Sulphur Mountain, Mountain peak in Banff National Park, Canada

Sulphur Mountain is a grey rock summit in Banff National Park, Alberta, rising to 2,451 m (8,041 ft) above the town of Banff. Coniferous forest covers its lower slopes and climbs in a strip up the rocky face. A zigzagging path with stair sections and a small building is built into the left side of the upper slope, and a small tower stands on the peak.

The mountain was named in 1916 after natural hot springs that early explorers found along its lower slopes. These sulphur springs drew attention to the area and established its identity.

The mountain's name comes from the hot springs on its lower slopes, noted when the peak was renamed in 1916; George Dawson had called it Terrace Mountain on his 1886 map. The Nakoda name is Mînî Rhuwîn. At the summit, a boardwalk leads to Sanson's Peak, named in 1948 for Norman Bethune Sanson, who recorded observations there for nearly 30 years.

You can reach the summit by riding the Banff Gondola or hiking one of the trails starting from the Banff Hot Springs parking area. Both options offer different ways to experience the mountain depending on your time and energy.

An old meteorological observatory stood at Sanson Peak, where Norman Bethune Sanson monitored scientific instruments for thirty years. Research on cosmic rays continued there until 1978, making it a forgotten piece of scientific history.