The fell is always climbed from the Patterdale valley, with no other starting point being viable. The ascent is a pleasant walk through the wooded Glenamara Park along a footpath which leaves Patterdale and follows Hag Beck and then a ruined dry stone wall to the summit. An alternative route goes via Thornhow End and finds a way through Black Crags at attain the top of the fell. Most walkers who climb Birks will continue on to St Sunday Crag which is a comfortable climb of about 240 metres with a few small dips on the ridge.