Mackinac Island Opening Dates 2024 Schedule. But late april and early may is when mackinac island really “opens” by rolling out the welcome mat to visitors. This summer will see small details added to the site, including a privy, pump, and flagpole.

Mackinac island is always “open” but the main thrust of our season is from may through october. Mackinac island cruise port map with cruise ship locations and cruise schedule arrivals/departures.