Ice Glen is a narrow rocky ravine just south of the Stockbridge village centre, carved through a hillside by glacial action and so deeply shaded that temperatures at the bottom remain near freezing well into early summer. The trail through it involves some scrambling over large boulders and fallen logs — it is not a maintained path, just a route through the chaos of a glacially churned landscape.
The ravine takes about 20 minutes to walk through and exits onto the adjacent hillside, from which a short loop returns to the trailhead near the river. It is particularly striking in early spring when ferns are unfurling and the ice is still in the crevices, or in autumn when the steep walls are draped in colour. This is one of the more genuinely dramatic natural features in the Berkshires and is almost entirely unvisited relative to the nearby museums and estates.