Bieg Twierdzy Kraków is a cross-country race series in Kraków centered on the old Kraków Fortress. Editions utilize green, legally protected historic areas within the city, with routes connected to former military sites instead of standard park circuits. Runners typically select either 5 km or 10 km, primarily on forest paths and dirt roads, and at least some routes feature a steep ascent. The event, organized by Stowarzyszenie Adventure, consists of a single-morning race followed by an awards ceremony and a guided walk.
The course locations may encompass areas like Park Reduta and the vicinity of Fort Kościuszko, with the broader fortress terrain incorporating forts, ramparts, caverns, field batteries, and shelters. Following each race, participants and their guests are invited to a complimentary guided tour, frequently guided by the Rawelin Association, with some walks also showcasing reconstruction efforts. Category victors are awarded handmade cups crafted from century-old bricks, featuring a unique design for each edition, while all finishers receive a commemorative medal. The series also dedicates significant attention to race photography, ensuring participants depart with more than just their finishing time.