Part of Ostrov - 3 - jižní část, Čtyřhran has 10 routes documented on climbing.place. Routes range from grade 2+ to 8/8+. Routes are listed below with grade, style, and community notes.
Common styles: Rock Climbing, Fixed belay.
Nature Conservation: Climbing allowed all year round. Nature Conservation Document: Decision 2020, maps authority OP CHKO Kokořínsko1b
OVK: Use magnesium according to sandstone rules, first ascents only with the consent of the administrator.