The Château d'Herbelon welcomes seminars, retreats, artistic residencies and group events in Treffort, in the Isère Alps. The castle stands on the shore of Lake Monteynard. Its rooms can be used separately or together, from three 60 m² salons to a 220 m² vaulted cellar, and stays run from a few days to several weeks.
Seminars and company events
The château receives professional seminars and working groups that want calm, space and a setting away from standard conference hotels. The three salons of 60 m² each suit seminars, meetings, collective work sessions or meals. A separate 60 m² activity room has a direct view of the lake and an old wooden floor. The venue suggests it for workshops, writing, meditation, yoga or smaller seminars.
For larger gatherings, the vaulted cellars cover 220 m². The venue describes the volume as suited to conferences, performances, evenings and cultural events. Outside, the wooded park of 3,000 m² has direct access to the lake, so work sessions can alternate with walks or time on the water without leaving the site.
The team does not sell a fixed package. Each project is discussed first, then the château proposes a configuration that fits the format and the group.
Weddings and receptions
The official site presents the château as open for professional and private events, including receptions. It gives no wedding-specific offer, capacity or layout, so couples should ask the team directly what is possible.
Rooms and capacities
The site lists these spaces: the activity room (60 m², lake view), the three salons (60 m² each), the vaulted cellars (220 m²), a sheltered terrace that seats up to 40 for a meal, and the 3,000 m² wooded park. It does not publish seated or standing capacities for the indoor rooms, so confirm the numbers for your layout when you send a request.
Accommodation
The château runs as a hotel with coliving and coworking space. Hotel and restaurant stays are paused for the winter, and bookings for 2027 stays open on December 1. During this period the château remains open for events. The site does not state the number of bedrooms, so ask for the current count and for the rooms available to your group.
Catering
The château has a restaurant and bar. A new chef, Clément Mouret, takes over the kitchen for the 2027 season. Whether the kitchen caters off-season events, or whether an outside caterer is allowed, is not stated on the site.
History and setting
The building is a former fortress that has stood for more than 400 years. It overlooks Lake Monteynard, between mountains and water. In summer the shore fills with wing foil, kitesurf and hiking, which gives groups activities close to the château.
Getting there
The address is 1605 route d'Herbelon, 38650 Treffort. The site does not give station or airport details, so check access with the team when planning transport for a group.
