When Does Mackinac Island Open 2025. Registration is open for the 2025 mackinac policy conference. Plan your trip in advance by exploring the island's many options for accommodations, dining, activities and attractions.
Held at the historic grand hotel on mackinac island from tuesday, may 27, to friday, may 30, 2025 , the conference will bring. When does mackinac island close and open for the season?