A college campus that doubles as a restored prairie ecosystem

Nature · Published 2 October 2026 Swipe more like this →

In short: Carleton College isn't just an academic hub; it is a massive laboratory for ecological restoration. Beyond its classrooms, the campus integrates 800 acres of diverse wilderness where students can study everything from tallgrass prairies to forest floodplains in a living, breathing landscape.

The college’s physical footprint is defined by its relationship with the land. While the main campus covers 200 acres, it is inextricably linked to the Cowling Arboretum, an 800-acre expanse that became part of the institution in the 1920s. This area was originally comprised of farm fields but has since been transformed into a complex mosaic of restored and remnant environments. These include Cannon River floodplains, bur oak (Quercus macrocarpa) savannah, tallgrass prairie, and various forest types.

The Arboretum is strategically divided by Minnesota Highway 19 into the Lower Arb to the north—which encompasses the river valley—and a smaller Upper Arb. This vast territory serves as more than just scenery; it functions as an active site for environmental study and recreation. It contains pedestrian trails, cross-country running courses, skiing paths, and a paved mixed-use bicycle trail in the Upper Arb, allowing students to engage with the landscape physically while observing its ecological diversity.

Carleton’s commitment to these systems is reflected in its sustainability metrics. The college earned an A− grade as an "Overall College Sustainability Leader" in a study of 200 large-endowment institutions. This leadership is supported by infrastructure like three geothermal bore fields located under main green spaces and Bell Field, as well as wind turbines that generate significant portions of the campus's electrical energy—with one turbine providing up to 40 percent of use and another providing over 25 percent.

This integration of nature and academia is a core part of the college's identity. From its early days in 1866, when it was established on land donated by local businessmen, the institution has grown to balance historic preservation with modern environmental stewardship. The result is a campus where the boundaries between human achievement and natural systems are intentionally blurred.

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