It is a hill that is frequently traversed by walkers along its ridge but is seldom climbed as the sole objective.

[citation needed] Allen Crags is situated at the southern end of a 6 kilometres (4 mi) long north-south ridge that starts at Stonethwaite in Borrowdale and concludes at the strategically important mountain pass of Esk Hause.

The summit rocks comprise the laminated volcaniclastic claystones and siltstones of the Esk Pike Formation.

The majority of the ridge displays the underlying dacitic welded lapilli tuff of the Lincomb Tarns Formation.

[1] As mentioned Allen Crags is quite often approached along its northern ridge from Glaramara and this is the most popular ascent of the fell.