Home Destinations France Auvergne-Rhône-AlpesCol du Glandon

Hard

Cycling

🇫🇷 France

Satellite

This track was identified and mapped via high-resolution satellite imagery.

ID: FR-ARA-20

Col du Glandon

Added on 10 Oct 2026

Logged by @trailx

Col du Glandon (1,924 m) is one of the great Tour de France climbs. The classic side starts in La Chambre: 21.3 km at an average 6.9%, gaining 1,472 m. The last 2 km from La Chambre are over 10%. First Tour appearance: 1947 (24 crossings).

Trail Map

Initialising Map Engine...

Trail Profile

General Instructions

Season: Mid-May to early November. 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.

Mission Logs53 waypoints

Distance	Direction & Instruction	Gradient
0.0 km	N Start Point	-2%
0.3 km	S Steep Descent	-10%
0.8 km	SE Terrain Change	-3%
1.3 km	SE Continue on track	0%
1.8 km	W Continue on track	2%

Note: Gear suggestions are based on terrain gradient and are for reference only.

Weather check

At Start

468m

Sampling Micro-Climate...

45.3576, 6.3010

Slide to preview conditions across the entire route • Point: 45.3576, 6.3010 @ 468m

Quick Stats

Distance

23.28 km

Type

Cycling Sector

Elevation Range

448m - 1917m

Max Elevation

1917 m

Max Gradient

25%

15.3%

Highlights

Ride the La Chambre side, the way the Tour climbs it
Top out at 1,924 m
The last 2 km from La Chambre are over 10%
Ride a climb from the 2025 Tour de France

Field Radio Protocol

VHF-UHF Communication

Signal Verified

Emergency Simplex

146.520MHz

Team Coordination

446.006MHz

Scout Primary

146.400MHz

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

+1469 m

Total Descent

-21 m

Ruggedness Index

Terrain Roughness Index

Vertical displacement per km. Typical range: 0 (Smooth) to 100+ (Extreme Mountain).

0 (Smooth)50 (Steep)100+ (Extreme)

64.0

Tortuosity Index

Route Curviness Index

Ratio of actual path to straight line. Typical range: 1.0 (Direct) to 3.0+ (Switchbacks).

1.0 (Direct)2.0 (Winding)3.0+ (Serpentine)

1.42

Gradient Distribution

Flat (0-3%)11%

Moderate (3-8%)21%

Steep (>8%)68%

Surface & Hydrology

Paved100%

Unpaved0%

Surface Spectrum Analysis

Asphalt

100%

Water Crossings

Includes only technical water fords where the vehicle actively enters a stream or riverbed. Permanent bridges are excluded from this count.

Difficulty Analysis

SCORE: 65

Difficulty is determined by a technical multi-vector analysis of elevation profile, surface quality, and topographic intensity.

Resulting CategoryHard

Bounding Box (WGS84)

MIN LAT: 45.239387

MAX LAT: 45.357605

MIN LON: 6.170190

MAX LON: 6.306599

Point Spacing: 14.9 m • Engine: TrailX Precision GPX ANALYTICS v1.0.0

Reviews & Discussion0

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Plan this trip

Before you go: Col du Glandon

Best time to go

Apr, May, Jun, Sep, Oct

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.