Arrival by car: Coming from Hermagor or Kötschach-Mauthen, drive along the B111 (Gailtal Road) towards Tröpolach/Nassfeld junction - from there, continue on the B90 (Nassfeldpass Road) up to Sonnenalpe Nassfeld or the border crossing (Austria/Italy).
Public transport:
The most sustainable way to travel is by train (coming from Villach) to Hermagor. From Hermagor, you can continue by bus to the town of Tröpolach.
Alternatively, there is also the option to arrive by bus from Kötschach-Mauthen or Villach to Hermagor or Tröpolach.
From Tröpolach, there are now two options - either you take the Almshuttle (phone registration necessary) - continuing to the state border,
or - take the Millennium Express from Tröpolach to the Kofelcenter (mountain station) and then descend with the chairlift of the Madritschenbahn, to reach the starting point of the Geotrail at the Nassfeldpass state border after a 10-minute walk.
More details at - Mobility Information Nassfeld and Route Planner Kärntner Linien