MD District - The Assateague Island Visitor Center is open daily from 9 am - 5 pm, March through December. January and February open 9 am - 5 pm, Thursday through Monday.
VA District - The Toms Cove Visitor Center is open daily from 9 am - 5 pm, May through October and from 9 am - 4 pm daily in March, April and November. It is open Fridays through Mondays from 9 am - 4 pm in December, January and February.
Both visitor centers are closed on Thanksgiving and Christmas days.