Avalanches are more likely to occur above tree line where there is more exposure to the sun, wind loading, and less terrain features to hold the snow in place. However, avalanches can and do happen below tree line. Do not make the mistake of thinking just because you're in the trees you're safe.

Where do avalanches occur most often?

About 90% of all avalanches begin on slopes of 30-45 degrees, and about 98% occur on slopes of 25-50 degrees. Avalanches strike most often on slopes above timberline that face away from prevailing winds (leeward slopes tend to collect snow blowing from the windward sides of ridges).

Do trees stop avalanches?

ANCHORAGE, Alaska (Reuters) - Skiers and snowboarders who believe they are protected from avalanches when they schuss through tree glades could be making a grave mistake, a snow-safety expert said.