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Gran Fondo · Race Guide

Marmotte Granfondo Alpes

A classic Alpine mountain marathon over Glandon, Télégraphe, Galibier and Lautaret, finishing on Alpe d’Huez.

Register early, pace the first three passes, and carry summit layers for Galibier before the final Alpe d’Huez climb.

Best for

  • ✓Experienced high-mountain climbers
  • ✓Riders seeking a full Alpine big day
  • ✓Strong club riders with 6-9 hour endurance
  • ✓Riders comfortable on open roads
  • ✓Tour de France climb enthusiasts

Watch out for

  • !Tiered pricing rises
  • !Open-road traffic
  • !Extreme one-day difficulty
  • !Cold or storms on Galibier
  • !Accommodation pressure

D-Score™

D+

Epic

Entry

First-come online registration with tiered pricing

or Rando des Marmottes two-day option

Route

177 km

5,000 m climbing

Terrain

Mountain

Smooth Alpine tarmac

Month

June

Annual event

Temperature

Approximately 0-30 °C

Valley to summit

Roads / Format

Open roads under the French Highway Code

Mass start from Bourg-d’Oisans

Participants

Historic cap around 7,000; current figure needs verification

Per edition

GPX

Download

Route files

View French Alps tours
Official race website Bourg-d’Oisans Tourism

Derailleur verdict

One of Europe’s definitive one-day mountain challenges, combining iconic Tour climbs, open roads and extreme accumulated fatigue.

Best for

  • •Experienced high-mountain climbers
  • •Riders seeking a full Alpine big day
  • •Strong club riders with 6-9 hour endurance
  • •Riders comfortable on open roads
  • •Tour de France climb enthusiasts

Not ideal for

  • •First-time mountain sportive riders
  • •Riders uncomfortable in traffic
  • •Anyone without a robust nutrition and weather plan

Entry

Entry options

Main MethodFirst-come online registration with tiered pricing
Lottery oddsNone
Entry difficultyHistorically high
AlternativesRando des Marmottes two-day option · Grimpée Alpe d’Huez time trial · Possible charity or tour packages needing verification
Guaranteed entryNeeds verification
RegistrationRegister on the official site and confirm licence or medical requirements

Register early for price and capacity, then book Bourg-d’Oisans or Alpe d’Huez accommodation immediately.

Tours and packages

No Marmotte Granfondo Alpes-specific tours listed yet

Explore French Alps cycling tours and providers, or get notified when race packages are added.

View French Alps tours

View providers (Coming soon)

Get notified (Coming soon)

Route difficulty and ride feel

Route options

RouteDistanceClimbingD-Score
Grimpée Alpe d’Huez13.8 km1,100 mD1
Rando des Marmottes (two-day)177 km total5,000 m totalD3
Marmotte Granfondo Alpes177 km5,000 mD+

Key demands

SurfaceSmooth Alpine tarmac
Road tatusOpen roads under the French Highway Code
Main challengeFour major passes and 5,000 m of climbing ending on Alpe d’Huez
Descending riskMedium-high — Glandon descent neutralised for safety
Traffic exposurePresent throughout
Bunch densityHigh early, thinning from the first climb

The route climbs almost continuously after Glandon. Long exposed passes test pacing and nutrition, while Alpe d’Huez arrives after roughly 5,000 m of prior climbing.

Route, climbs and pro-race roads

Several climbs on this route appear in Giro d'Italia history. The full route includes seven major passes.

ClimbLengthAvg gradientWhy it matters
Col du Glandon27.5 km4.5 %First major climb; long and uneven, with a neutralised descent.
Col du Télégraphe11.8 km7.3 %Gateway climb before the Galibier.
Col du Galibier17.7 km6.9 %High point of the route at 2,642 m.
Col du Lautaret8.5 km3.8 %Pass crossed on the return toward Bourg-d’Oisans.
Alpe d’Huez13.8 km8.1 %Final 21-hairpin summit finish.

Gearing & fuelling tools

Every rider has unique gearing and nutrition needs. Below are tools we find useful for working these out before race day.

Planning and logistics

Nearest airports

Grenoble Alpes-Isère · Lyon–Saint-Exupéry · Geneva

Car hire

Useful unless using a tour package or organised transfer

Book ahead

Book early because both start and finish towns fill quickly

Bourg-d’Oisans is best for the start; Alpe d’Huez hosts the finish and race village. Plan return transport between them.

Weather and mountain conditions

Warm valleys can coexist with near-freezing wind, rain or snow near Galibier.

Valley temperatureWarm summer conditions; exact range needs verification
Summit temperatureNear-freezing possible at Galibier
Rain / stormsAlpine storms possible
Weather changesFast with altitude
Surface conditionsSmooth tarmac, potentially wet and cold on high passes
Main riskCold exposure on Galibier and long descents

What to consider packing

  • Gilet or rain shell
  • Warm gloves
  • Arm and leg warmers
  • Sun protection
  • Basic spares

Event feel

Event size

Major historic Alpine gran fondo

Field level

Strong and experienced

Atmosphere

Prestigious bucket-list mountain marathon

International mix

High

Bunch intensity

High early, low on later passes

First-timer

Use the two-day Rando or gain experience on a D3-D4 mountain event first.

Training profile

You should be comfortable with

  • Comfortable with 6-9 hour mountain days
  • Confident descending on open roads
  • Able to fuel through 5,000 m climbing
  • Prepared for extreme temperature swings

Preparation priorities

1

High-altitude climbing endurance

Train the Glandon, Télégraphe and Galibier style of repeated long climbs.

2

Descending confidence

Prepare for fast open-road descents and the technical Glandon section.

3

Heat-to-cold adaptation

Practise clothing and fuelling across large temperature swings.

4

Traffic awareness

Remain confident and predictable on open roads.

5

Nutrition strategy

Plan consistent intake over a genuinely long mountain day.