A Massive Avalanche Swept a Popular Banff Ice Climb. It Wasn’t the First Time.

An avalanche ran down the slopes of Mount Rundle above Banff on the morning of March 21, 2026, crossing a well-known ice climbing route that is visible from the Trans-Canada Highway.

The slide moved through Professor Falls, a frequently climbed waterfall ice route that follows a defined avalanche path on the mountain’s north-facing slopes.

“Nobody was involved in this avalanche,” Parks Canada’s Mountain Safety team wrote in a public report, noting that the event was photographed from across the valley.

When staff returned to the route in April to assess conditions, they found that the character of the climb had changed substantially above the lower pitches.

“In some places, we estimated the debris to be 25 metres deep,” the report said. “All of the ice is buried except for the last pitch.”

Based on field observations and scenario modelling, the avalanche was classified as a Size 4. This category refers to avalanches capable of damaging large infrastructure and typically involves volumes exceeding 25,000 cubic metres.

“Avalanches like this don’t happen very often,” the Mountain Safety team wrote, “so it’s always interesting to study them closely and see what we can learn, especially when they occur in popular recreational areas.”

A Known Avalanche Path

The route sits within what Avalanche Canada describes as the Professor avalanche path, with multiple start zones located high above the climb. While the route is commonly climbed in winter, it lies beneath terrain capable of producing long-running avalanches.

Survey data compiled by Avalanche Canada indicates that most climbers who have completed the route have encountered avalanche debris at some point. Observations range from debris in the upper pitches to reports of material reaching the base of the climb and, in some cases, the river.

Avalanches have been documented across the full length of the route in past seasons.

In a 2005 incident, a Size 3 avalanche descended through the same path while climbers were on route. They avoided being buried by moving to the margins of the gully as debris passed by, accumulating to depths of more than 10 metres in places.

Conditions Following the March Avalanche

Climbers who visited the route in early April reported similar findings to those described by Parks Canada.

Lower pitches remained climbable, though affected by seasonal melt and changing ice structure. Above that, debris had accumulated in significant volumes, covering multiple sections of the route.

“The debris has completely buried the shorter steep pitch of ice, and the 30-metre pitch above that,” one climber wrote. “Along with any other sign of ice.”

Parks Canada’s assessment reached a similar conclusion, noting that only a short section of ice remained visible near the top of the climb.

Visibility and Timing

Professor Falls is visible from Highway 1, making it one of the more recognizable ice climbs in the Bow Valley. For many, it is observed from a distance rather than experienced directly.

Avalanche Canada data suggests that while many avalanches on this route occur in the afternoon, often associated with warming temperatures, they can also occur earlier in the day. The March 21 event took place at approximately 7:30 a.m.

Start zones for these avalanches are typically located well above the climb, which can make hazard assessment from within the route more difficult.

The lower portions of the climb are stepped and can offer partial protection from overhead exposure. The upper sections are more continuous and tend to accumulate more debris.

A Consistent Pattern

The March avalanche stands out for its size classification and the depth of debris observed on the route.

At the same time, it aligns with a broader pattern associated with the terrain.

Ice climbs in the Bow Valley often form beneath avalanche paths. Under certain conditions, those paths will produce avalanches that travel through or across the climb.

For Parks Canada’s Mountain Safety team, events like this provide an opportunity to better understand how those processes unfold.

“Avalanches like this don’t happen very often,” they wrote, “so it’s always interesting to study them closely.”

For those familiar with the route, the event reflects a known characteristic of the terrain rather than an unexpected one.