Minnesota winters are long and unforgiving — and the woodchuck knows it better than almost any other animal in the state. While most wildlife simply endures the cold, this stocky little marmot disappears entirely, slipping underground in the fall and not surfacing again until spring arrives in earnest.
If you’ve been wondering when marmots come out of hibernation in Minnesota, you’re in the right place. This guide walks you through the state’s only marmot species, its hibernation timeline, what it does the moment it resurfaces, and where you can go to catch a glimpse of one waking up to a new season.
Which Marmot Species Live in Minnesota
Minnesota is home to exactly one marmot species: the woodchuck (Marmota monax), more commonly known as the groundhog. Minnesota has its own star — the woodchuck, also known as the groundhog, scientifically classified as Marmota monax. These chunky members of the squirrel family roam fields, forest edges, and lakeshores throughout the state.
The groundhog is a rodent of the family Sciuridae, belonging to the group of large ground squirrels known as marmots. The groundhog, being a lowland animal, is exceptional among marmots. Other marmots, such as the yellow-bellied and hoary marmots, live in rocky and mountainous areas. That distinction matters for Minnesota: the state’s flat terrain, farmland, and mixed forest edges are perfectly suited to the woodchuck’s lowland lifestyle — but not to the mountain-dwelling marmots found farther west.
A typical adult woodchuck weighs between 4 and 9 pounds and stretches about 16 to 26 inches long, with a bushy tail that adds a few more inches. Their thick fur, usually a mix of brown and gray, keeps them warm during Minnesota’s harsh winters.
Key Insight: If you’ve ever heard someone in Minnesota refer to a “groundhog,” a “whistle-pig,” or a “woodchuck,” they’re all talking about the same animal — Marmota monax, the state’s sole marmot species.
In Minnesota, woodchucks can be found throughout the state. They inhabit meadows, woodlots, hay fields, pastures, hedgerows, idle fields, parks, and suburbs. Their range is statewide, which means whether you’re in the Twin Cities metro or the farmlands of southern Minnesota, there’s a good chance a woodchuck has a burrow somewhere nearby.
Woodchucks may not get the same attention as loons or deer, but they quietly play a valuable role in Minnesota’s ecosystems. Their extensive burrows help aerate and mix the soil, improving drainage and nutrient cycling. As part of the food chain, woodchucks support predators like coyotes, bobcats, eagles, and owls. You can read more about other hibernating animals that share Minnesota’s landscape, such as when snakes come out in Minnesota, to get a fuller picture of the state’s seasonal wildlife rhythms.
When Do Marmots Hibernate in Minnesota
Woodchucks are one of the truest hibernators in North America — not light sleepers that can be easily roused, but animals that undergo dramatic physiological changes to survive the winter. Woodchucks are one of Minnesota’s true hibernators. The word hibernation tends to be misused. Most of the iconic winter-sleeping animals you think of when you hear “hibernation” are actually in a state of reduced physiological activity called torpor. Bears, for example, fall into that lighter-sleep category — unlike the woodchuck, which commits fully.
In Minnesota, the woodchuck hibernates deeply from the time of the first heavy frost through early spring. It occasionally hibernates in small groups. That typically means woodchucks begin disappearing underground in late September or October, depending on when cold weather arrives.
What happens inside the burrow is remarkable. When the groundhog enters hibernation, there is a drop in body temperature to as low as 35 degrees Fahrenheit (2 °C), heart rate falls to 4–10 beats per minute, and breathing rate falls to one breath every six minutes. During hibernation, its heart rate drops from 100 to four beats per minute, respiration rate slows to one breath every few minutes, and body temperature falls 50 degrees.
Pro Tip: Woodchucks build a separate winter burrow specifically for hibernation. Groundhogs are one of the few species that enter into true hibernation, and often build a separate “winter burrow” for this purpose. This burrow is usually in a wooded or brushy area and is dug below the frost line and remains at a stable temperature well above freezing during the winter months.
To prepare for this long fast, woodchucks spend late summer and early fall eating as much as possible. In early June, woodchucks’ metabolism slows, and while their food intake decreases, their weight increases by as much as 100% as they produce fat deposits to sustain them during hibernation and late winter. Instead of storing food, groundhogs stuff themselves to survive the winter without eating.
Hibernating woodchucks lose as much as half their body weight by February. By the time spring approaches, they are running on the last of their fat reserves — which is part of what drives them to emerge when they do. For a look at how other Minnesota wildlife handles the winter-to-spring transition, see when bears come out of hibernation and how their torpor compares to the woodchuck’s true hibernation.
When Do Marmots Come Out of Hibernation in Minnesota
In Minnesota, woodchucks typically emerge from hibernation in late March to early April. In Minnesota, the creatures are typically called woodchucks. They stay in their burrows until late March or early April, when they can find insects, plants, fruits, and vegetables. The Minnesota DNR’s own conservation publication confirms this, noting that in Minnesota’s woods and towns, they hibernate from fall until spring, and in March they’ll be waking up and moving about.
This timing is later than woodchucks in warmer, more southern states. In most areas, groundhogs hibernate from October to March or April, but in more temperate areas, they may hibernate as little as three months. Groundhogs hibernate longer in northern latitudes than southern latitudes. Minnesota’s position in the upper Midwest means woodchucks here tend to stay underground longer than their counterparts in states like Indiana or Maryland.
The exact date of emergence varies from year to year and from individual to individual. Warmer-than-average springs can pull woodchucks out earlier; a late cold snap can keep them tucked in a bit longer. As often happens, some marmots emerge earlier than others, and many wake up briefly only to return to torpor for some time. Don’t be surprised if you spot one in mid-March on a warm sunny day, only for it to disappear again when temperatures drop.
Important Note: The legend of Groundhog Day is likely due to the fact that woodchucks often re-enter hibernation after emerging from their dens prematurely. In Minnesota, this is especially common — February 2nd is far too early for a woodchuck to stay out for good.
Males are typically the first to emerge. Male woodchucks emerge from hibernation earlier than females in order to establish territories, dominance hierarchies, and to search for mates. Females follow within a few days to a couple of weeks. They emerge from hibernation with some remaining body fat to live on until the warmer spring weather produces abundant plant materials for food.
For comparison, hibernating wildlife in neighboring states follows similar but slightly different patterns — for instance, bears in Maine and bears in Colorado both respond to spring temperature cues, much like Minnesota’s woodchucks do.
What Marmots Do Immediately After Hibernation in Minnesota
The first days above ground after a long winter are busy ones for the woodchuck. Contrary to what you might expect, eating is not the first priority.
Mating comes first. Groundhog mating season begins as soon as the animals wake up in spring. Male groundhogs wake up, emerge, and immediately start looking for female burrows nearby. Spring mating season is one of the few times groundhogs will socialize. Woodchucks usually begin breeding activity during late February or March. Males emerge from hibernation first and travel from burrow to burrow in search of a mate.
The breeding season extends from early March to mid- or late April, after hibernation. After mating, the male moves on — females breed with only one male, but the male does not assist in rearing the young. The gestation period lasts about a month; young are born in early April to mid-May. Woodchucks have only one litter per year that varies from two to nine young, although the average is four.
Then comes eating — a lot of it. Once mating is underway, newly emerged woodchucks turn their attention to food. Shortly after they go looking for mates, newly-awakened groundhogs remember they haven’t eaten for five months. Groundhogs tend to forage and eat more than ever in spring, especially when they’re caring for newborn babies.
Pro Tip: Spring is when woodchucks are most likely to raid gardens. Woodchucks feed on a variety of vegetables, grasses, and legumes, and have the ability to destroy an entire garden or flowerbed in a relatively short time. If you have a vegetable garden, this is the time to check your fencing.
Basking is also common in early spring. Thermoregulatory basking: woodchucks spend time sunning near burrow mouths to warm up after cold nights or after spring emergence. Adults are often seen basking in the sun, in a grassy area, on a fence post, stone wall, large rock, or fallen log — always near their burrow. This behavior helps them regulate body temperature as their metabolism ramps back up after months of near-stillness.
Burrow maintenance begins, too. After a winter underground, woodchucks often refresh their dens — clearing out old nesting material and sometimes digging new tunnels. Woodchucks create separate chambers for sleeping, raising young, hiding from predators, and even using the bathroom. A typical burrow features multiple entrances, including a main front door, a hidden back exit for emergencies, and side tunnels that facilitate ventilation and aid in escape routes.
If you’re curious how other hibernating species handle their spring emergence, bears in Idaho and bears in California also go through a post-hibernation feeding surge that parallels the woodchuck’s spring reawakening.
Where to Spot Marmots in Minnesota
You don’t need to travel far or hike deep into the wilderness to see a woodchuck in Minnesota. These animals thrive in human-altered landscapes and are often easier to spot than people realize — as long as you know where to look.
Field and forest edges are the most reliable habitat. Marmota monax has a wide geographic range and inhabits many different ecosystems. It is typically found in low elevation forests, small woodlots, fields, pastures, and hedgerows. In Minnesota, look along the edges where open farmland meets a woodlot or brushy hedgerow — woodchucks love the combination of open foraging ground and quick cover nearby.
Roadsides and rural highways are another productive location. Forest clearings are suitable habitat for groundhogs. They prefer to live around grassy areas in the country and woods. This is the reason for their being so frequent along the main highways and roads. Driving through rural Minnesota in April or May, keep an eye on the grassy shoulders — a woodchuck standing upright to scan for danger is a common roadside sight.
Suburban and urban green spaces also host woodchucks. The woodchuck inhabits both rural and urban areas. Parks, golf courses, cemeteries, and even residential yards with suitable cover can all support a woodchuck population. Dens are usually found in open fields; near fence rows or woodland edges; under barns, sheds, porches, decks, stone walls, and wood piles.
Key Insight: The best time of day to spot a woodchuck is early morning or late afternoon. Woodchucks are diurnal, and most active in the early morning and evening. Plan your observation time accordingly for the best chance of a sighting.
In spring, look for active burrows as a reliable indicator that woodchucks are present in an area. In the spring, occupied woodchuck burrows are easily recognized. Fresh dirt pellets — ranging from marble size to clods about as big as a fist — are generally found at the mouth of an active burrow.
Minnesota’s southern and central regions, with their mix of agriculture and woodland, tend to have the highest woodchuck densities. The far northern boreal forest areas are less suitable habitat, though woodchucks can still be found in forest clearings and along roads throughout much of the state. For a sense of how wildlife activity patterns shift across different states in spring, it’s worth comparing when snakes come out in North Dakota or when snakes emerge in Ohio — all part of the same seasonal awakening happening across the region.
How to Tell If a Marmot Is Active in Minnesota
Once you know what signs to look for, identifying an active woodchuck territory becomes straightforward. These animals leave behind a clear set of clues both at and around their burrows.
Fresh excavated soil at the burrow entrance is the most obvious sign. The most obvious evidence of woodchuck presence is a mound of soil and stones at the main burrow entrance. There are normally at least two or three entrances. A burrow that’s actively in use will have loose, freshly disturbed dirt — not compacted or overgrown. If the hole is occupied, the dirt on top of the mound will be fresh.
Worn trails between entrances are another reliable indicator. A well-worn trail from entrance to entrance, or to the garden, is a sign of regular activity. Woodchucks are creatures of habit and follow the same routes repeatedly, creating visible paths through grass and low vegetation.
Chewed vegetation and feeding damage near the burrow also signals active use. Evidence of their feeding includes chewed wood and chewing on fresh plants similar to that of rabbits, though it can be difficult to pin on woodchucks without supporting evidence. Look for cleanly clipped grass stems and nibbled plant bases close to the burrow entrance.
Alarm calls are one of the most distinctive signs of a nearby woodchuck. Sounds include occasional sharp whistles and low churrs, given at times of danger. If you hear a sharp, high-pitched whistle from a field edge, there’s a good chance a woodchuck has spotted you first. When marmots detect predators, they are able to communicate the degree of risk to other marmots with their alarm calls.
Common Mistake: Confusing a woodchuck burrow with a badger or fox den. Woodchuck burrows typically measure about 5 to 6 inches in diameter at the entrance and have a characteristic mound of loose soil. Badger dens tend to be wider and more oval-shaped, while fox dens often have a stronger odor and scattered bones or fur nearby.
Basking behavior is a reliable visual confirmation of activity, especially in early spring. When not feeding, woodchucks sometimes bask in the sun during the warmest periods of the day. If you see a stocky, brown animal sitting motionless on a rock, fence post, or log near a field edge, it’s likely a woodchuck warming itself after a cool night.
Flies around a burrow entrance can also indicate occupancy. You will often see flies around an active burrow. While it sounds like an unusual clue, it’s a practical one — the warmth and organic material inside an active den attract insects.
Finally, if you want to observe without disturbing, keep your distance and stay still. Woodchucks rarely travel more than 50 yards from their den, even to feed. That means if you find an active burrow, you’re already within easy viewing range of where the animal spends most of its time. Settle in quietly near a field edge in the early morning, and patience will likely reward you with a close look at one of Minnesota’s most dedicated hibernators — freshly emerged and ready for spring. You can find similar seasonal wildlife observation tips for other species, including when snakes become active in Pennsylvania and when snakes emerge in Oregon, to round out your nature-watching calendar.