The GR5 traverses the Haut-Jura Natural Regional Park along a high ridge forming the Franco-Swiss border in Bourgogne-Franche-Comté, climbing through limestone plateaux, dense spruce forests, and glacial lake basins from 900m to the Crêt de la Neige summit at 1,720m in the Ain department — the highest point in the entire Jura massif. The complete Tour du Haut-Jura circuit covers approximately 220km and requires 8 to 12 days for the full loop, though individual day sections of 10 to 25km are accessible from Les Rousses, Saint-Claude, or Mijoux without committing to the full trek.
The main trailhead is at Les Rousses (39220), reached via the N5 from Pontarlier, approximately 50km from Besançon. Parking is available at the Route des Pyrénées car park alongside the Lac des Rousses. The nearest rail connection is Morez station, 15km south, served by TER trains from Besançon, with additional Mobigo bus connections from Lons-le-Saunier. No permit is required to walk any section of the GR5 in the Haut-Jura.
Lower trail sections follow compacted dirt and forest tracks through mixed spruce and beech woodland. Above 1,400m the route shifts to rocky limestone crêtes with short scrambles and fully exposed ridgelines. Shade is ample in forested zones but absent on the high ridge; carrying sun protection and a windproof layer is advisable even in summer. Potable water is available at farmsteads and springs, though treating before drinking is recommended.
Key landmarks along the route include the Crêt de la Neige (1,720m), viewpoints over the Swiss Plateau at the Pic de l'Aigle, and the historic town of Saint-Claude known for its centuries-old pipe-making heritage. Gîtes d'étape at Les Rousses, Lajoux, and La Pesse provide simple overnight accommodation; advance booking is essential from July through August. Wild camping is prohibited in most of the Haut-Jura Natural Regional Park.
Ticks are active in the lower forest zones from April through October and repellent is strongly advisable. Afternoon thunderstorms build rapidly over the exposed ridges in July and August; walkers on high sections should aim to descend below 1,400m before 14:00. Snow may persist on north-facing slopes above 1,400m well into June, restricting the practical season for the summit ridge to mid-July through mid-September.
Trail facts
- Trail area
- Haut-Jura Natural Regional Park, Ain and Jura departments
- Best season
- July–September for high-altitude sections; May–June and October for lower trails
What to bring
Walking boots with ankle support, waterproof jacket, 1:25,000 IGN map (Top25 No. 3329OT and 3430OT), emergency whistle, tick repellent
Location
Trailhead: Les Rousses, Route des Pyrénées, 39220 Les Rousses
46.4722, 6.0669 View on map
Highlights
- Crêt de la Neige at 1,720m — the highest point in the Jura massif, with views spanning the Swiss Plateau and Lake Geneva arc
- High ridge traverse along the Franco-Swiss border through exposed limestone crêtes above 1,400m
- Day-section flexibility from Les Rousses: accessible 10–20km stretches without committing to the full 8–12 day circuit
- Historic town of Saint-Claude — a centre of pipe-making heritage set within the natural park boundary
- Gîtes d'étape at Les Rousses, Lajoux, and La Pesse supporting multi-day walkers with simple accommodation and meals
Tips for visiting
- Start ridge sections before 13:00 to avoid afternoon thunderstorms that build rapidly on exposed crêtes above 1,400m
- Book gîtes at Les Rousses, Lajoux, or La Pesse well in advance — July and August availability fills quickly
- Carry IGN Top25 maps 3329OT and 3430OT; GPS signal drops in dense spruce forest on the lower trail sections
- Apply tick repellent before entering any forest section and check thoroughly after — Lyme disease risk is significant in the Haut-Jura
- Confirm the Crêt de la Neige access road from Lelex is open before driving up — late snowfall can close it into early summer
When to visit
Mid-July to mid-September is optimal for the high-altitude ridge sections; the lower forest trails are accessible May to October. Early morning starts are advisable from June to August to avoid lightning risk on exposed crêtes.
Accessibility
Not suitable for wheelchair or stroller use. The high ridge sections involve rocky, uneven limestone terrain and short scrambles with no handrails or paved surfaces. No accessible sections exist along this route.
Frequently asked questions
Can the GR5 Haut-Jura sections be walked as day hikes rather than a multi-day circuit?
Yes. Individual sections of 10 to 25km are well suited to day hiking from bases such as Les Rousses or Saint-Claude. IGN Top25 maps identify the most accessible short-loop options from each village.
Are there mountain huts or gîtes along the full circuit?
Gîtes d'étape at Les Rousses, Lajoux, and La Pesse offer simple accommodation and meals along the circuit. Advance booking is essential in July and August. Wild camping is prohibited in most of the Haut-Jura Natural Regional Park.
When is the best time to walk the high ridge sections?
Mid-July to mid-September offers the most reliable conditions. Snow can persist on north-facing crêtes above 1,400m into June, and early October storms can bring ice back quickly. Lower forest sections are accessible from May to October.
Is a permit required to walk the GR5 in the Haut-Jura?
No permit is required. Some sections cross private farmland where walkers are expected to stay on the marked path, particularly on plateau sections with active cattle grazing. Closing field gates is standard practice.