Ofenloch

Ofenloch is a rugged gorge and grotto in the Toggenburg region of canton St. Gallen, in the Nesslau area close to the Schwägalp pass. Locals call it the "Grand Canyon of Eastern Switzerland", and for hikers it is one of the wildest corners between the Necker valley and the Toggenburg.

What is Ofenloch?

The name literally means "oven hole". The site combines a deeply cut gorge with a grotto, carved into the slopes that separate the Toggenburg from the Necker valley. The Necker river rises in this area and runs about 30 km before joining the Thur near Lütisburg, making this its wild upper reach.

How do you get to Ofenloch?

There is no road access. You walk in on a mountain trail from one of three typical starting points:

• Schwägalp (bus stop Schwägalp Passhöhe), the most popular start,
• Ennetbühl, the usual end of the through-route,
• Hemberg, a variant approaching from the north.

The classic route runs Schwägalp, Chräzerenpass, Ofenloch, Hinterfallenkopf and Ennetbühl (trail 948). Hiking portals give roughly 14 to 15 km and 4.5 to 5 hours, with around 650 to 720 m of ascent. Buses serve both Schwägalp and Ennetbühl, so the hike works without a car.

How hard is the hike?

It is demanding. The Ofenloch section is rated T3 on the Swiss mountain-trail scale: you need sure footing and a head for heights, and some stretches are secured with ropes. Technically it is medium, but it is physically tough, especially with about 1,200 m of descent. The trail can be closed or interrupted depending on season and weather, so check conditions with local tourist information before setting out.

When should you go?

The season runs roughly from April to October. Choose dry days after the snow has melted: wet rock and a soggy path in the gorge raise the risk of slipping. Start in the morning so you have a buffer for the last bus from Ennetbühl.

What else is nearby?

Nesslau sits in the upper Toggenburg beneath the Churfirsten, and Schwägalp is the gateway to the Säntis massif. The region also has caves, such as the Wildenmannlisloch on the north flank of the Selun (about 192 m long, bring a torch). These are separate outings, away from the Ofenloch route.

Frequently asked questions

Is Ofenloch suitable for beginners? No. The route is graded T3, long and partly exposed, so it calls for mountain experience.

How long does Schwägalp to Ennetbühl take? About 4.5 to 5 hours over 14 to 15 km.

Do I need a guide? No, the trail is waymarked. Still, check the current trail status and the forecast.

How do I get there without a car? Take local buses to Schwägalp Passhöhe, or approach from Ennetbühl or Hemberg.