Nebraska may not be the first place that comes to mind when you think of marmots, but these stocky, burrowing rodents are very much a part of the state’s wildlife story. In fact, the species most commonly found here has been quietly spreading westward across the state for decades.
If you’ve noticed a large, chunky ground squirrel near a field edge or under a shed and wondered what it was — and when it might show up again after winter — you’re in the right place. This guide walks you through everything you need to know about marmots in Nebraska, from which species call the state home to when they emerge from their winter burrows each spring.
Which Marmot Species Live in Nebraska
Within the marmot family there are 15 unique species, and all groundhogs are marmots — though not all marmots are groundhogs. In Nebraska, the species you’re most likely to encounter is the groundhog, also known as the woodchuck (Marmota monax).
The woodchuck, or groundhog, is one of the most common mammals in eastern Nebraska, but is still improperly identified by many people as a gopher or a beaver. Some people who do recognize the woodchuck realize this rodent is a member of the same family as the squirrel and the marmots.
Woodchucks have been advancing westward across Nebraska toward almost Colorado, where the related cousin, the yellow-bellied marmot, resides at high elevations in the Rocky Mountains. Yellow-bellied marmots are native to the mountainous region of the western U.S., while groundhogs usually live east of the Rocky Mountains. This means the yellow-bellied marmot is not a Nebraska resident — it simply does not have suitable habitat here.
Key Insight: Nebraska has one marmot species: the groundhog (woodchuck). The yellow-bellied marmot, its western cousin, lives in the Rocky Mountains and does not reach Nebraska’s terrain.
The groundhog is exceptional among marmots because it is a lowland animal, while other marmots, such as the yellow-bellied and hoary marmots, live in rocky and mountainous areas. That lowland adaptability is precisely what allows it to thrive across Nebraska’s mix of fields, river corridors, and woodland edges.
Visually, groundhogs look distinct with their coarse, reddish-brown to gray fur and dark brown or black legs. Adults may measure from 41.8 to 68.5 cm (about 16–27 inches) in total length, and weights typically fall between 2 and 6.3 kg (about 4–14 pounds).
When Do Marmots Hibernate in Nebraska
Groundhogs are true hibernators, unlike bears or raccoons that simply sleep lightly through the cold months. Their physiological shutdown is one of the most dramatic in the animal kingdom.
Marmots and woodchucks are true hibernators, as opposed to bears, raccoons and other winter sleepers that snooze deeply but sometimes awaken and occasionally venture out. Woodchucks doze from late September or early October through late February or early March.
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, they experience periods of torpor and arousal, and hibernating woodchucks lose as much as half their body weight by February.
Important Note: Groundhogs do not store food for winter. They survive entirely on fat reserves built up during late summer and early fall, making those pre-hibernation feeding months critical to their survival.
In late August and September, woodchucks have voracious appetites as they prepare to hibernate. This deep sleep, when body temperatures drop and heart rate slows to four beats per minute, usually begins in October and continues through February.
Woodchucks often construct two types of dens: winter dens and summer dens. Winter dens are usually located within wooded or brushy areas and serve as hibernation chambers. These dens typically have one opening, with the hibernation chamber situated below a tree or stump for protection against intruders.
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. Nebraska’s continental climate, with cold winters and variable spring timing, means most groundhogs here are underground for roughly five to six months.
When Do Marmots Come Out of Hibernation in Nebraska
This is the question most Nebraska nature-watchers are curious about, and the answer depends partly on where in the state you are and what the weather has been doing. The emergence of the groundhog from its hibernation burrow in early spring is the basis of the “Groundhog Day” observance on February 2. The actual day of emergence varies with conditions and latitude; in the northern parts of the animal’s range, which includes Nebraska, it usually emerges in March.
Groundhogs emerge when soil temperatures rise and the upper layers begin to thaw. In many northeastern states, this occurs in late February or March, depending on local conditions. In Nebraska, late February is possible during mild winters in the southeast, but March is the more typical window statewide.
| Region of Nebraska | Typical Emergence Window | Key Driver |
|---|---|---|
| Southeast (Omaha, Lincoln area) | Late February – early March | Warmer winters, urban heat |
| Central (Kearney, Grand Island) | Early to mid-March | Soil thaw, daylight increase |
| Western (North Platte, Ogallala) | Mid to late March | Colder, later-thawing soils |
Daylight and soil warmth prompt groundhogs to emerge from hibernation. The timing of groundhog emergence depends more on soil warmth and daylight than on whether the animal sees its shadow. The famous Groundhog Day tradition, while fun, does not reflect the real biology driving emergence.
Pro Tip: Watch for the first consistent daytime temperatures above 40–45°F in your area. That warming trend, combined with lengthening days, is what actually triggers groundhogs to stir from their winter dens.
Groundhogs emerge from hibernation with some remaining body fat to live on until the warmer spring weather produces abundant plant materials for food. Early emergers may be above ground briefly before retreating again if cold snaps return, so a single sighting in late February does not mean the animal is fully active for the season.
What Marmots Do Immediately After Hibernation in Nebraska
The first days and weeks after a groundhog emerges are a busy and vulnerable time. They mate during March, shortly after emergence. Males often leave their winter dens before females, moving through the landscape in search of mates — a behavior that makes them more visible to observers in early spring.
Woodchucks breed in late February or March and usually not until the animal is close to two years old. The gestation period is 31–32 days, and four to five young are born in April or May.
Feeding is the other urgent priority. Hibernating woodchucks lose as much as half their body weight by February, and they emerge from hibernation with some remaining body fat to live on until the warmer spring weather produces abundant plant materials for food. Once vegetation begins to green up, they shift into an intensive feeding mode.
Pro Tip: Newly emerged groundhogs are drawn to the first green shoots of spring — dandelions, clover, and early grasses. If your yard or garden is producing these, expect a groundhog to notice.
After breeding, the winter den is abandoned by the woodchuck several weeks after they emerge from hibernation, and the animals then move into nearby grass or crop fields and construct their summer dens. This den transition is a good sign that the animal has settled into its full active-season routine.
Young stray from the burrow alone at 6–7 weeks, mid-June to early July, and the mother drives young from her burrow by July. By midsummer, the family unit disperses and each animal begins building up fat reserves for the next hibernation cycle.
You can read more about how other hibernating mammals emerge in spring to get a broader picture of how this seasonal rhythm plays out across different species and regions.
Where to Spot Marmots in Nebraska
Knowing when groundhogs emerge is only half the picture — knowing where to look makes all the difference. Groundhogs, whistle pigs, or woodchucks are all synonymous with a large squirrel commonly active during the day and seen frequently on the edges of woodlots, rivers, streams, fields, and even in backyards across eastern parts of the United States.
In Nebraska, woodchucks can be found across the state and are becoming more common in urban areas. Their range has expanded dramatically in recent decades. In the 1960s, woodchucks lived in only the eastern quarter of the state, not much farther west than York. However, by the late 1990s and early 2000s, woodchucks reached central parts of the state.
In 2018, students and colleagues at the University of Nebraska at Kearney, with assistance from many private residents and Nebraska Game and Parks Commission officers and wildlife biologists, updated the whereabouts of woodchucks across Nebraska and found that woodchucks are now as far west as Ogallala in Keith County and are quite common throughout all of central Nebraska.
The reason for this westward march comes down to habitat change. Large-scale changes to prairie rivers, changes to grassland ecosystems, and tree plantings associated with cities, towns, farms, ranches, and shelterbelts have all greatly increased trees statewide. Since the early 1980s, forested areas have increased across the state.
Key Insight: Nebraska’s groundhog population has expanded westward at roughly 6 miles per year since 2000, following the Platte River corridor and the growth of shelterbelts and woody vegetation across the state.
In terms of specific habitat, woodchucks favor meadows, woodlots, hay fields, pastures, hedgerows, and idle fields, with dens usually found in open fields near fence rows or woodland edges, and under barns, sheds, porches, decks, stone walls, and wood piles.
For the best viewing opportunities, focus on:
- Field edges along the Platte River corridor
- Fence lines and hedgerows in eastern and central Nebraska
- Grassy roadsides near wooded shelter belts
- Suburban yards and parks in the Omaha and Lincoln metro areas
- Farmstead edges with outbuildings and brush piles
If you’re also interested in other wildlife emerging in spring, check out when snakes come out in Nebraska — another seasonal event that often overlaps with groundhog activity.
How to Tell If a Marmot Is Active in Nebraska
You don’t always need to see the animal itself to know a groundhog is up and about. There are several reliable signs that a woodchuck has emerged from hibernation and is actively using a burrow in your area.
Burrow entrance signs
You will see a large mound of dirt and stones by the main entrance to their burrow; the secondary entrances, which were dug from the inside, generally don’t have a dirt mound by their opening. Fresh digging and loose soil around an entrance are strong indicators of recent activity.
You will often see flies around an active burrow. A well-worn trail from entrance to entrance, or to a garden, is another telltale sign.
Behavioral signs above ground
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 sunning behavior is especially common in early spring when groundhogs are warming up after months underground.
This sun-loving creature is active by day, especially in early morning and late afternoon. If you want the best chance of spotting one, those are the hours to be watching.
Pro Tip: Stand quietly near a suspected burrow entrance around dawn or an hour before sunset. Groundhogs are cautious but predictable — they’ll often pause at the burrow entrance and look around before venturing out to feed.
Sound
Occasional sharp whistles and low churrs are given at times of danger. If you hear a loud, sharp whistle from a field edge and can’t immediately spot the source, a groundhog has likely detected you before you detected it.
Feeding evidence
The woodchuck is almost a complete vegetarian, eating leaves, flowers, and soft stems of various grasses, of field crops such as clover and alfalfa, and of many kinds of wild herbs. Clipped or chewed vegetation near a burrow entrance — especially early green growth like clover and dandelion — is a clear sign of active feeding.
Once you’ve confirmed a groundhog is active, you can also watch for the seasonal transition from winter to summer behavior. The winter den is abandoned several weeks after emergence, and the animals then move into nearby grass or crop fields and construct their summer dens. Noticing a new burrow opening in a grassy area in April or May often means a groundhog has completed its post-hibernation transition and is fully settled into its warm-season territory.
For more on how hibernating animals across the region follow this same seasonal rhythm, see how bears emerge in Massachusetts, bears emerge in Maryland, and bears emerge in Connecticut — the underlying environmental triggers are strikingly similar across species.