Participants will be sorted into four start groups according to their estimated finish time. The fastest runners start first. Participants will be given a coloured race number that indicates his/her starting group.

Runners are requested to make their way to their correct start group in good time before the start of the race. Under no circumstances may a runner start with a different start group from that indicated by his or her race number. Runners who arrive at the start line too late for their start group must notify the start director immediately.

There are four start groups: yellow, red, green and blue. At the start of the trail there is a narrow uphill path, therefore there are five minutes between starts, this is done to ensure that there will be no time elapses before runners cross the start line. Participants are then started with a 5 second delay, one at a time within each colour group. By doing this, we hope to improve the accuracy of finish times and to reduce congestion on the trail and keep distance for health reasons. This can also mean that the first one to the finish line is not necessarily the winner, but shortly after we will have the accurate results.

Attached to the race number are two tickets with each runners special race number on and is meant as a tag for luggage. For further information go to the luggage page.

At the very bottom of the race number is an elevation map for the route that is meant to be attached to the race number and looked at by looking down at it when the race number is attached to the front of you.

Participants will be assigned to different start groups based on how fast they intend to run and their running history. For the best possible outcome, we ask participants to tell us their best marathon and Laugavegur Ultra Marathon results when they register for the race. They can also send us further information about their running history to [email protected]. Few weeks before the race runners are asked to register their estimated finish time. This registration takes place on "Your page" and is open until July 1st. In the same registration, they can also request to be assigned to the same start group as one or more of their running partners. The organisers will do their best to accommodate the wishes of all participants. In order to group two or more runners together, a request to be assigned to the same group must be received from both/all of these participants.