Skip to content
TrailMath
Language EN FR
TDS (Sur les Traces des Ducs de Savoie)

TDS Aid Station Planner

All 23 TDS checkpoints pre-loaded. Enter your goal finish time to get estimated arrival times at every aid station.

148km9,300m D+23 checkpointsCutoff: 44h55

Full TDS (Sur les Traces des Ducs de Savoie) course data: aid stations, cutoffs, course profile

Enter a goal TDS finish time and get estimated arrival times at every checkpoint - 148 km with around 9,300 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 (23)

Cutoff Tue 03:30

Cutoff Tue 08:30

Cutoff Tue 11:00

Cutoff Tue 13:45

Cutoff Tue 17:15

Cutoff Tue 19:30

Cutoff Wed 03:00

Cutoff Wed 05:30

Cutoff Wed 11:15

Cutoff Wed 13:15

Cutoff Wed 18:15

Cutoff Wed 19:15

Cutoff Wed 20:45

Crew may meet you at
  • Bourg Saint-Maurice 51.1 km, by Tue 11:28
  • Beaufort 92.3 km, by Tue 23:12
  • Les Contamines 122.8 km, by Wed 06:28
Drop bags
  • Beaufort 92.3 km, by Tue 23:12

  1. Checrouit - Maison Vieillelikely hiking (pace)

    Tue 01:56

    Leave by Tue 01:25Set by Lac Combal

    Dist (km)
    7.7
    D+ (m)
    +808
    Seg time
    2:06:02
    Seg pace/km
    16:22

  2. Arete du Mont-Favrelikely hiking (pace)

    Tue 03:07

    Leave by Tue 02:36Set by Lac Combal

    Dist (km)
    12.2
    D+ (m)
    +463
    Seg time
    1:11:32
    Seg pace/km
    15:54

  3. Lac Comballikely hiking (pace)

    Tue 04:00

    Cutoff Tue 03:30-31 minBehind cutoff

    Leave by Tue 03:32Set by Bourg Saint-Maurice

    Dist (km)
    16.5
    D+ (m)
    +21
    Seg time
    0:53:13
    Seg pace/km
    12:23

  4. Col Chavanneslikely hiking (pace)

    Tue 05:19

    Leave by Tue 04:51Set by Bourg Saint-Maurice

    Dist (km)
    20.6
    D+ (m)
    +602
    Seg time
    1:18:59
    Seg pace/km
    19:16

  5. La Thuile - Petit St Bernardlikely hiking (pace)

    Tue 08:34

    Cutoff Tue 08:30-4 minBehind cutoff

    Leave by Tue 08:05Set by Bourg Saint-Maurice

    Dist (km)
    36.2
    D+ (m)
    +492
    Seg time
    3:14:33
    Seg pace/km
    12:28

  6. Seezlikely hiking (pace)

    Tue 10:54

    Leave by Tue 10:25Set by Bourg Saint-Maurice

    Dist (km)
    47.5
    D+ (m)
    +15
    Seg time
    2:19:51
    Seg pace/km
    12:23

  7. Bourg Saint-Maurice

    Tue 11:28

    Cutoff Tue 11:00-29 minBehind cutoff

    Leave by Tue 11:40Set by Fort de la Platte

    Dist (km)
    51.1
    D+ (m)
    +32
    Seg time
    0:34:25
    Seg pace/km
    9:34

  8. Fort de la Plattelikely hiking (pace)

    Tue 13:32

    Cutoff Tue 13:4512 minTight

    Leave by Tue 14:24Set by Cormet de Roselend

    Dist (km)
    55.7
    D+ (m)
    +1133
    Seg time
    2:04:22
    Seg pace/km
    27:02

  9. Passeur de Pralognanlikely hiking (pace)

    Tue 15:27

    Leave by Tue 16:19Set by Cormet de Roselend

    Dist (km)
    61.9
    D+ (m)
    +759
    Seg time
    1:54:27
    Seg pace/km
    18:28

  10. Cormet de Roselendlikely hiking (pace)

    Tue 16:23

    Cutoff Tue 17:1552 minTight

    Leave by Tue 17:36Set by La Gittaz

    Dist (km)
    66.1
    D+ (m)
    +3
    Seg time
    0:55:57
    Seg pace/km
    13:19

  11. La Gittazlikely hiking (pace)

    Tue 18:17

    Cutoff Tue 19:301h13Tight

    Leave by Tue 22:04Set by Beaufort

    Dist (km)
    73.6
    D+ (m)
    +367
    Seg time
    1:53:40
    Seg pace/km
    15:09

  12. Entre deux Nantslikely hiking (pace)

    Tue 19:20

    Leave by Tue 23:08Set by Beaufort

    Dist (km)
    76.7
    D+ (m)
    +508
    Seg time
    1:03:50
    Seg pace/km
    20:36

  13. Pas d'Outraylikely hiking (pace)

    Tue 21:04

    Leave by Wed 00:52Set by Beaufort

    Dist (km)
    83.6
    D+ (m)
    +426
    Seg time
    1:43:38
    Seg pace/km
    15:01

  14. Beaufortlikely hiking (pace)

    Tue 23:12

    Cutoff Wed 03:003h48

    Leave by Wed 03:59Set by Hauteluce

    Dist (km)
    92.3
    D+ (m)
    +35
    Seg time
    2:07:41
    Seg pace/km
    14:41

  15. Hautelucelikely hiking (pace)

    Wed 00:42

    Cutoff Wed 05:304h47

    Leave by Wed 06:57Set by Le Signal

    Dist (km)
    98.6
    D+ (m)
    +498
    Seg time
    1:30:22
    Seg pace/km
    14:21

  16. Barrage de la Girottelikely hiking (pace)

    Wed 03:08

    Leave by Wed 09:24Set by Le Signal

    Dist (km)
    107.1
    D+ (m)
    +882
    Seg time
    2:26:17
    Seg pace/km
    17:13

  17. Le Signallikely hiking (pace)

    Wed 04:59

    Cutoff Wed 11:156h15

    Leave by Wed 11:46Set by Les Contamines

    Dist (km)
    115.3
    D+ (m)
    +433
    Seg time
    1:50:47
    Seg pace/km
    13:31

  18. Les Contamines

    Wed 06:28

    Cutoff Wed 13:156h47

    Leave by Wed 13:42Set by Les Houches

    Dist (km)
    122.8
    D+ (m)
    +15
    Seg time
    1:28:30
    Seg pace/km
    11:48

  19. Col de Tricotlikely hiking (pace)

    Wed 09:02

    Leave by Wed 16:17Set by Les Houches

    Dist (km)
    130.2
    D+ (m)
    +1149
    Seg time
    2:34:36
    Seg pace/km
    20:54

  20. Bellevuelikely hiking (pace)

    Wed 10:53

    Cutoff Wed 18:157h21

    Leave by Wed 18:08Set by Les Houches

    Dist (km)
    136.8
    D+ (m)
    +400
    Seg time
    1:50:52
    Seg pace/km
    16:48

  21. Les Houcheslikely hiking (pace)

    Wed 12:00

    Cutoff Wed 19:157h15

    Leave by Wed 19:24Set by Chamonix (Finish)

    Dist (km)
    141.4
    D+ (m)
    +0
    Seg time
    1:06:37
    Seg pace/km
    14:29

  22. Chamonix (Finish)likely hiking (pace)

    Wed 13:21

    Cutoff Wed 20:457h24

    Dist (km)
    148.0
    D+ (m)
    +259
    Seg time
    1:20:49
    Seg pace/km
    12:15

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

Calculate nutrition →

TDS course in numbers

Climbing per km
63 m
ITRA km-effort
241 (100M)
Highest point
2,580 m
Biggest climb
+1,556 m over 9.0 km at 17.3% (through Bourg Saint-Maurice)
Steepest climb
+560 m over 2.3 km at 24.8%
Longest descent
-1,394 m over 13.1 km at 10.5% (through Seez)
Track climbing above 3%
39%
Winning time / cutoff
18h30 / 44h55 (2.4x the winner's time)

Section-by-section climbs, descents and grades are on the TDS course page.

About TDS (Sur les Traces des Ducs de Savoie)

TDS (Sur les Traces des Ducs de Savoie) covers 148 km with around 9,300 m of elevation gain, starting in Courmayeur, Italy. The overall cutoff is 44 hours 55 minutes.

Crew access is allowed at Bourg Saint-Maurice (51.1 km), Beaufort (92.3 km) and Les Contamines (122.8 km). Drop bags are available at Beaufort.

Checkpoint data approximate - verify against the current official race guide at montblanc.utmb.world before your race.

How the splits are allocated

Your goal time is split across the TDS legs by km-effort: distance + gain/100 + loss/200. Full methodology.

Related tools

TDS Finish Time Predictor Predict your TDS finish time Nutrition Calculator Calories, carbs & hydration targets Aid Station Planner Checkpoint times & pacing plan

Track your TDS plan, crew notes, and live progress in the app

TrailMath uses these models to build periodized plans adjusted to your goals and terrain.

Start free