Below 0 degrees it may last for days, or even weeks. Most avalanches occur on slopes between 30-45 degrees. Slopes over 30 degrees should be avoided. Take shovels, probe poles and avalanche beacons and know how to use this equipment. Most avalanches that bury people are triggered by the victims themselves.
Avalanches occur on open slopes, in gullies, and in stands of open trees.
High winds increase avalanche potential. Winds over 15mph can build up soft slab conditions. Winds from 25-50 mph can build up hard slab conditions. If you ski or snowboard at ski resorts, be aware that steep slopes inside the boundary area are controlled with explosives and only open for recreation after they have been stabilized. Do not travel on the same steepness of slope outside the area.