This track was identified and mapped via high-resolution satellite imagery.
Col de l'Iseran
Col de l'Iseran (2,764 m) is one of the great Tour de France climbs. The classic side starts in Bonneval-sur-Arc: 13.4 km at an average 7.3%, gaining 977 m. Highest paved pass in the Alps. High point of the Route des Grandes Alpes. First Tour appearance: 1938 (about 8 crossings). Hail and a mudslide stopped the 2019 stage. Egan Bernal took yellow on the summit.
Trail Map
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Trail Profile
General Instructions
Season: Mid-June to late October. Carry a windproof layer for the descent, enough water and food for the climb, and check road status before you go. Descend with care: these are open roads shared with cars and motorbikes. At 2,764 m the summit can be near freezing even in summer.
Weather check
Sampling Micro-Climate...
45.3717, 7.0468
Slide to preview conditions across the entire route • Point: 45.3717, 7.0468 @ 1791m
Quick Stats
Highlights
- Ride the Bonneval-sur-Arc side, the way the Tour climbs it
- Top out at 2,764 m
- Hail and a mudslide stopped the 2019 stage. Egan Bernal took yellow on the summit
- Highest paved pass in the Alps
Field Radio Protocol
VHF-UHF Communication
Propagation Telemetry
Ridge Line
92%Gorge Floor
18%Sector Relay: Sector Alpha Relay• 12-18 KM Range
Regulatory Compliance
VHF/UHF frequencies are for monitoring and emergency coordination only. Transmitting on these bands may require an Amateur Radio License or regional government permits. Check local telecommunications laws before operation.
Technical Analysis
Total Ascent
+970 m
Total Descent
-2 m
Ruggedness Index
Terrain Roughness Index
Vertical displacement per km. Typical range: 0 (Smooth) to 100+ (Extreme Mountain).
72.1
Tortuosity Index
Route Curviness Index
Ratio of actual path to straight line. Typical range: 1.0 (Direct) to 3.0+ (Switchbacks).
2.6
Gradient Distribution
Surface & Hydrology
Surface Spectrum Analysis
Includes only technical water fords where the vehicle actively enters a stream or riverbed. Permanent bridges are excluded from this count.
Difficulty Analysis
Difficulty is determined by a technical multi-vector analysis of elevation profile, surface quality, and topographic intensity.
Bounding Box (WGS84)
Point Spacing: 17 m • Engine: TrailX Precision GPX ANALYTICS v1.0.0
Reviews & Discussion0
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Plan this trip
Before you go: Col de l'Iseran
Best time to go
Jun–Sep
Mid-June to mid-September is the season for high Alpine routes such as the Tour du Mont Blanc; huts are generally open then and passes are mostly clear of snow. Lower routes around Lyon and the Drôme are good in spring and autumn.
Navigate it offline
Download this trail and its map in the free TrailX app for turn-by-turn guidance, off-route alerts and GPS recording without signal.
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