Map 19 – Caledon Hills – Third Outlier Side Trail

Date Effective: Jun. 16, 2025 | Map 19, Edition 31

A new side trail has been blazed on the BTC’s Whitetail Refuge Nature Reserve (secured in 2022).

Third Outlier Side Trail is a 390 metre trail connecting the main Bruce Trail and the Whitetail Refuge Side Trail, creating a 1.6 km loop, and traversing the face of a unique geological formation – an outlier.

Near the village of Mono Centre, there are three outliers – large “islands” of Escarpment rock, separated from the main Escarpment edge. Two of them are located within Mono Cliffs Provincial Park. The third one is partly contained within the BTC’s Whitetail Refuge Nature Reserve.

Leaving the main Bruce Trail, this side trail descends through a gap in the Escarpment edge and cuts diagonally across the north face of the third outlier. Colonies of Walking Fern can be seen on top of some of the large boulders near the beginning of the trail. After 390 m, it intersects the Whitetail Refuge Side Trail.

The upper portion of the Third Outlier Side Trail is of above-average technical difficulty; hikers should watch carefully for crevices among the boulders.