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Trail running calendar 2027: races ranked by effort

744 trails and ultra-trails 2027 across 31 countries, sorted into seven km-effort categories. For each race: date, elevation gain/km, cut-off time and minimum speed required (679 cut-off times recorded).

Enter your city: each category will show the straight-line distance to the start of each race.

The seven 2027 categories

Number of 2027 races by km-effort category.
CategoryKm-effortRaces
Short XXS trails 2027: less than 25 km-effortless than 25 km-effort95
XS trails 2027: 25 to 44 km-effort25 to 44 km-effort158
S trails 2027: 45 to 74 km-effort45 to 74 km-effort163
M trails 2027: 75 to 114 km-effort75 to 114 km-effort125
L ultra-trails 2027: 115 to 154 km-effort115 to 154 km-effort87
XL ultra-trails 2027: 155 to 209 km-effort155 to 209 km-effort56
XXL ultra-trails 2027: 210 km-effort and above210 km-effort and above60

Widest cut-off times in 2027

The widest cut-off requires a minimum speed of 1.0 km/h: mozart 100 - mozart Lake Trail.

  1. mozart 100 - mozart Lake Trail : 1.0 km/h (12 km in 12 h)
  2. Transpyrenea - 100% Basque - Transpy 100K : 1.1 km/h (103 km in 96 h)
  3. Transpyrenea - Défi Basque - Transpy 200K : 1.4 km/h (200 km in 144 h)
  4. Transpyrenea - Défi Catalan - Transpy 181 Km : 1.5 km/h (176 km in 120 h)
  5. Transpyrenea - 400K : 1.6 km/h (373 km in 240 h)

Most rolling races in 2027

The most rolling climbs only 2 m per km: C&O Canal 100.

  1. C&O Canal 100 : 2 m/km (292 m elevation gain over 161 km)
  2. Dam Yeti 50 : 3 m/km (216 m elevation gain over 82 km)
  3. Yeti Washington 100 Mile : 4 m/km (599 m elevation gain over 163 km)
  4. Yeti Washington 100k : 5 m/km (516 m elevation gain over 100 km)
  5. Yeti Washington 50 Mile : 6 m/km (484 m elevation gain over 80 km)

Steepest races in 2027

The steepest climbs 182 m per km: Swiss Alps Vertical.

  1. Swiss Alps Vertical : 182 m/km (1,821 m elevation gain over 10 km)
  2. Skyrace Lodrino - Lavertezzo : 119 m/km (2,706 m elevation gain over 23 km)
  3. Stoos-Trail - BAERGLAUF : 118 m/km (1,585 m elevation gain over 13 km)
  4. Morobbia Trail - Trail della Croce K14 : 95 m/km (1,394 m elevation gain over 15 km)
  5. Scenic 500 K30 : 89 m/km (2,885 m elevation gain over 32 km)

Most accessible 100-milers in 2027

The most accessible 100-miler runs at 1.4 km/h minimum average pace: Transpyrenea - Défi Basque - Transpy 200K.

  1. Transpyrenea - Défi Basque - Transpy 200K : 1.4 km/h (200 km in 144 h)
  2. Transpyrenea - Défi Catalan - Transpy 181 Km : 1.5 km/h (176 km in 120 h)
  3. Transpyrenea - 400K : 1.6 km/h (373 km in 240 h)
  4. Transpyrenea - 450K : 1.7 km/h (416 km in 240 h)
  5. Transpyrenea - 900K : 1.9 km/h (760 km in 400 h)

Ranking glossary

Effort-km
Distance in km plus elevation gain divided by 100: 50 km and 2,500 m of gain equals 75 effort-km. Categories: XXS under 25, XS 25 to 44, S 45 to 74, M 75 to 114, L 115 to 154, XL 155 to 209, XXL 210 and above.
Gain/km
Elevation gain divided by distance, in meters per kilometer: the lower it is, the more runnable the race.
Time limit
The maximum time allowed by the organizer to reach the finish, the final cut-off time.
Minimum speed
Distance divided by time limit, in km/h: the average pace to maintain to finish within the deadline. The lower it is, the wider the cut-off.

FAQ

How many 2027 trails are ranked here?

744 races in 2027 in 31 countries. The most populated category is S (45 to 74 km-effort), with 163 races.

What is effort-km?

The distance in km plus elevation gain divided by 100. A 50 km trail with 2,500 m elevation gain is 75 effort-km: it falls into the M category.

Which 2027 trail has the widest cut-off time?

mozart 100 - mozart Lake Trail: 12 km in 12 h, i.e. 1.0 km/h minimum speed, the lowest of the 679 races with a published time limit.

Which 2027 100-miler is the most accessible?

Transpyrenea - Défi Basque - Transpy 200K: 200 km in 144 h, i.e. 1.4 km/h minimum average pace.

Which 2027 trail is the most rolling?

C&O Canal 100: 2 m elevation gain per km (292 m over 161 km).

How many 2027 races publish a time limit?

679 out of 744. The others show « unknown » and appear at the end of the minimum speed sort.

Method and sources

Data updated October 31, 2026, covering 744 2027 races in the RAVIT catalog.

  • Distance, gain, date, country and time limit: sourced from each race organizer's website, and utmb.world for UTMB World Series events; each entry cites its source.
  • Categories XXS to XXL: calculated by RAVIT using effort-km (km + gain/100), at the thresholds shown above.
  • Minimum speed: distance divided by time limit. A race with no published time limit displays « unknown » and sorts to the end.
  • Aid stations: the number of documented aid stations on the race's RAVIT entry; « unknown » when none are yet documented.

Example estimated time: La Sportiva Lavaredo Ultra Trail - Lavaredo 120K, at 600 Index, 20 h 19 (October 31, 2026 calculation), the time a fresh RAVIT plan would give. Your time at your Index: create an account.

The Running Stones 2027, race by race · The 2027 cut-off time gauge · Build my 2027 season

To browse the same races month by month:the 2026-2027 trail calendar.