Green Island is the largest privately owned island in the waters of Green Bay, offering a singular "blank canvas" opportunity in the heart of the Midwest’s most celebrated coastal region. Known as the "Cape Cod of the Midwest," the surrounding Door County area is a premier tourism hub, positioning this 70-acre island for a transformative large-scale development. Whether envisioned as Wisconsin’s own "mini Mackinac Island" or a sovereign private sanctuary, Green Island balances radical seclusion with immediate proximity to over 20 mainland marinas and the affluent boating corridors of the Great Lakes.
Property Details
The island is currently undeveloped, providing a rare opportunity for ground-up infrastructure and architectural design.
Historic Landmarks: The site contains the stone foundation of a former two-story lighthouse, offering a storied focal point for future construction.
Operational Beacon: A steel windmill-style beacon, maintained by the U.S. Government on its own 0.79-acre parcel, remains active for maritime navigation.
Construction Potential: The terrain is generally level with a gravel soil base, providing stable foundations for diverse use-cases including vineyards, hospitality venues, or a luxury residential compound.
Land & Waterfront
The 70-acre landmass sits in the calmer, warmer waters of Green Bay, sheltered from the rougher conditions typical of the Lake Michigan side.
Shoreline: The island features a sprawling perimeter of accessible waterfront with scenic views of the Door County peninsula and the Marinette coastline.
Landscape: The interior is level and suited for the creation of nature trails, sailing camps, or organic agricultural projects such as island-based viticulture.
Access & Utilities
Logistics are supported by the island’s central position between major Midwest metropolitan hubs.
Transit: Easy access from Minneapolis, Chicago, and Milwaukee via the mainland hubs of Marinette or Door County. Boating transit times range from 15 to 30 minutes from established marinas in Egg Harbor or Fish Creek.
Utilities: As a 2026 non-developed asset, the island requires the installation of independent well and septic systems. Its navigational prominence and proximity to the mainland make it a highly feasible candidate for modern sustainable utility integration.
Lifestyle & Value
Green Island is a high-yield investment opportunity in a region that attracts over two million visitors annually. Its potential for a high-occupancy resort, wedding venue, or exclusive sailing club is supported by the historic growth of the Door County tourism market. For a single buyer, it offers a level of absolute privacy that is impossible to replicate on the mainland, secured by a rare freehold title in the Great Lakes.
