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The Isles Ultramarathon
Next edition: Thursday, 16 September 2027 – Thursday, 23 September 2027Vatersay to the Butt of Lewis, Scotland
A six-stage, 300K northbound traverse of the Outer Hebrides from Vatersay to the Butt of Lewis, following the Hebridean Way through coastal, moorland and island terrain.
Official race site (opens in a new tab)
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Distance186.4 mi
Ascent4,600m*
Climb / km15.3m
CutoffUnknown
Cutoff paceUnknown
Technicality6/10
Entry£2850
FormatPoint-to-point
Next edition
16 September 2027 – 23 September 2027
This is the most relevant confirmed edition currently held for the permanent race family. Edition-specific facts should still be checked against the final organiser instructions.
Edition archive
Expand an edition to inspect its year-specific facts. Other years never replace the primary edition facts.
Other announced editions
2028 to Registration open
These facts belong to the 2028 edition only. Missing values have not been copied from another year.
- Distance
- 300 km
- Ascent
- 4,600m approx.
- Cutoff
- Not verified
- Entry
- £2,850
- Format
- multi stage · point to point
- Stage layout
- 6 stages · longest 59 km
Successful source check: 1 Sept 2026Source confidence: highThe official current page verifies the 14–21 September 2028 dates, 300K headline distance, six-stage itinerary and £2,850 price. Its published stage distances total 296K and stage ascent totals approximately 4,600m. Navigation and daily cutoffs remain unpublished for this edition.
Check The Isles Ultramarathon 2028 source (opens in a new tab)
Past editions
2026 to Past edition
These facts belong to the 2026 edition only. Missing values have not been copied from another year.
- Distance
- 300 km
- Ascent
- 4,600m approx.
- Cutoff
- Not verified
- Entry
- £2,750
- Format
- multi stage · point to point
- Stage layout
- 6 stages · longest 59 km
Successful source check: 4 Sept 2026Source confidence: highThe official 2026 guide and event page verify the 17–24 September dates, sold-out status, 300K headline distance, six stages, GPX-led self-navigation and £2,750 price. Published stage distances total 296K and stage ascent totals approximately 4,600m; no single overall cutoff is stored because the organiser uses daylight and ferry-dependent daily controls.
Check The Isles Ultramarathon 2026 source (opens in a new tab)
Plan your next race
Compare the route, time limit and entry requirements with other options. The first-ultra guide helps assess readiness; it does not imply this race is suitable for beginners.
Race For You difficulty
6.7/ 10
Hard
Moderate input evidence · 55% evidence coverage
The main recorded demands are substantial race distance, accumulated fatigue and format burden, technical terrain. Course difficulty and cutoff pressure describe different challenges: more approachable terrain can still require a demanding pace to beat the deadline. Neither score assesses your personal fitness, safety or readiness.
Scoring details and version
Difficulty V2's separate time-limit modifier adds 0.00 points here and is capped at 0.70; a broad limit cannot erase extreme intrinsic demand. This is independent of the public Cutoff Pressure V2 band. Evidence coverage describes the recorded inputs, not prediction accuracy or your likelihood of finishing.
Weather, conditions and individual preparation can change the real difficulty significantly.
How the score works Distance, weighted 30 percent8.7 out of 10
Climbing, weighted 25 percent5.2 out of 10
Technicality, weighted 15 percent6 out of 10
Accumulated burden, weighted 17 percent7.2 out of 10
Exposure & support, weighted 13 percent5.5 out of 10
Course analysis
What shapes this race
Expect sections where foot placement and downhill confidence matter, exposed moorland where weather can amplify the difficulty.
trailcoastalmoorlandroadmixedtechnical
Climbing density
15.3m per km
A more useful comparison than total ascent alone: it shows how consistently the course asks you to climb.
Cutoff analysis
Unknown
The official overall cutoff has not yet been verified. Race For You will not estimate one.
Who this suits
First ultra?
This is not designed as a first-ultra recommendation. Significant endurance, navigation or mountain-race experience is strongly advised.
2.5/10 suitability
Exposure & kit
extensive kit
Night-running exposure has not been verified for this edition. Check the organiser’s latest schedule, route information and final kit rules.
Personal race predictor
Will you make the cutoff?
Use a previous result to estimate a realistic range for The Isles Ultramarathon, your potential buffer and the biggest change in demand.
Practical detail
Support & logistics
Support levelfully supported
LogisticsPublic transport possible
LogisticsAccommodation nearby
LogisticsBag drop
Logistics are only shown where currently recorded. Confirm parking, transport, crew access and final aid-station plans with the organiser.
Latest verification
Trust the source, see the gaps.
Data PartialThe official current page verifies the 16–23 September 2027 dates, 300K headline distance, six-stage itinerary and £2,850 price. Its published stage distances total 296K and stage ascent totals approximately 4,600m. The future navigation method and daily cutoffs are not yet published and have not been carried forward from 2026.
- Successful source check
- 1 Sept 2026
- Catalogue record updated
- 1 Sept 2026
- Official source
- Available
Still unverified: cutoff.
Elevation is approximate or awaiting final confirmation.
Event details can change after a successful source check. Confirm the final route, kit, cutoff, price and entry terms directly with the organiser before entering or travelling.
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