Hoary Marmot: where and when to see them

The hoary marmot is a large mountain squirrel named for the frosted appearance of its pale shoulder and upper-back fur. In Alaska it inhabits mountainous terrain rather than ordinary shoreline habitat. Colonies depend on a close combination of feeding meadows and secure rocky shelter. Its short active season is dominated by feeding and reproduction before a long winter underground, making access and lingering snow central considerations for land-based observers.

Size

60-80 cm long including tail

Weight

3-8 kg

Lifespan

Not reliably established

Status

Least Concern

Hoary marmots live in social groups and alternate feeding with vigilance from rocks or other elevated positions. Their piercing alarm whistles alert nearby animals to possible danger. Individuals sun themselves, groom and interact around burrow systems, but retreat quickly when threatened. They accumulate substantial fat reserves during summer and hibernate communally for much of the year, with the length of dormancy influenced by local mountain conditions. Marmots maintain their fur through regular grooming, which is important for insulation and parasite control. They hibernate in burrows, often communal, for seven to eight months of the year, relying on fat reserves built during the short summer.

• The name hoary refers to its silver-frosted fur.
• It belongs to the squirrel family.
• Its alarm calls have earned marmots the nickname whistle pigs.
• Body mass changes markedly as summer fat reserves accumulate.

June through August is the most practical general window for accessible mountain trails and active marmots in Alaska. Snowmelt and elevation can delay access well into summer. Early autumn observations are possible locally, but animals soon become less available as hibernation approaches. In higher elevations, lingering snow can block trails well into July, requiring careful planning for excursions. Observing active marmots in early June might require accessing lower, sunnier slopes where snow has receded sooner.

They occupy alpine and subalpine meadows beside talus slopes, boulder fields and rocky outcrops. Burrows beneath rocks provide escape cover and winter shelter. Coastal mountains can support them, but seeing one generally requires an uphill inland excursion rather than a shoreline walk. They are found at elevations between 3,000 and 6,000 feet, often extending higher depending on snowpack and vegetation. Their burrow systems can be extensive, offering protection from predators and extreme weather.

Hoary marmots primarily eat grasses, sedges, flowering herbs and other alpine plants. They select fresh growth as snow recedes and change feeding areas as vegetation develops. Summer food intake builds the fat reserves needed to survive months without feeding during hibernation. They occasionally supplement their plant-based diet with insects, bird eggs, or carrion, especially during periods of high energy demand. Water is obtained primarily from the plants they consume and melting snow, as they rarely drink directly.

Common name

Hoary Marmot

Scientific name

Marmota caligata

Animal group

Mammals

Size

60-80 cm long including tail

Weight

3-8 kg

Lifespan

Not reliably established

Status

Least Concern

Identification

The large body, dark feet and grizzled pale shoulders distinguish hoary marmots from the smaller, more evenly brown ground squirrels often sharing mountain landscapes. Their scientific name, Marmota caligata, refers to their 'booted' appearance due to the dark fur on their legs and feet. The grizzled fur is a mix of black, white, and brown hairs, giving them their 'hoary' or frosty appearance.