Stage 10 of 11 · Gr20

Calasima → Bonifato

Distance
19.5 km
Ascent
+2,275 m
Descent
-2,540 m
Est. Time
10h 14m
Altitude
1,220–2,595.5 m
Type
point-to-point
🏔️ Mountainous❄️ Alpine
🚌

Getting Here

Calasima (bus stop)

7971m from trailhead · ~116 min walk

🚌

Getting Out

Bonifato (bus stop)

8103m from trail end · ~115 min walk

📥 Download GPX 🗺️ Open in Planner 🏔️ 3D Flyover 19.5 km · 2,275m gain

Elevation Profile

1,400m1,600m1,800m2,000m2,200m2,400m2,600m0 km5 km10 km15 km20 km2,596m1,220m
Moderate (10–15%) Easy (5–10%) Flat (<5%)

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.

SegmentDist↑ / ↓TimeCharacter
Calasima → km 4.9 (1814m)
1,814–2,596m
4.9 km+1034m / -1057m3h 14m🏃 Highly Runnable
km 4.9 (1814m) → km 10.4 (1661m)
1,408–1,998m
5.5 km+1045m / -1198m3h 25m📉 Descending
km 10.4 (1661m) → Bonifato
1,220–2,046m
9.1 km+1511m / -1581m5h 07m📉 Descending
Total19.5 km+2,275m / -2,540m11h 48m

Pace & Fuel Calculator

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

7:00 /km
4:00 /km (elite) 12:00 /km (leisure)
Fast Hiker / Jogger
Est. Finish Time
6h 08m
Calories
2,854 kcal
Water Needed
4.1 L
Effort Distance
55 km
flat-equivalent
🍫 Recommended: ~45g carbs/hr (276g total) 🧂 Electrolytes: ~3070mg sodium/hr

Terrain Analysis

Runnability
0%
Steep / Technical
% of route below 15% gradient
Climb Ratio
117 m/km
Very steep profile
↑ 2,275m ↓ 2,540m

Surface & Technicality

Terrain Difficulty Breakdown
Runnable Flat (50%) Easy Grade (25%) Moderate Climb (25%)
Surface Type
Unknown (75%) Ground (14%) Asphalt (5%) Unpaved (4%) Sett (2%) Rock (1%) Wood (1%)

🏃 Mostly runnable with gentle terrain. Great for fast trail running.

Surface Breakdown

Unknown (74%)
Natural Ground (14%)
Paved (5%)
Unpaved Trail (4%)
Sett (2%)

Current Conditions

Loading live weather...

Conditions for June

ℹ️ Shoulder season
Snow Risk
5%
Unlikely
52% north-facing slopes
Mud Risk
30%
Moderate
Ice Risk
0%
Unlikely

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

🥾 Muddy sections likely. Waterproof boots recommended.

Best months: Mar, Apr, May, Jun, Sep, Oct, Nov

Suggested Gear List

Auto-generated based on 19.5 km, 2275m ascent, max altitude 2595.5m, ~10h duration.

Essential 8 items
  • 👟
    Trail running shoes / hiking boots
    Required for any trail
  • 📱
    Phone (charged) + offline map
    Navigation & emergency contact
  • 💧
    3L hydration vest
    Estimated 4.9L needed
  • 🍫
    Trail mix, bars & sandwich
    Est. 3398 kcal burn
  • 🧴
    Sunscreen SPF 50+
    UV intensifies above 2000m
  • 🧢
    Sun hat / cap
    Exposed alpine terrain
  • 🧥
    Windbreaker / shell jacket
    Summit at 2595.5m — wind chill
  • 🆘
    Emergency space blanket
    Critical if injured at altitude
Recommended 6 items
  • 🕶️
    Sunglasses (cat 3+)
    Snow & rock glare at altitude
  • 🧤
    Warm mid-layer (fleece)
    Temps drop ~6°C per 1000m
  • 🔦
    Headlamp
    10h route — plan for delays
  • 🩹
    Mini first aid kit
    Blister plasters, tape, antiseptic
  • 🥢
    Trekking poles
    0% steep terrain, 2275m+ ascent
  • 🧊
    Microspikes / light crampons
    Snow risk in Dec, Jan, Feb
Nice to have 1 items
  • 🦵
    Gaiters
    Keep snow out of boots

Logistics

This route runs from Calasima to Bonifato (19.5 km by trail). You'll need to arrange transport back to your starting point.

Start — Getting There
Calasima
🚌 Calasima (4.6km)
Finish — Getting Back
Bonifato
🚌 Bonifato (8.1km)
🗺️ Transit directions (Google)

Nearby Points of Interest

🚌 Transit Stops

  • Calasima km 1.6 · 4.6 km off trail
  • Asco Haut km 7.3 · 4.5 km off trail
  • Bonifato km 12 · 4.0 km off trail

🛖 Shelters

  • Shelter km 12.4 · 1.2 km off trail
  • Shelter km 16.7 · 1.0 km off trail

💧 Water Sources

  • Drinking Water 2.1 km off trail
  • Drinking Water 885m off trail
  • Drinking Water km 5.8 · 1.5 km off trail

🏠 Mountain Huts

  • Refuge 878m off trail
  • Bergerie de Tilarba (en ruine) km 0.1 · 1.7 km off trail
  • Refuge km 19.4 · On trail
←

Previous Stage

Gr20 Stage 9: Col de Vergio → Calasima

Next Stage

Gr20 Stage 11: Bonifato → End

→
← Back to all 11 stages of Gr20

Take this route with you

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Route data from OpenStreetMap © contributors, licensed under ODbL. Updated 2026-04-01.