Indiana Dunes National Park

The Indiana Dunes were formed by the interaction of Lake Michigan's waves, wind, and sand over the past 14,000 years, since the retreat of the Laurentide Ice Sheet. As the lake level fluctuated over time, it created a series of parallel dune ridges, each marking a former shoreline. The most prominent is Mount Baldy, a 126-foot living dune that is still actively moving inland at a rate of about 4 feet per year, burying trees in its path. The dunes are composed of fine glacial sand carried south by longshore currents and deposited by wave action, then shaped by onshore winds. Behind the foredunes lie older, stabilized dunes that have been colonized by black oak savannas — a globally rare ecosystem. The park also contains interdunal wetlands called pannes, which are shallow, water-filled depressions between dune ridges that support rare plants like the fragrant fern and the pitcher plant. The dynamic nature of the dunes means the landscape is constantly changing, with new dunes forming and old ones being colonized by vegetation in a process called ecological succession.

The Dune Succession Trail in the West Beach area is one of the park's most popular hikes, a 1-mile loop that climbs over 250 boardwalk steps through the full sequence of dune succession, from bare sand to mature forest, with panoramic views of Lake Michigan. The 3 Dune Challenge at the Indiana Dunes State Park (which is embedded within the national park) covers 1.5 miles and climbs the three tallest dunes — Mount Tom (192 feet), Mount Holden (184 feet), and Mount Jackson (176 feet) — with a combined elevation gain of 682 feet over soft sand. The Cowles Bog Trail is a 4.7-mile round trip through a National Natural Landmark wetland that was the site of pioneering ecological research by Henry Chandler Cowles in the early 1900s. The Little Calumet River and the Portage Lakefront and Riverwalk offer paddling and fishing. Swimming is popular at West Beach, Kemil Beach, and Porter Beach from June through September, with lifeguards at West Beach only.

Indiana Dunes National Park is located about 50 miles southeast of Chicago and is easily accessible via Interstate 94 and the South Shore Line commuter rail, which stops at several stations adjacent to the park, including Dune Park and Miller. The park is free to enter, though the embedded Indiana Dunes State Park charges a $7 per vehicle (Indiana resident) or $12 (out-of-state) entrance fee. There is no single visitor center for the national park, but the Paul H. Douglas Center for Environmental Education in Gary and the Indiana Dunes Visitor Center in Porter (operated by the state) provide information. Parking is available at individual beach and trailhead areas, but it can fill quickly on summer weekends — arriving before 10 a.m. is recommended. There is no lodging within the park itself, but the nearby town of Chesterton and the city of Michigan City offer hotels and dining. Dunewood Campground, with 66 sites, is the only campground in the national park and is open seasonally from April through October.

Summer is the busiest time, especially weekends from Memorial Day through Labor Day, when the beaches can reach capacity by mid-morning. The lake water warms to a comfortable 70°F by late July, making swimming ideal. June and July also bring the blooming of the prickly pear cactus, which produces vivid yellow flowers on the foredunes — a surprising sight in the Midwest. Fall is a quieter and visually stunning time, with the oak savannas turning gold and crimson, and migrating raptors and waterfowl passing through the park. The fall bird migration at Indiana Dunes is significant, with over 350 species recorded; the park's Green Tower bird count site is one of the most productive in the Great Lakes. Winter transforms the dunes: snow blankets the sand, ice forms dramatic shelves along the shoreline, and the stark landscape offers excellent photography. Cross-country skiing and snowshoeing are possible on park trails. Spring brings ephemeral wildflowers in the wooded areas and the return of migrating songbirds.