Understanding aspect: How to assess the direction of routes and slopes

Aspect describes which compass direction a slope, wall, or section of terrain faces. This information is especially important for mountain routes, via ferratas, alpine routes, ski routes, snowshoe routes, and climbing areas. In climbing areas in particular, depending on their size, you may also find walls with every aspect—south, west, north, and east.

Why aspect matters

Aspect affects sun exposure, shade, snow, ice, and temperature. As a result, a route’s difficulty can change significantly depending on the season and weather.

Examples:

Via ferratas and alpine climbing routes: North- and west-facing walls are often shaded. That can feel pleasant in summer, but in cold and windy conditions it can lead to rapid heat loss.
Climbing areas: In summer, south-facing walls can get extremely hot. Shaded areas are often more comfortable.
Ice climbing: South- and east-facing areas can warm up quickly in direct sun, which can make the ice unstable.
Ski and snowshoe routes: South-facing slopes can become wet more quickly from sun exposure. North-facing slopes stay colder longer and may preserve weak layers in the snowpack.

Also:

Check avalanche conditions. Before any winter route, always read the avalanche forecast and avoid hazardous aspects. Depending on the region, the avalanche forecast may be integrated directly into the Outdooractive map.

Compass rose abbreviations for cardinal directions

N = North
NE = Northeast
E = East
SE = Southeast
S = South
SW = Southwest
W = West
NW = Northwest

How to indicate aspect correctly

Aspect is an important factor when planning mountain and winter routes. It helps you gauge before you start whether a route or area is a good match for current conditions.

If you’re publishing a route yourself, please indicate only the primary aspect in the compass rose. For an alpine climbing route, for example, what matters most is the direction the wall faces—not the approach or descent.