Stage 2 of 8 · Tour du Mont Blanc

Bionnay → Le Barattet

Distance

18.1 km

Ascent

+1,491 m

Descent

-255 m

Est. Time

6h 19m

Altitude

1,013.7–2,431.8 m

Type

point-to-point

🏔️ Mountainous❄️ Alpine

🚌

Getting Here

Bionnay (bus stop)

787m from trailhead · ~10 min walk

🚌

Getting Out

Le Barattet (bus stop)

9357m from trail end · ~117 min walk

📥 Download GPX 🗺️ Open in Planner 🏔️ 3D Flyover 18.1 km · 1,491m gain

Elevation Profile

Moderate (10–15%) Flat (<5%) Easy (5–10%) Steep (15–25%)

Route Map

🗺️ Open in Planner → | 🏔️ View 3D Flyover →

Segment Breakdown

Auto-analyzed from the elevation profile. Each segment shows the dominant character for planning your effort.

Segment	Dist	↑ / ↓	Time	Character
Bionnay → km 6.5 (1158m) 1,014–1,198m	6.5 km	+270m / -311m	1h 53m	🏃 Highly Runnable
km 6.5 (1158m) → km 14.2 (1858m) 1,156–1,858m	7.7 km	+730m / -30m	2h 46m	🔺 Steep Climb
km 14.2 (1858m) → Le Barattet 1,858–2,432m	3.9 km	+598m / -50m	1h 48m	🔺 Steep Climb
Total	18.1 km	+1,491m / -255m	6h 28m

Pace & Fuel Calculator

Adjust your flat 10K pace to see personalized finish time, calorie burn, and hydration needs.

Your flat 10K pace 7:00 /km

4:00 /km (elite) 12:00 /km (leisure)

Fast Hiker / Jogger

Est. Finish Time

4h 06m

Calories

3,416 kcal

Water Needed

3.3 L

Effort Distance

34.3 km

flat-equivalent

🍫 Recommended: ~45g carbs/hr (185g total) 🧂 Electrolytes: ~2053mg sodium/hr

Terrain Analysis

Runnability

Steep / Technical

% of route below 15% gradient

Climb Ratio

82 m/km

Very steep profile

↑ 1,491m ↓ 255m

Surface & Technicality

Terrain Difficulty Breakdown

Runnable Flat (17%) Easy Grade (43%) Moderate Climb (22%) Steep (17%)

🥾 Mixed terrain: expect sustained climbs between runnable sections.

Current Conditions

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Conditions for June

ℹ️ Shoulder season

Snow Risk

Unlikely

82% north-facing slopes

Mud Risk

30%

Moderate

Ice Risk

Unlikely

✅ Snow unlikely at this elevation in June. Trail conditions expected to be clear.

🥾 Muddy sections likely. Waterproof boots recommended.

Best months: 5, 6, 7, 8, 9, 10

Suggested Gear List

Auto-generated based on 18.1 km, 1491m ascent, max altitude 2431.8m, ~6h duration.

Essential 8 items

👟
Trail running shoes / hiking boots

Required for any trail
📱
Phone (charged) + offline map

Navigation & emergency contact
💧
3L hydration vest

No water sources on route
🍫
Trail mix, bars & sandwich

Est. 3972 kcal burn
🧴
Sunscreen SPF 50+

UV intensifies above 2000m
🧢
Sun hat / cap

Exposed alpine terrain
🧥
Windbreaker / shell jacket

Summit at 2431.8m — wind chill
🆘
Emergency space blanket

Critical for preventing hypothermia if you stop moving