Yes, seasonal closures happen (but it depends on where you are).

Northern islands with bridge access often close for ice or scheduled maintenance. Think Mackinac Bridge, Cape Cod bridges during nor’easters, or any smaller causeway that can ice over. It’s not a universal rule, but check your specific island’s DOT page.

If you’re heading to an island in a cold-weather state, assume the bridge or ferry runs on a winter schedule. Some bridges have wind or ice thresholds (e.g., Mackinac closes over 70 mph gusts). Others close for annual repaving. The season runs roughly November through March, but surprise closures happen.

The real hassle is getting stuck on the mainland when you planned to cross. Always check the official site before you leave—don’t trust Google Maps to know about a sudden ice closure. Future you will thank you for the ten-second lookup.