555 - Isles of Scilly
Hugh Town, United Kingdom • 4-8 Oct 2026
555 – Five Islands in Five Days, Isles of Scilly
The 555 is a multi day running event on the Isles of Scilly taking place 4 to 8 October 2026. Over five consecutive days the event stages loops on five different islands with boat transfers between islands. Participants can enter the full series or take part on individual days.
There are three distance formats that use clearly marked island loops:
- 5 Marathons total 211 km / 131 miles
- 5 Half Marathons total 106 km / 76 miles
- 5 Island Loops approx total 55 km / 35 miles
Daily time limits are set for each format. Marathons have a 6 hour 30 minute limit (equivalent to 9:15 min/km or 14:45 min/mile). Half marathons and single loops require at least 5 hours 30 minutes to finish; half marathons are paced at 15 min/km or 25 min/mile, and loopers at about 2.5 km/hr or 1.5 mph.
Each island provides a dry indoor event hub with toilets, hot and cold water, and shelter. Participants may leave a kit bag at the start point to access between loops. For convenience during the week, staying on St Marys is recommended.
Itinerary overview: registration on 3 October; St Martin’s, Tresco, St Agnes, Bryher, and St Mary’s for loops on 4–8 October respectively. Visit the organization's website for the most recent information.