A fine local example is the slump at the intersection of highway 93 and U.S. 6 in Golden. They are now building houses on top of the slump. Creep is the undetectably slow movement of unconsolidated soils downslope. It is commonly seen as curved tree trunks as in the above phote. Important to look for when buying real estate but not life-threatening.
Avalanches are the mass wasting of the snowpack and are a particular hazard here in Colorado.
Most occur within the first 24 hours after a major snowfall. Any slope steeper than 30 degrees can slide. Powder sloughs are most common. Slab avalanches are very dangerous and occur when the entire snowpack slides.