Along the Oak Ridges Moraine. It is best known for its steep terrain, forested ravines, and the famous “99 Steps” wooden staircase that descends sharply into a deep valley. The area is part of a protected natural and scientific landscape and offers a challenging but rewarding hiking experience through mature forests, rolling hills, and wildlife habitats.

Best Features
- Famous “99 Steps” steep staircase descent
- Dramatic elevation changes through Oak Ridges Moraine terrain
- Dense forest trails with ravines and natural viewpoints
- Peaceful wildlife habitat with deer and bird sightings
- Connection to Jokers Hill / Koffler Scientific Reserve trails

Why it’s popular
Thornton Bales is popular because it offers one of the most physically challenging and scenic hiking experiences near the GTA, with steep climbs, quiet forest sections, and a unique stair descent that makes it feel like a hidden wilderness escape close to the city.
It is especially loved by hikers looking for elevation and a more “real hike” experience compared to flatter local trails.