Franches-Montagnes–Doubs Loop (Route 457)

Le Noirmont · Jura · Switzerland

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Route type unverifiedRoute type

13.79 kmDistance

4 h 25 minDuration

ModerateRecorded effort

705 mAccumulated ascent

Difficulty scale

Historic recorded designation; not verified as fitness or technique.

These groups reflect the recorded general designation, not a verified fitness or technical grade. Terrain, exposure, chains and ladders must be assessed separately; read the source notes. No SAC grade is inferred.

Official technique (source wording): medium mountain hiking trail
Official fitness (source wording): medium

SAC T-grade: not verified

Painted waymarks: not verified

Official route source

Safety and route notes

Existing editorial notes, not live trail status. Any check date below applies only to that static check; recheck official notices and local conditions before departure.

The official page identifies a very steep, slippery mountain ascent secured by chains and short ladders, and describes the Sommêtres ridge as narrow with near-vertical drops.
This route requires sure-footedness and a head for heights; avoid wet or icy conditions and do not confuse it with a climbing itinerary.
Take care beside the Doubs and do not infer safe swimming or access to optional ruins.
No fixed opening season or SAC grade is independently established.
Summer hiking entry: snow-free conditions are required.
No independently established fixed opening months or SAC T-grade are asserted.
Federal closure/diversion layer checked on 24 October 2026: no reported closure or diversion intersects this exact route; absence of a notice is not an assurance that the route is open.
Recheck official notices, local conditions and weather before departure.

Official route source

Map and track

Track with 1,234 imported points

Altitude and elevation

Elevation profile

969 mStart altitude

506 mMinimum altitude

1080 mMaximum altitude

705 mAccumulated ascent

705 mAccumulated descent

111 mAltitude differenceestimated · maximum altitude minus start altitude

About the trail

Follow the full official circuit from Le Noirmont down through forest to La Goule and along the Doubs to Le Theusseret. Climb back towards Chez-le-Bolé and the Sommêtres ridge area, then return towards Le Noirmont. The complete federal route is stored; no optional climbing route or invented ridge shortcut has been appended. Official reference: 14 km, +700/−700 m, 4.42 hours. Complete federal track: 13.79 km, accumulated +705/−705 m. Official classification: medium mountain hiking trail; medium fitness. The official page identifies a very steep, slippery mountain ascent secured by chains and short ladders, and describes the Sommêtres ridge as narrow with near-vertical drops. This route requires sure-footedness and a head for heights; avoid wet or icy conditions and do not confuse it with a climbing itinerary. Take care beside the Doubs and do not infer safe swimming or access to optional ruins. No fixed opening season or SAC grade is independently established. Summer hiking entry: snow-free conditions are required. No independently established fixed opening months or SAC T-grade are asserted. Federal closure/diversion layer checked on 24 October 2026: no reported closure or diversion intersects this exact route; absence of a notice is not an assurance that the route is open. Recheck official notices, local conditions and weather before departure. Official original name: Des Franches-Montagnes au Doubs. Source: https://schweizmobil.ch/en/hiking-in-switzerland/route-457. Geometry licence: OGD BY. Attribution: Bundesamt für Strassen, Kanton, Stiftung SchweizMobil.

Getting there and access

Location:: Le Noirmont · Jura · Switzerland
Track start:: 47.22377, 6.95724
Parking:: No data

Start coordinates: 47.22377, 6.95724

Check public transport and mountain roads before leaving; some routes close in winter.

Open directions

Recommended equipment

Unavailable

Not recorded. Missing information does not mean there is no risk.

Weather and official alerts

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The weather forecast does not confirm that the activity is safe. Check local conditions and official alerts before setting out.

Official alerts

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