On , returns — France's most prestigious Gran Fondo and, by elevation-per-kilometer ratio, one of the toughest amateur cycling events in the world. through (Col du Glandon, Col du Télégraphe, Col du Galibier and the legendary 21-hairpin finish up Alpe d'Huez), starting in Bourg-d'Oisans at 07:00 and finishing at the Alpe d'Huez ski station at 1,860 m. drawn from a lottery of approximately 20,000 international entries will tackle this temple of cycling. This guide covers what neither the official site nor finisher blogs tell in full: how the day breaks, what to eat, how to train for an event you can't simulate on flat roads, and what really happens when you attack Alpe d'Huez with 145 km and three passes already in your legs.
What La Marmotte actually is, why it's the quintessential Alpine Gran Fondo, and how to honestly decide if it's for you today.
La Marmotte Granfondo Alpes is not a professional race or a tourist ride — it's an amateur Gran Fondo at the highest level, on roads shared with controlled traffic during Saturday morning, crossing the most iconic Tour de France climbs. Since its first edition in 1982, the Marmotte family and Velo Magazine have made it the definitive rite of passage for any European cyclist. The unwritten motto: "if you finish La Marmotte, you're a cyclist."
Is it for you?
Yes, if you've finished at least one major Gran Fondo with 3,000+ m elevation, have two seasons of regular cycling, and have completed 6+ hour rides with serious climbing.
Maybe, if you come from long-course triathlon or flat ultra-distance cycling. You lack specific sustained-climbing volume — train 12–16 weeks with focus on long passes before signing up.
Not yet, if you've never climbed a pass over 60 minutes, struggle with altitude above 2,000 m, or haven't built at least 4,000–5,000 km in the prior season.
The key difference vs other European events: the finish at Alpe d'Huez. No other elite Gran Fondo ends on such an iconic climb, with 21 numbered hairpins acting as a symbolic countdown. And the key difference vs L'Étape du Tour: La Marmotte has 30 km and 1,500 m more elevation, with a much harsher profile.
Start at Bourg-d'Oisans (720 m) at 07:00 in waves. The first 30 km are rolling along the Romanche and Rhône valleys towards the foot of Glandon. Classic temptation: ride with the big group at first-wave pace. Costly mistake: burning matches you'll need on Alpe d'Huez. Stay at 65–70 % FTP, eat in these first 60 minutes, hydrate.
The first climb. Long and irregular: 8–10 % ramps alternating with false flats where your companion's wheel deceives you. Strategy: climb at 70 % FTP, not a watt more. It's the only way to reach Galibier intact. The descent of Glandon towards Saint-Étienne-de-Cuines is technical and tight — multiple hairpins and 12 % gradients. Be careful, accidents have happened. Don't gamble.
25 km of transition along the Arc valley towards Saint-Michel-de-Maurienne. It's false-flat ascending with frequent headwind. Use group dynamics. Eat 60–90 g carbs/h. You lose many places here if alone or if you neglect nutrition.
Regular and technical climb. Not the day's hard climb, but it arrives when you already have 80 km and 2,000 m in your legs. Strategy: maintain the same 70 % FTP as Glandon. Don't attack. Immediately at the top, a short 5 km descent to Valloire — the only point where you can refill water and eat solid food before Galibier.
The day's pass. Second-highest paved pass in Europe. The final ramp from Plan Lachat (km 105) has 9–10 % stretches at 2,500 m altitude, where every watt costs double due to oxygen scarcity. This is where time happens:
Sub-1h45 → final time of 7h–7h30.
2h00 → 8h–8h30.
2h30+ → headed for 9h30+, watch out.
Real cold up top (5–10 °C, 0–5 °C in cold years). Carry a windproof jacket in your back pocket — the descent towards Lautaret and Bourg-d'Oisans (32 km) is long and you cool fast.
Technical, long and very fast descent — peaks of 80 km/h in places. This is where people break (crashes, cold, mild hypothermia, distraction). After Lautaret you enter false-flat descent on the N91 towards Bourg-d'Oisans. Take advantage to eat and drink continuously. You arrive at the foot of the Alpe with 145 km and 3,500 m+ in the legs.
The finale. Absolutely iconic climb. The first 3 hairpins are the hardest (10–11 %). It then stabilizes at 7–9 %. Your final time is decided here: average ranging between 45 minutes (élite) and 1h45 (sub-10h). Half the field walks the last 3 hairpins. Your job: don't go to zero. Save matches on the prior climbs, take a gel with 5 km to go, and push from hairpin 7 down. Finish at the ski station at 1,860 m.
44 years of tradition, organized by Velo Magazine and the Marmotte family since 1982.
The first edition took place in 1982 with just a few hundred French cyclists wanting to test their legs on Tour passes ahead of the annual Tour passage. Organization has passed through Velo Magazine, the historic sponsor, and the Marmotte family, who have maintained the philosophy: one route, one day, emblematic roads, honest difficulty.
Since the '90s, the event has grown to today's ~7,000 bibs and become a must-do for cyclists from the UK, Netherlands, Belgium, Germany, the United States and Australia. About 70 % of participants are international, with strong Anglo and Dutch presence.
Records: Men ~5h42, Women ~7h05 (consult the official archive for current data). Only ~3 % of the field breaks 7 hours.
Bourg-d'Oisans is 60 km from Grenoble. Plane, train, car and bike.
Lyon-Saint Exupéry (LYS) — 130 km, 2 h by car. Best international option.
Geneva Airport (GVA) — 200 km, 2.5 h. Ideal for Central/Northern Europe flights.
Grenoble Alpes-Isère Airport (GNB) — 60 km, 1 h. Seasonal, limited flights.
TGV train — Paris-Grenoble in 3 h, then Transisère bus to Bourg-d'Oisans (1 h).
Car: from Barcelona ~700 km / 7 h. From Madrid ~1,300 km. From Milan ~400 km / 5 h via Fréjus or Mont Blanc tunnel.
Bike tip: flying with a bike costs €60–150 per leg. Reserve a hard case in advance. If driving, parking in Bourg-d'Oisans is scarce on Friday/Saturday.
Book before January. Three zones: Bourg-d'Oisans, Alpe d'Huez and Grenoble.
1. Bourg-d'Oisans (start) — recommended:
Hôtel Le Florentin (3*) — central, bike parking.
Hôtel Le Vallée Blanche (3*) — group options.
Gîtes and chambres d'hôtes — €60–100/night.
2. Alpe d'Huez (finish, 1,860 m):
Hôtel Royal Ours Blanc (4*) — panoramic terrace.
Le Daria-I Nor (4*) — modern, spa.
Hôtel Le Pic Blanc (4*) — ski-in with views over the Massif des Grandes Rousses.
3. Grenoble (60 km):
Park Hotel Grenoble (4*) — good base if flying into LYS/GNB.
Best Western Hôtel Le Charlemagne (3*) — value.
Logistics tip: sleep in Bourg-d'Oisans Friday night and move car/luggage to Alpe d'Huez to rest at the top after the finish. You'll be wrecked and the 32 km descent isn't appealing.
24 weeks minimum. Focus: specific climbing volume, FTP, altitude resistance.
Block 1 — base (weeks 1–8): aerobic volume, 8–12 h/week, long rides 4–6 h, one weekly long-climb session.
Block 2 — specific (weeks 9–16): FTP intervals (4×8'), blocks of 2,500–4,000 m elevation in a single ride. At least one 5,000+ m elevation ride before the event.
Block 3 — pre-Marmotte (weeks 17–22): simulate the day. Two rides with 4,000+ m including technical descents. Practice nutrition at 90 g carbs/h.
Enter your goal time and get climb-by-climb splits.
🎯 Calculadora de ritmo y splitsEscribe tu tiempo objetivo para La Marmotte Alpes
Ritmo medio requerido3:06 min/km
Equivalente en millas5:00 min/mi
Punto
Tiempo acumulado
Parcial
5 km
15:31
15:31
10 km
31:02
15:31
15 km
46:33
15:31
Media (21,1 km)
1:05:29
18:55
30 km
1:33:06
27:38
Meta
9:00:00
7:26:54
Splits asumen ritmo constante. En carreras con desnivel real (La Marmotte Alpes) — banca 5–8 s/km en bajadas y pierde el mismo margen en subidas; el ritmo medio se mantiene.
Historically between 30–35 %. Depends on annual demand, which has grown post-pandemic. If you have 3+ years of participant loyalty, some entry channels offer advantages. Plan B: charity €350–500.
La Marmotte vs L'Étape du Tour: which one?
L'Étape du Tour is shorter (~145 km vs 174 km), with less elevation (~3,500 m vs 5,000+ m) and a route that varies each year (replicates a specific Tour stage). La Marmotte is always the same route and always brutal. If it's your first serious Alpine Gran Fondo, start with L'Étape. If you've already done 4,000+ m, La Marmotte is the next step.
Why is the Alpe d'Huez finish so hard?
Because you arrive with 145 km and 3,500 m+ in your legs. The first 3 hairpins have 10–11 % ramps. Altitude (1,860 m) already weighs. And mentally: 21 hairpins is a long count when you're empty. Half the field walks the last 3.
How does cold affect Galibier?
At 2,642 m in July you can find 0–10 °C. If you descend wet with sweat without a jacket, mild hypothermia is guaranteed within 10 minutes. Always carry a windproof in your pocket. Not optional.
Can I rent a bike in Bourg-d'Oisans?
Yes. Local shops like Cycles Cyril and Bike Park Alpe d'Huez rent endurance carbon bikes with big cassettes for €70–120/day. Reserve 6 months ahead. Bring your own pedals and saddle.
Is it good for my first mountain Gran Fondo?
No. Start with one of 100–130 km and 2,500–3,500 m+. Quebrantahuesos, Maratona dles Dolomites or L'Étape du Tour are more reasonable steps. La Marmotte demands prior base.
How strict is the 10-hour cutoff?
Quite strict. There are intermediate cutoffs at Galibier and the foot of Alpe d'Huez. If you arrive late at Galibier, you're rerouted via the short course and there's no official finisher status. Plan: sub-9h realistic target, sub-10h safety margin.
Is pre-ride reconnaissance worth it?
Very much. If you can spend 3–4 days in Bourg-d'Oisans the week before and ride Alpe d'Huez, Glandon and the Galibier final ramp, you save 30–60 minutes in pacing. Altitude, heat and psychology change with reconnaissance.
