Marmota caligata Distribution. From the Cascade and northern Rocky Mts. to Alaska. Hoary marmot social organization varies geographically. In Alaska they live in monogamous social groups consisting of a pair of adults and pre-reproductive offspring.
Hoary marmots are active about four and a half months each year.
When females reproduce, litter size averages three pups. Like their close relatives, the Olympic marmot , they have four alarm calls. Hoary marmot calls can be similarly described by the difference between the starting and ending frequencies. Calls may be ascending , descending , or relatively flat . Hoary marmots also trill.