Grand Som
📍 Rhone-Alpes , Departement de l'Isere · Nearest city: Saint-Laurent-du-Pont (6 km)
50 XC score / 100 · takeoff at 1578 m · 📍 View on map
Coordinates and external links
45.37190, 5.81278Forecast next days
Updated: 2026-04-19 16:22 UTC · Source: Open-Meteo · Thermal window 10:00–18:00 local time
Día volable, condiciones decentes, base de cúmulos ~704 m, viento 9 km/h.
base ~704m · wind 9 km/hDía volable, condiciones decentes, base de cúmulos ~652 m, viento 10 km/h.
base ~652m · wind 10 km/hCondiciones marginales, base de cúmulos ~1037 m, viento 10 km/h.
base ~1037m · wind 10 km/hComposite flyability score (CAPE + LI + wind + precip + low clouds). Cross-check with local pilots before flying.
Takeoff orientations
Green = good orientation · Yellow = possible · Gray = not suitable
Why this site has thermal potential
| Factor | Value | Interpretation |
|---|---|---|
| Hotspot density (5 km) | 10 | High |
| Avg thermal probability | 0.77 | Based on thousands of aggregated IGC flights |
| Solar orientation | 0.11 | Slope faces south in northern hemisphere |
| Own flight history | 0.00 | Thermals detected in platform IGC tracks |
Takeoff description
alti:1989m From the landing go to 'Saint Pierre de Chartreuse' village and cross it. Take the D102b road to the north ('Saint Pierre d'Entremont' direction) and stop on the 'Cucheron' pass. Walk and follow the sign 'Grand Son' summit during 3h. grass slope just before the summit.
Pilot comments
With little NE wind you can have soaring on the summit, pretty. Beter season: automn (september to november), before snow. You can have good XC from this site, but it's not the spirit if you walk 3h ;-)
Nearby sites
Saint Pierre de Chartreuse - La Scia (70) · Pravouta (72) · Charmant Som (47) · La Dent de Crolles (64) · Col de Baure (48) · Bande (45)