An Caisteal and Beinn a’ Chròin Circuit

An Caisteal and Beinn a’ Chròin Circuit is an 8.75-mile (14 km) loop from the A82, taking in two Munros before returning east along the River Falloch. Plan for 5.5–7 hours and about 1,045 m of ascent; this is a full hill day for confident walkers who are comfortable navigating faint paths. The line climbs An Caisteal first, follows the high ridge to Beinn a’ Chròin, crosses its eastern top, then drops down a grassy ridge and returns along the river. The distance includes the whole circuit back to the layby, not just the ridge between summits. There is a choice to retrace over both tops after Beinn a’ Chròin; this description follows the eastern circuit and does not extend south to Beinn Chabhair.

From the layby, a short path runs under the railway and across the River Falloch on a bridge. Continue gently uphill on the rough track through a gate; after roughly 1 km, turn right onto the path that climbs beside a burn. The start of the climb is boggy, then it becomes straightforward grass with a couple of short rocky steeps. Relict Caledonian pine clings to the broken slopes of Glen Falloch, a distinctive landmark below the ridge. Route-finding gets harder before Sròn Gharbh, where the path is faint, then clearer along the meandering Twistin Hill ridge. Rockier patches and a deep cleft with a couple of steep steps make the last stretch to An Caisteal feel like mountain ground rather than a pathside stroll.

Drop south from An Caisteal on the clearer crest and rocky steps to Bealach Buidhe. From the bealach, traverse southeast up the steep buttress of Beinn a’ Chròin. There is a short scramble, with an awkward detour to the right if you want to avoid it; the top ridge itself is broad, not a narrow arête. Above the buttress, the route picks between rocky hummocks and tiny lochans to a small cairn at the true high point, 942 m. Continue over a final dip to the eastern top; do not turn down early, because the circuit descent joins shortly before that smaller cairn. On a phone panorama, keep a little of the ridge in the foreground: it connects the two summits in the frame. Views from here sweep east and north over the Trossachs.

From the eastern top, go north briefly on your ascent path, then continue straight down the grassy ridge. The path is faint for much of this descent and eroded on steep ground. Aim for the meeting of two streams and cross them just before the confluence; then follow the path along the west bank of the River Falloch, past clear pools and the hydro works, to a hydro track. It brings you back to your outward route for the bridge, railway underpass, and layby. The route crosses Glenfalloch Estate land, where deer stalking runs from late August to October 20; this ridge line avoids the corrie floors. Check current estate instructions before setting out. Access is the A82 layby at NN369239, about 4 km south of Crianlarich.