Ice Age

The Ice Age National Scenic Trail is a 1,200-mile footpath traversing Wisconsin, following the edge of the last continental glacier that shaped the state's landscape approximately 15,000 years ago. Designated as a National Scenic Trail in 1980, it winds from Interstate State Park on the Minnesota border to Potawatomi State Park on Lake Michigan. The trail passes through the ancestral lands of 15 Native American tribes and showcases some of Wisconsin's finest geologic and glacial features. As one of only eleven National Scenic Trails in the United States, it serves as both a premier hiking destination and a conservation resource that tells the story of the Ice Age. The trail's name derives from the Wisconsin Glaciation, the most recent series of glacial advances and retreats lasting from approximately 100,000 to 10,000 years ago that gave its name to this geological period.

The Ice Age Trail traverses remarkably diverse ecosystems across Wisconsin, from northern pine forests to southern prairies, supporting abundant wildlife populations. White-tailed deer are commonly observed along trail segments, while black bears inhabit the northern sections where extensive forests provide habitat and food sources. Wolves have expanded their range into northern Wisconsin, occasionally encountered by hikers in remote areas. The trail's varied habitats support over 300 bird species, including neotropical migrants, woodland warblers, and raptors. Wetland sections attract waterfowl, great blue herons, and sandhill cranes during migration seasons. Small mammals including red foxes, porcupines, beavers, and various squirrel species are regularly seen. The glacial kettles and bogs along the trail provide specialized habitats for unique species adapted to these Ice Age remnant environments, including rare dragonflies and butterflies.

The Ice Age Trail showcases Wisconsin's biological diversity, passing through pine forests, oak savannas, prairies, wetlands, and hardwood forests across its 1,200-mile route. Northern segments feature extensive stands of white pine, red pine, and mixed northern hardwoods including sugar maple, yellow birch, and basswood. The trail traverses remnant oak savannas in southern Wisconsin, once widespread ecosystems now reduced to scattered fragments that support diverse understory wildflowers. Prairie restoration efforts along trail corridors have reestablished native grasses including big bluestem, Indian grass, and switchgrass, along with compass plants, purple coneflower, and goldenrod. Glacial kettles and wetlands support specialized bog vegetation including sphagnum moss, pitcher plants, and sundews. Spring wildflowers carpet the forest floor in hardwood sections, while ferns and wildflowers thrive in the diverse microclimates created by glacial topography.

The Ice Age Trail follows the terminal moraine marking the maximum extent of the most recent glacial advance in Wisconsin, showcasing textbook examples of glacial landforms. Moraines, eskers, erratics, kettles, drumlins, kames, and dalles (narrow gorges) line the route, providing outdoor geological laboratories. The Kettle Moraine sections display particularly dramatic glacial features where two ice lobes met and deposited massive amounts of debris. Drumlins, streamlined hills shaped beneath flowing ice, are visible in many areas, while eskers snake across the landscape as sinuous ridges deposited by subglacial streams. Kettles, depressions formed when buried ice blocks melted, now hold lakes and wetlands. The Dells of the Wisconsin River represent spectacular dalles carved by catastrophic glacial floods. These features collectively illustrate how continental ice sheets transformed Wisconsin's landscape.

The Ice Age Trail experiences Wisconsin's continental climate, with cold, snowy winters and warm, humid summers that vary considerably across its 1,200-mile length. Northern sections may receive over 100 inches of annual snowfall, while southern areas typically see 40-50 inches. Winter temperatures regularly drop below zero in the north, while summer highs can exceed 90°F across the state. The trail is accessible year-round, with cross-country skiing and snowshoeing popular during winter months when conditions permit. Spring brings wildflower blooms but also muddy trail conditions and high water crossings. Summer offers prime hiking conditions with long days, though humidity and insects can be challenging. Fall provides spectacular foliage typically peaking from late September through mid-October, making it a favorite season for thru-hikers and day hikers alike.

The lands traversed by the Ice Age Trail have been home to Native American peoples for over 12,000 years, since the retreat of the glaciers made the region habitable. At least 15 tribal nations, including the Ho-Chunk, Menominee, Ojibwe, and Potawatomi, have ancestral connections to these lands. Indigenous peoples adapted to the glacial landscape, utilizing abundant natural resources for hunting, fishing, and gathering. French explorers and fur traders arrived in the 17th century, followed by waves of European settlers primarily of German and Scandinavian descent during the 19th century. These settlers established farms, towns, and lumber operations that transformed the landscape. Evidence of Native American effigy mounds and early settlement patterns remains visible along various trail sections, connecting hikers to the deep human history of Wisconsin.

The Ice Age Trail concept originated with Milwaukee attorney Ray Zillmer, who in the 1950s envisioned an "Ice Age National Park" spanning 500 miles to showcase Wisconsin's glacial heritage. The Ice Age Park and Trail Foundation, now the Ice Age Trail Alliance, was established in 1958 to advocate for the trail. Early trail segments were constructed in the Kettle Moraine State Forest during the late 1950s and 1960s. The National Park Service became involved in 1980 when Congress and President Carter designated the Ice Age Trail as a National Scenic Trail, one of only eleven in the nation. Since then, volunteers and partner organizations have constructed hundreds of miles of trail, with approximately 650 miles currently completed. The trail continues to expand annually as land protection and trail-building efforts connect remaining gaps through public and private partnerships.

The Ice Age Trail comprises over 650 completed miles of marked trail segments, with five designated rustic backpacking shelters and numerous camping opportunities. Highlight segments include the Kettle Moraine sections featuring dramatic glacial topography, the Chippewa Moraine segment with its deep kettles and panoramic views, and the Devil's Lake segment showcasing spectacular quartzite bluffs. The Dells of the Eau Claire County Park segment offers striking river gorge scenery. Interstate State Park marks the western terminus where the Dalles of the St. Croix display ancient basalt formations. Potawatomi State Park on the Door County peninsula serves as the eastern terminus overlooking Green Bay. The trail passes through numerous state parks, forests, and natural areas, each offering unique attractions. Connecting road walks link trail segments through communities across Wisconsin.

The Ice Age Trail is accessible from numerous trailheads throughout Wisconsin, with parking areas and signage at major access points. Five rustic backpack shelters operated by the Ice Age Trail Alliance are available on a first-come basis along the trail route. Established campgrounds in state parks and forests along the corridor provide more developed overnight options. The Henry S. Reuss Ice Age Visitor Center in the Kettle Moraine State Forest - Northern Unit offers exhibits on glacial geology and trail information. Trail maps, guidebooks, and segment descriptions are available through the Ice Age Trail Alliance website and at local visitor centers. Major gateway communities include Janesville, Madison, Wisconsin Dells, Stevens Point, and Superior. Interstate highways and state routes provide access to trailheads throughout the system. Shuttles and trail angel services support thru-hikers during peak seasons.

Conservation efforts along the Ice Age Trail focus on protecting the glacial landforms and ecological communities that make this corridor nationally significant. The Ice Age Trail Alliance works with public agencies, land trusts, and private landowners to acquire trail easements and protect connecting lands. Management activities include invasive species control, prairie restoration using prescribed fire, and habitat enhancement for native plants and wildlife. Volunteer stewardship programs engage thousands of trail adopters in maintaining trail segments and managing vegetation. The trail serves as a conservation corridor connecting fragmented natural areas across Wisconsin's developed landscape. Climate change monitoring tracks shifts in forest composition and species ranges along the trail. Educational programming helps visitors understand the glacial history and ecological significance of this unique landscape, fostering appreciation for conservation that protects the Ice Age Trail for future generations.