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Rat Race 100: Glamis Castle to Stirling Castle
Rat Race 100 Series
Next edition: Saturday, 28 August 2027 – Monday, 30 August 2027Glamis Castle to Stirling Castle, Scotland
The more remote final leg of the Rat Race 100 castle trilogy, travelling 100 miles from Glamis to Stirling while skirting the Cairngorms and surrounding hills.
Official race site (opens in a new tab)
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Distance99.4 mi
AscentUnknown
Climb / kmUnknown
Cutoff48h
Cutoff pace18:00/km
Technicality5/10
Entry£339
FormatPoint-to-point
Next edition
28 August 2027 – 30 August 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
This is the only edition currently stored for this race family. Earlier verified editions can be added without changing the permanent race URL.
Check the official race source (opens in a new tab)Race For You difficulty
6.7/ 10
Hard
Moderate evidence confidence · 69% evidence coverage
This score is driven most by substantial race distance. 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.
Weather, conditions and individual preparation can change the real difficulty significantly.
How the score works Distance, weighted 30 percent6.8 out of 10
Climbing, weighted 25 percent5.5 out of 10
Technicality, weighted 15 percent5 out of 10
Accumulated burden, weighted 17 percent5.6 out of 10
Exposure & support, weighted 13 percent5.5 out of 10
Course analysis
What shapes this race
Expect sustained upland ground and meaningful climbing, exposed moorland where weather can amplify the difficulty.
trailmountainmoorlandmixed
Cutoff analysis
Lower pressure
To finish inside 48h, the raw average required is 18:00 per kilometre (28:58 per mile), including every stop.
Raw pace18:00/km
PressureLower pressure
Cutoff pressure compares the published time limit with distance, ascent and verified course demands. Lower pressure does not mean the race is easy. Raw pace includes checkpoints, food stops, navigation errors and any sleep; it is not a pacing plan.
Because ascent is not verified, Cutoff Pressure V2 uses the model's neutral 20m/km reference density. This assumption does not fill the ascent value or make missing evidence look easy.
Who this suits
First ultra?
Better suited to runners with prior ultra, mountain or technical-terrain experience than to somebody choosing their first ultra.
4.5/10 suitability
Navigation
fully marked
The route is described as marked, but runners should still read the final race instructions.
Exposure & kit
extensive kit
Significant overnight running is likely for many entrants. Lighting, temperature management and sleep strategy can materially affect the outcome.
Personal race predictor
Prediction unavailable
No current compatible predictor target is available for this family. The selected edition may be complete or cancelled, awaiting a successor, non-standard, or missing model-critical course evidence; older facts are not substituted.
Practical detail
Support & logistics
Support levelfully supported
LogisticsParking noted
LogisticsPublic transport possible
LogisticsAccommodation nearby
LogisticsBag drop
LogisticsCrew access
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 event page verifies the 28–30 August 2027 dates, 160K distance, 48-hour window, full waymarking/support and £339 price. The route and pit-stop plan are not yet published, and the organiser's relative climbing statement is not converted into a guessed elevation total.
- Successful source check
- 1 Sept 2026
- Catalogue record updated
- 1 Sept 2026
- Official source
- Available
Still unverified: elevation.
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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