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July 26, 2026Sources cited
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Science & Nature • Mammals

Groundhog

The groundhog, also called a woodchuck or whistlepig, is a large North American rodent in the squirrel family and one of the marmots.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

The groundhog (Marmota monax), also known as the woodchuck or whistlepig, is a large North American rodent in the squirrel family and a member of the Marmot group. It is known for its burrowing habits, herbivorous diet, and winter hibernation. Groundhog Day, observed on 2 February, is a folk tradition based on the animal's emergence from its burrow.

Description

Groundhogs are stout, brown-furred rodents with short legs and strong claws for digging. They are closely related to squirrels and are part of the Marmot group. Adult groundhogs typically measure about 20 inches in body length, with a tail of 6 to 8 inches, and weigh around 11 pounds on average. Their lifespan in the wild is about 3 to 6 years.

Habitat and behavior

Groundhogs are strong burrowers, creating extensive underground dens. They are active during the warmer months and spend the winter in hibernation, relying on stored body fat.

Diet

Groundhogs are primarily herbivores, feeding on green plants, grasses, leaves, fruits, and vegetables. They may occasionally consume small amounts of other food.

Groundhog Day

Groundhog Day is a popular North American tradition held on 2 February. According to folklore, if a groundhog sees its shadow upon emerging from hibernation, winter will persist for six more weeks. In Canada, the tradition is observed with local groundhogs such as Wiarton Willie.

Key facts

  • Groundhogs are members of the Marmot group in the squirrel family, also known as woodchucks or whistlepigs.
  • They are strong burrowers and hibernate through the winter.
  • Their diet is primarily herbivorous, consisting of green plants, fruits, and vegetables.
  • Groundhog Day on 2 February is a folk tradition based on the animal's emergence from its burrow.
  • Groundhogs are native to Canada and are familiar wildlife in southern Canada.
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Canadian context

Groundhogs are native to Canada and are familiar wildlife in much of southern Canada. Groundhog Day is also observed in Canada, where local animals such as Wiarton Willie are part of regional traditions.

Frequently asked questions

What is a groundhog?
A groundhog is a large North American rodent, also called a woodchuck or whistlepig, and it belongs to the marmot group in the squirrel family.
How big do groundhogs get?
Adult groundhogs are typically about 20 inches long, plus a tail of roughly 6 to 8 inches, and may weigh around 11 pounds on average.
What do groundhogs eat?
Groundhogs mostly eat green plants, grasses, leaves, fruits, and vegetables. They are primarily herbivores.
Do groundhogs hibernate?
Yes. Groundhogs are true hibernators and spend winter in a dormant state, living off stored body fat.
How long do groundhogs live?
Wild groundhogs commonly live about 3 to 6 years, although lifespan can vary by location and conditions.
What is Groundhog Day?
Groundhog Day is a folk tradition on 2 February in which a groundhog’s shadow is said to predict whether winter will last six more weeks.

References

  1. U.S. Fish & Wildlife Servicehttps://www.fws.gov/story/fun-facts-about-groundhogs
    Supports: Groundhogs as rodent/squirrel relatives; average weight; diet; Groundhog Day tradition.
  2. National Geographichttps://www.nationalgeographic.com/animals/mammals/facts/groundhog
    Supports: Scientific name; marmot classification; hibernation; Groundhog Day folklore.
  3. PBS Naturehttps://www.pbs.org/wnet/nature/blog/groundhogs-facts/
    Supports: Groundhog classification and Groundhog Day explanation.
  4. Cincinnati Parkshttps://www.cincinnati-oh.gov/cincyparks/news/5-fun-facts-about-groundhogs/
    Supports: Hibernation details and burrow facts.
  5. Havaharthttps://www.havahart.com/groundhog-facts
    Supports: Average size and lifespan.
  6. Sheldrake Environmental Centerhttps://www.sheldrakecenter.org/top-10-fun-facts-about-groundhogs/
    Supports: First official Groundhog Day in Punxsutawney in 1887.