Traveling across steep slopes should be done cautiously, without spending too much time on them. Although avalanches can occur on any slope, given the right conditions, certain times of the year and certain locations are naturally more dangerous than others. Most avalanches occur between December and April, although avalanche fatalities have been recorded during every month of the year in Colorado. The highest number of fatalities occur in January, February and March, when the snowfall amounts are highest in most mountain areas. A significant number of deaths occur in May and June, demonstrating the hidden danger behind spring snows and the melting season that catches many recreationists off-guard.
Avalanches are most likely to occur either during or immediately following a significant snowfall.
The 24 hours following a heavy snowstorm are the most critical. Temperature, wind and snowfall during storms can create fatal avalanche conditions. Most avalanches occur on slopes between 30 degrees and 45 degrees, but can occur on any slope angle given the right conditions. Very wet snow is well lubricated with water, meaning it can run on a slope of only 10 to 25 degrees. Compacted, well bonded layers of snow can cling to steeper slopes until a weak layer is created.