The relay half marathon as part of the ZAGREB21 race provides a unique opportunity for team participation and competition over a half marathon distance divided into four sections.

Basic information:

• Total length: 21.1 km (classic half marathon course).
• Number of team members: 4 people.
• Individual leg length: Each team member runs 5.275 km.
• Date: Sunday, March 22, 2026.
• Start time: 8:30 a.m. (together with the main half marathon).
• Start and finish location: In front of the National and University Library in Zagreb.

The relay is divided into 4 legs. Each competitor runs one leg. A competitor starts his/her section when a competitor from his/her team who ran the previous section runs up to him/her and touches him/her with his/her hand in the designated area. Competitors running the first section start together with the other half marathon competitors. For competitors in other relay relays, escort to the relay location is provided.

All other rules and responsibilities apply as for the half marathon race, with the exception that relay races are open to competitors who are 10 years of age or older on the day of the race. Competitors 12 years of age and younger must be certified by a parent and a sports medicine physician.
The sections are divided as follows – the first three runners run 5km, and the last, fourth runner runs a 6.1km section.