Château de Clermont

Château de Clermont is a ruined medieval fortress in Chirens, in the Isère department of the Auvergne-Rhône-Alpes region. Locals often call it the "Tour de Clermont," a name that reflects what actually survives on site: a single medieval tower.

What's the story behind these ruins?

The site's first structure dates to the 11th century, when a simple wooden tower stood on a motte castrale — a raised earthwork typical of early medieval defensive building in the area. From the 12th century, the land belonged to the Clermont-Tonnerre family, who rebuilt the wooden tower in stone, turning the site into a proper fortress with the tower serving as its keep. For centuries the stronghold guarded a border position, but its military role ended with the Wars of Religion: around 1626–1633, the fortress was deliberately dismantled under an order inspired by Cardinal Richelieu, part of his broader campaign to strip the French nobility of independent fortified strongholds. The land has stayed in the hands of the same family, Clermont-Tonnerre, ever since — though today it preserves only the memory of that former stronghold.

What will you actually see?

Of the original defensive complex — which once included a triple enclosure and a wide lower courtyard — only the keep remains standing. It's a pentagonal tower roughly 22 metres in perimeter and 27 metres tall, built from dressed stone with visible rustication. The tower originally had four floors; the third served as the lord's residence, and traces of that domestic comfort are still visible today, including a wall fireplace and latrines. The ruins sit partly hidden within woodland, which gives the site a genuine sense of stumbling upon forgotten history.

How do you get there?

The ruins are reached on foot from the small hamlet of Clermont, a walk of about 10 minutes along a pleasant but poorly marked path. It makes a good short detour if you're already spending time near Lac de Paladru, which lies close by. Sturdy footwear is recommended, since the ground is uneven and partly wooded.

When is the best time to visit?

Visits are free and self-guided, with no fixed opening hours, so daylight hours are the practical window — visibility in the wooded surroundings is best when it's light out. Spring and autumn are the most comfortable seasons for the walk, offering mild temperatures and fewer insects than summer. The site has been listed as a monument historique since 1983, confirming its recognised heritage value.

Who is this destination for?

Château de Clermont appeals to medieval history enthusiasts, photographers hunting for atmospheric ruins, and anyone looking for a quiet walk around the Lac de Paladru area. This isn't a restored castle with visitor facilities — it's an authentic ruin, suited to travellers who prefer a direct encounter with history over a polished tourist attraction.

Frequently Asked Questions

Is there an entrance fee? No, the ruins are free to visit and explored independently, without a guide.

How long is the walk to the castle? About 10 minutes on foot from the hamlet of Clermont, along a forest path.

What exactly survives from the original castle? Only the pentagonal keep, standing 27 metres tall — the rest of the fortress was destroyed in the 17th century.

Is there anything else worth seeing nearby? Yes, Lac de Paladru is close by and popular with visitors exploring the Pays Voironnais region.