Browse our Marathon Calendar for races organized around the world during the month of May bearing the tag Trail among 53 races.
Coastal Trail Series - Flete - Marathon
Keufelskopf Marathon Trail
Soaring Eagle Marathon Trail Run
Trail Alta Val Nure - 42 km
Weald Challenge Trail Marathon
Flint Hills Trail Marathon
The Welsh Trail Marathon Series - Round 2 - The Brecon Beacons Trail Summer