St. Augustine Forts: Castillo, Matanzas, and Mose

Compare entrance fees, parking availability, and ferry schedules for Castillo de San Marcos, Fort Matanzas, and Fort Mose before your Florida trip.

Ekin Yalgın

March 18, 2026·6 min read

St. Augustine Forts: Castillo, Matanzas, and Mose

Fighting for a parking spot near the historic downtown just to realize the ferry tickets for the southern outpost are already sold out ruins many itineraries. Navigating the three distinct military monuments of the city requires knowing exactly when to arrive and which transport method works best for each location.

Castillo de San Marcos: City center. Admission $15 per adult (15 and under free). Cashless only - no cash accepted. Parking is limited and fills fast.
Fort Matanzas: 14 miles south. Completely free, including the ferry. Ferry runs Thursday-Monday only. Parking is free and spacious.
Fort Mose: North of downtown. Grounds free, museum $2. Boardwalks currently closed (check status before visiting). Ample on-site parking.

Castillo de San Marcos: The Undefeated Coquina Fortress

This massive waterfront bastion dominates the downtown landscape. The structure owes its resilience to coquina, a unique local limestone composed of compressed shells quarried from nearby Anastasia Island. The porous walls absorbed cannon fire instead of shattering under impact.

Construction ran from 1672 to 1695, and when British forces bombarded the fort in 1702 and again in 1740, the soft stone compressed on impact rather than crumbling, leaving the walls intact each time. No other fort material in North America performed like this.

Walking through the lower chambers feels heavy. The air is damp, the arched ceilings surprisingly low. Climbing the narrow stairs to the gun deck offers expansive views of Matanzas Bay stretching south toward the horizon. Note that the upper gun deck closes during thunderstorms, which are common on Florida summer afternoons - visit in the morning to guarantee access.

Parking and Best Time to Visit

The fort opens daily at 9:00 AM. Finding a spot in the adjacent lot is nearly impossible by mid-morning on weekends, and the lot charges $2.50 per hour. A better option is the 1 Cordova Street garage (Historic Downtown Parking Facility), which offers more space at the same rate. Walk the few blocks to the entrance from there - it takes less time than circling the one-way streets around the fort.

Cannon firing demonstrations take place on weekends (Saturday and Sunday) at 10:30 AM, 11:30 AM, 1:30 PM, 2:30 PM, and 3:30 PM. Arrive early to secure a spot on the upper deck. Note that demonstrations are cancelled during thunderstorms. Your admission ticket is valid for 7 consecutive days, so if you're staying in St. Augustine for a few days, you can return without paying again.

The least crowded months are September through November. Peak summer brings over 3,500 daily visitors on busy days. Weekday mornings are consistently the quietest windows.

Fort Matanzas: The Southern Watchtower

Guarding the southern river approach, this smaller outpost feels completely isolated from the busy city center. Located 14 miles south of downtown, the surrounding coastal environment consists of dense maritime forests and marshlands. The contrast with the urban Castillo is striking.

You cannot drive directly to the structure. Access is strictly limited to small passenger boats departing from the visitor center dock.

How to Secure Ferry Boarding Passes

The boat ride is completely free of charge, but you must obtain a physical boarding pass from the ranger station. A few critical details that catch visitors off guard: the ferry operates Thursday through Monday only (closed Tuesday-Wednesday), capacity is limited to 30 people per trip, and passes are issued on a first-come, first-served basis. Arrive at least 20 minutes before your desired departure to secure a pass - they frequently run out well before noon on busy days.

The ferry departs at 9:30, 10:30, 11:30, 1:30, 2:30, and 3:30 (weather permitting). The crossing takes roughly 10 minutes, and the full visit including the ferry ride rounds out at about 45 minutes. If your assigned departure is later in the day, the surrounding nature trails make for a pleasant wait.

Navigating the Rattlesnake Island Nature Trails

The barrier island environment provides excellent wildlife spotting opportunities. The boardwalk trail winds through a shaded live oak forest draped in Spanish moss.

The sandbars near the inlet are ideal for beachcombing away from the typical tourist zones. Keep a safe distance from the water's edge - inlet currents pull surprisingly fast. No food, drinks, or pets are permitted on the ferry or inside the fort itself.

Fort Mose: America's First Legally Sanctioned Free Black Settlement

Tucked away in the northern marshes, this site represents a critical piece of freedom-seeking history. Enslaved people who escaped British colonies in Carolina found refuge here starting in 1738, pledging loyalty to the Spanish crown in exchange for freedom.

The Spanish governor granted official recognition to the community, making it the first legally established free Black settlement in the territory that would become the United States. At its peak, Fort Mose housed over 100 residents under the leadership of Captain Francisco Menéndez, himself a formerly enslaved man.

The original wooden structures are long gone, reclaimed by the marsh waters over the centuries. A modern reconstruction now stands on the grounds to help visualize the past.

Visiting the Museum and Grounds

The park grounds are open daily from 9:00 AM to 5:00 PM, free to enter year-round. The visitor center and museum (admission $2 per adult) is open Thursday through Monday. The museum tells the complex story of the settlement through interactive exhibits.

As of early 2026, the outdoor boardwalk trails are closed for maintenance. Before planning your visit, check the Florida State Parks website or call ahead to confirm the boardwalk status. When open, the elevated paths extend deep into the wetland ecosystem, with marsh breezes and tall vibrant grasses offering a quiet, reflective atmosphere unlike anything at the busier downtown monuments.

Which St. Augustine Fort Should You Visit?

Your choice depends entirely on your available time and transportation limits. The downtown fortress requires at least two hours and involves dealing with heavy traffic and limited parking. It remains the best option for visitors wanting an immense, immersive architectural experience.

The southern watchtower offers a more intimate, nature-focused excursion. The mandatory boat ride adds an adventurous element, making it highly engaging for families with restless children - just confirm it's a Thursday-Monday visit before planning the trip.

The northern settlement provides deep cultural context without the overwhelming crowds. Choose this site for a peaceful walk and a powerful historical narrative, but check boardwalk status before going.

All three together make a logical full-day circuit: start north with Fort Mose, move downtown to the Castillo by mid-morning to catch a cannon demonstration, then head south to Fort Matanzas in the afternoon. Secure your ferry passes first thing in the morning before any other stop.

FAQ

Frequently Asked Questions

Admission to Castillo de San Marcos is $15 per adult. Visitors under 15 enter free of charge. The fort is open daily from 9:00 AM to 5:00 PM, and your ticket is valid for 7 consecutive days.

Yes, Fort Matanzas National Monument is completely free, including the ferry ride to the island fort. You must collect a physical boarding pass at the ranger station on a first-come, first-served basis. The ferry runs Thursday through Monday at 9:30, 10:30, 11:30, 1:30, 2:30, and 3:30.

Access to Fort Matanzas is only possible via a ranger-led ferry departing from the visitor center dock, located 14 miles south of downtown St. Augustine. The crossing takes roughly 10 minutes. You cannot drive or walk to the fort since it sits on Rattlesnake Island, separated from the mainland by the Matanzas River.

Cannon firing and historic weapons demonstrations take place on weekends (Saturday and Sunday) at 10:30 AM, 11:30 AM, 1:30 PM, 2:30 PM, and 3:30 PM. These sessions are performed on the upper gun deck and offer a vivid look at colonial defense tactics.

The most reliable option is the Historic Downtown Parking Facility at 1 Cordova Street, which charges $2.50 per hour and has more availability than the small lot directly adjacent to the fort. Arrive before 9:00 AM on weekends to avoid parking stress entirely.

Fort Mose served as the first legally sanctioned free Black settlement in what would become the United States. It provided refuge for enslaved people who escaped British colonies by pledging loyalty to the Spanish crown, and it acted as a northern military outpost defending St. Augustine. The site is now a Florida State Park with a museum and wetland boardwalks.

Coquina is a rare limestone made of ancient compressed shells that became essential to St. Augustine's defenses because of its unique ability to absorb cannon fire. Instead of shattering like brick or granite, the soft stone compressed under impact, making the walls of Castillo de San Marcos effectively indestructible during repeated British sieges in 1702 and 1740.

Pets are generally permitted on the outdoor grounds and trails of the national monuments but are not allowed inside the fort structures or on the ferry boats to Fort Matanzas. Service animals are the exception and may access all public areas.

The park grounds at Fort Mose Historic State Park are free to enter year-round. The visitor center and museum charges $2 per adult and is open Thursday through Monday from 9:00 AM to 5:00 PM.

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