Ben Oss is a munro of 1029m height and is situated six kilometers south-west of Tyndrum. The mountain can be seen from several places within the Loch Lomond and the Trossachs National Park, for example from the north of Loch Lomond. However from some viewpoints Ben Oss gets overshadowed by Ben Lui .The mountain can be recognized by its steep conical peak which is mica-schist rock and most parts of the munro are quite rocky. The mountain is situated on Scotland’s drainage divide. The rainfall of the northern slopes gets drained and as result it forms the headwaters of River Tay. On the other side, the southern rainfall goes through Ben Lomond and then reaches the sea. The smaller neighbour Beinn Dubhchraig as well as Ben Lui are directly connected to Ben Oss which makes it possible to walk routes that combine the three mountains.
The meaning of the name “Ben Oss” is “Loch-outlet hill”. There are two starting points from where climbing Ben Oss is possible. The most popular route starts at the car park at Dalrigh just 1 mile south of Tyndrum (NN 342 291) on the A82. Another starting point is at Allt Fionn Ghlinne and is about three kilometers up Glen Falloch from Inverarnan. Not many people climb Ben Oss from the north and the north-west sides as they are very steep and rough. However, it can be quite interesting to do climbing on the side of the mountain in winter.
Most visitors combine climbing Ben Oss and Beinn Dubhchraig as both mountain peaks are very close together and connected from west to south-west. It is also possible to start climbing Beinn Dubchraig first and walk from there to Ben Oss. Walking this route is quite easy as this route is not as steep as the other ones mentioned above.
Beinn Dubhchraig is 978m high and is the eastern mountain of the mountain group around Ben Lui. Translated this mountain is called “Mountain of the Black Rock”. The north part of Beinn Dubhchraig is grassy and there are some ancient pine trees. In contrast, the south side is rocky. Most visitors who climb Beinn Dubhchraig start from the bridge over the River Fillan situated near Dailrigh. The same route can be used as a skiing route in winter. The map above shows the summit of Ben Oss and the starting point recommended to climb Ben Oss and Beinn Dubhcraig.
Ben Oss and Beinn Dubhchraig are situated nearby Tyndrum Village. The popular West Highland Way passes through the this village. Also nearby is Crianlarich which has 2 train stations, but apart from this is a very tranquil village. The mountains together with Ben Lui and the Glen of Cononish make up the Ben Lui Nature Reserve. It is an interesting place for biologists study the mountain plants which grow on the rocks. The lower paths of the mountain group have some beautiful woodland with pine and birch trees. The northern part has remnants of the Scots Pine, a former Caledonian Forest. Higher up it is possible to spot deer.
There are buses from Glasgow to Oban and Fort William which also stop in Crianlarich and Tyndrum. Around Crianlarich. Travelling by car from Glasgow is possible by driving first to Dumbarton and then following the A82 until Crianlarich or Tyndrum.