Participants Register for Grefsenkollen Opp 2026 4.7 km Today 370 participantsMin age: 11 years 400 kr1/11/2026 11:00 PM → 5/10/2026 9:59 PM450 kr5/10/2026 10:00 PM → 5/19/2026 9:59 PM550 kr5/19/2026 10:00 PM → 5/20/2026 9:59 PMRegister20+ yearsRegister childRegister friend
