TDL 75K Aid Station Planner
All 7 TDL 75K checkpoints pre-loaded. Enter your goal finish time to get estimated arrival times at every aid station.
Full Val d'Aran by UTMB - TDL 75K course data: aid stations, cutoffs, course profile
Enter a goal TDL 75K finish time and get estimated arrival times at every checkpoint - 75 km with around 5,100 m of climbing, with crew and drop-bag points flagged.
Turns every arrival into a clock time and every cutoff into a margin.
Terrain changes how the goal time is shared between segments, not the total. One surface everywhere cancels out.
Checkpoints (7)
| Checkpoint | Dist (km) | D+ (m) | Km-effort | Arrive by | Clock | Cutoff | Buffer | Leave by | Seg time | Seg pace/km |
|---|---|---|---|---|---|---|---|---|---|---|
| Start | 0 | 0 | - | 0:00:00 | Wed 07:30 | - | - | - | - | - |
| Portilhonlikely hiking (pace) | 6.7 | +706 | 14.6 | 1:23:23 | Wed 08:53 | Wed 09:30 | 37 min | Wed 10:14Set by Artiga de Lin | 1:23:23 | 12:30 |
| Poilanerlikely hiking (pace) | 16.5 | +1141 | 24.2 | 3:42:15 | Wed 11:12 | - | - | Wed 12:33Set by Artiga de Lin | 2:18:52 | 14:08 |
| Artiga de Linlikely hiking (pace) | 25.0 | +508 | 20.3 | 5:38:51 | Wed 13:08 | Wed 14:30 | 1h21 | Wed 15:15Set by Bassa d'Oles | 1:56:36 | 13:45 |
| Bassa d'Oles | 39.5 | +791 | 26.9 | 8:12:54 | Wed 15:42 | Wed 17:50 | 2h07 | Wed 20:07Set by Santet Escunhau | 2:34:03 | 10:36 |
| Santet Escunhaulikely hiking (pace) | 65.5 | +1885 | 56.2 | 13:34:57 | Wed 21:04 | Thu 01:30 | 4h25 | Thu 01:57Set by Vielha (Finish) | 5:22:02 | 12:24 |
| Vielha (Finish) | 75.0 | +69 | 16.1 | 15:07:00 | Wed 22:37 | Thu 03:30 | 4h53 | - | 1:32:03 | 9:41 |
Portilhonlikely hiking (pace)
Wed 08:53Cutoff Wed 09:3037 minTight
Leave by Wed 10:14Set by Artiga de Lin
- Dist (km)
- 6.7
- D+ (m)
- +706
- Seg time
- 1:23:23
- Seg pace/km
- 12:30
Poilanerlikely hiking (pace)
Wed 11:12Leave by Wed 12:33Set by Artiga de Lin
- Dist (km)
- 16.5
- D+ (m)
- +1141
- Seg time
- 2:18:52
- Seg pace/km
- 14:08
Artiga de Linlikely hiking (pace)
Wed 13:08Cutoff Wed 14:301h21
Leave by Wed 15:15Set by Bassa d'Oles
- Dist (km)
- 25.0
- D+ (m)
- +508
- Seg time
- 1:56:36
- Seg pace/km
- 13:45
Bassa d'Oles
Wed 15:42Cutoff Wed 17:502h07
Leave by Wed 20:07Set by Santet Escunhau
- Dist (km)
- 39.5
- D+ (m)
- +791
- Seg time
- 2:34:03
- Seg pace/km
- 10:36
Santet Escunhaulikely hiking (pace)
Wed 21:04Cutoff Thu 01:304h25
Leave by Thu 01:57Set by Vielha (Finish)
- Dist (km)
- 65.5
- D+ (m)
- +1885
- Seg time
- 5:22:02
- Seg pace/km
- 12:24
Vielha (Finish)
Wed 22:37Cutoff Thu 03:304h53
- Dist (km)
- 75.0
- D+ (m)
- +69
- Seg time
- 1:32:03
- Seg pace/km
- 9:41
Highlighted rows use a pace heuristic (>12 min/km / >19 min/mi) - likely hiking by speed, not grade. The grade-based power-hike cue is ≥15% (see GAP and Incline tools). Times are distributed proportionally by km-effort.
Leave by is the latest you can start the next segment and still make every cutoff ahead of you at this pace - often set by a station further on, not this one. It does not yet subtract the time you spend stopped, so treat it as the optimistic edge.
Cutoff buffers are estimates from your goal time and published barriers. Courses and barriers change - verify against the official race guide.
Next step
About Val d'Aran by UTMB - TDL 75K
Val d'Aran by UTMB - TDL 75K covers 75 km with around 5,100 m of elevation gain, starting in Bossòst, Spain. The overall cutoff is 20 hours.
Checkpoint data approximate - verify against the current official race guide at valdaran.utmb.world before your race.
The science behind km-effort pacing
Most runners build race pacing plans by dividing total distance evenly - which ignores the fact that an uphill kilometre takes far longer than a flat one. This planner uses TrailMath's enhanced km-effort model to distribute your goal time proportionally by effort, not by distance.
The km-effort formula for each segment is: distance_km + gain_m/100 + loss_m/150. This is TrailMath's extension of the standard ITRA gain-only formula, which adds descent cost based on Minetti's finding that steep technical descents carry real metabolic load. A 5km segment with 500m of gain and 200m of loss has an effort of 5 + 5 + 1.3 = 11.3 km-effort - equivalent to running 11.3km flat. Time is allocated proportionally to this effort score.
Why gain and loss have asymmetric costs. Minetti et al. (2002) mapped the metabolic cost of inclined locomotion across gradients from -45% to +45%. The key findings: metabolic cost rises steeply above 15-20% uphill grade, making power hiking more energy-efficient than running on steep climbs. On descents, eccentric muscle loading (quads acting as brakes) creates its own metabolic cost - steep technical descents are far more demanding than the same gradient on a smooth fire road. The gain/100 + loss/150 asymmetry in the formula reflects this - gain is more costly per metre than loss, but loss is not free.
Power hiking threshold is flagged at segments where your computed pace exceeds 12 min/km (19 min/mile). This threshold corresponds to the crossover point where walking biomechanics become more efficient than running on steep uphill terrain. Strategic power hiking on marked segments preserves leg muscle for descents and reduces overall race time compared to running everything.
This km-effort model is the same formula used in TrailMath's training engine for load calculation (following Dan Johnston's asymmetric elevation scoring methodology), ensuring consistency between how your training load is measured and how your race effort is planned.
Minetti AE et al. (2002). Energy cost of walking and running at extreme uphill and downhill slopes. J Appl Physiol. 93(3):1039-46. Minetti AE et al. (1995). Mechanical determinants of gradient walking energetics in man. J Physiol. 481(Pt 1):235-43. ITRA. km-effort formula. International Trail Running Association. itra.run
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