National Monument · FL
Castillo de San Marcos National Monument is partially closed.
Last checked Wed, 14 Oct 2026 13:00:58 GMT
A federal government shutdown is in effect. Access and staffing at National Park Service sites vary — some close and barricade entrances, some stay open but unstaffed. Live shutdown status →
Built by the Spanish in St. Augustine to defend Florida and the Atlantic trade route, Castillo de San Marcos National Monument preserves the oldest masonry fortification in the continental United States and interprets more than 450 years of cultural intersections.
| Mon | 9:00AM - 5:00PM |
| Tue | 9:00AM - 5:00PM |
| Wed | 9:00AM - 5:00PM |
| Thu | 9:00AM - 5:00PM |
| Fri | 9:00AM - 5:00PM |
| Sat | 9:00AM - 5:00PM |
| Sun | 9:00AM - 5:00PM |
We derive Castillo de San Marcos National Monument's status from the National Park Service's own alerts and operating hours, refreshed hourly — this is our reading, not an official determination. As of the last check: Construction for Seawall Project Full method: how we check park status.