Find Trail Ultra Marathon Races

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Race	Difficulty Score	Distance	Elevation	Month	Compare Races	Race Website
ARC of Attrition 100 Miles by UTMB Ultra Marathon Race in January near Cornwall	265.08	161.00km	5138metres	January	Compare this race	Sign up to this race
Country to Capital 43 Miles Ultra Marathon Race near London in January		69.00km	474metres	January	Compare this race	Sign up to race
ARC of Attrition 50 Miles by UTMB Ultra Marathon Race in January near Cornwall	181.41	80.00km	2544metres	January	Compare this race	Sign up to race
The Winter Spine Race 268 Mile Non Stop Ultra Marathon Race near Pennine Way in January	644.71	418.00km	11628metres	January	Compare this race	Sign up to race

Distance: The total length of the race in kilometers or miles.
Elevation per KM: The average vertical gain every kilometer; higher numbers mean steeper races.
Kilometer Effort: The "real-feel" distance combining flat length and vertical climbing into one effort metric.
Difficulty Score: A unique rating calculated from distance, ascent, and terrain technicality.
DNF Rate: The percentage of runners who historically do not finish the race.
Ground Type: Defines the surface, such as hard-packed trail, technical mountain rock, or bog.

Categorised Climbs: The total number of significant, sustained uphill sections on the course.
Avg/Max Altitude: The average and peak heights above sea level you will reach during the race.
Uphill/Downhill %: The percentage of the course spent climbing, descending, or running on flat ground.
Steepest Hill: The maximum gradient percentage you will encounter on the toughest climb.
Cat Biggest Climb: The length and total vertical gain of the single largest climb in the race.

Finish Cut-Off: The total time allowed to reach the finish line before being disqualified.
Pace to Finish: The minimum speed (km/h) required to beat the cut-offs, including aid station stops.
Start Time: Whether the race begins in the morning, evening, or at night.
Time of Day: Indicates if you will be running through the day, the night, or both.
Trajectory: Defines if the race is a single loop, a point-to-point, or an out-and-back route.

Checkpoints: The total number of aid stations and the average distance between them.
Support Types: Details if the race is self-supported or provides water, food, and medical aid.
Navigation Type: Whether the course is fully marked with flags or requires map-and-compass skills.
UTMB Stones: The number of qualifying stones awarded for entry into the UTMB World Series Finals.
Entry Fee per KM: The total cost of the race divided by its distance for easy price comparison.

Beauty Spot Rating: A star rating based on the scenic landmarks and views along the route.
Mountain Ranges: The specific mountain groups the race traverses (e.g., Eryri, Glyderau).
Wilderness %: The proportion of the course that takes place in wild, unmanaged natural habitats.
Avg Temp: The typical temperature expected during the month the race is held.