15. They were divided into 13 different groups, whereof FBC Kladno could be found in Group 13 together with Hästhagen IF, Tunet IBK 1 and Röke IBK. FBC Kladno continued to Playoff A after reaching 1:st place in Group 13. In the playoff they made it to 1/8 Final, but lost it against FBC JIP Český Krumlov with 2-3. In the Final, Helsingborg, F.C. won over IBF Göteborg and became the winner of Playoff A in Boys 15. FBC Kladno also participated in Boys 14 during Gothia Innebandy Cup 2013. They reached the 1/16 Final in B14 Playoff B, but lost it against Pixbo Wallenstam IBF with 3-5.