555 - Isles of Scilly
Always double-check with the organizer's website! This page may contain affiliate links.
555 - 5 Days, 5 Islands Running Challenge
555 is a multi-day event across the Isles of Scilly that stages running and walking loops on five islands over five days. The main formats are a full five-day series or single-day entries, with each distance run on clearly marked island loops.
Distances offered:
- 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 course details list loop lengths by island: St Martin’s (10 km per loop), Tresco (10 km per loop), St Agnes (9 km per loop), Bryher (8 km per loop), and St Mary’s (17 km per loop). The published itinerary covers registration on 3 October and island stages from 4 to 8 October 2026.
Time limits are set for each distance. Marathon participants have a finish limit equivalent to about 9:15 min/km. Half marathon and single loop entrants have minimum finishing windows and walking pace guidelines appropriate for slower participants and families.
Each island provides an indoor event hub with toilets, hot and cold water, and shelter. Participants may leave a kit bag with personal food and fuel at the start point for access between loops. For convenience across the week, staying on St Mary’s is recommended. Visit the organization's website for the most recent information.
