Follow Acland Falls Track from Te Wanahu Flat and turn left onto Allans Track after about 500 metres. Allans Track then joins Deer Spur before dropping steeply to Fern Walk, which can be followed back to the starting point. This track passes through a range of botanical communities from the tall podocarp forest near the valley floor to the subalpine and alpine vegetation on the higher slopes. The track is named after H H B Allan (1882–1957), a pioneer botanist best known for his Volume One of the Flora of New Zealand. In 1924 he wrote a book on the vegetation of Mt Peel Forest.
From Geraldine town centre, take SH79 north out of town and over the Orari River Bridge. Keep left as you come off the bridge and follow along the Inland Route 72 for 3kms before turning left onto Peel Forest Road. Stay on Peel Forest for approximately 14 kilometres until you reach Te Wanahu Flat.