# Castillo de San Marcos National Monument > Place to go for families in the Jacksonville area (FL). Times are Eastern Time. - When: Open daily except Thanksgiving and Christmas Day; first admission 9:00 a.m., last… - Where: Castillo de San Marcos National Monument, 1 South Castillo Drive, Saint Augustine, FL 32084 - Ages: All ages; children (age 15 and under) free with an adult - Price: Adults (16+) $15, valid 7 consecutive days; children (age 15 and under) free; cards only. Fee-free days include Nov 11 (Veterans Day). - Schedule: Open daily except Thanksgiving and Christmas Day; first admission 9:00 a.m., last admission 5:00 p.m., visitors exit by 5:15 p.m. - Organizer: National Park Service — Castillo de San Marcos National Monument - Official page: https://www.nps.gov/casa/ - Last checked: Sat, Oct 24 Source: Grassy Knees is a directory of real family events, places and programs for kids across major U.S. metro areas, where every listing is researched from the organizer’s own page and shows the date we last checked it. https://grassyknees.com covers 42 metro areas as of Oct 24, 2026, with more added regularly. About: https://grassyknees.com/about Freshness: listings are re-checked on a daily research run (latest check 2026-10-24), and new events are added as organizers post them. Sell-outs, weather cancellations and time changes show up on the live page first: https://grassyknees.com/jacksonville/activities/castillo-de-san-marcos-national-monument--listing-d7ebee56e56b9e61593215b0 ## About The 17th-century Spanish stone fort on St. Augustine's bayfront, run by the National Park Service. Children can explore the fort's lower rooms and historic weapons, climb to the upper gun deck, and talk with rangers, volunteers or costumed soldiers; outside, they can walk the perimeter past the moat, water battery and north boardwalk. The fort sits on 20 open, grassy acres where the north lawn is popular for picnics and kite flying. Kids can pick up the Junior Ranger activity book to earn a badge and patch. The gun deck closes during thunderstorms, but lower rooms stay open. Visitation is lightest from mid-September to mid-November and heaviest from Christmas to New Year's. ## Similar picks in Jacksonville - [Spooktacular at Jacksonville Zoo](https://grassyknees.com/jacksonville/activities/spooktacular-at-jacksonville-zoo--listing-5b4f68095af1d1aecc8b1eb5) — Sat, Oct 24 (+4 more dates) · 6:00 PM – 10:00 PM · Jacksonville Zoo and Gardens · All ages · From $35 · checked Oct 24. Jacksonville Zoo and Gardens' long-running Halloween night event, now in its 39th year, reopens the zoo after hours as a one-way trail of lights and Halloween scenes. Families… - [Fort Matanzas National Monument and Ferry](https://grassyknees.com/jacksonville/activities/fort-matanzas-national-monument-and-ferry--listing-41203be3ad2374febf7d8091) — Park open daily 9:00 a.m.–5:30 p.m. except Thanksgiving and Christmas. Ferry… · Fort Matanzas National Monument Visitor Center, Saint Augustine · All ages · Free · checked Oct 24. A small Spanish watchtower fort on Rattlesnake Island at Matanzas Inlet, reached by a free National Park Service passenger ferry from the visitor center dock. The round trip… - [Beaches Town Center Children's Fall Fest Trunk or Treat & Costume Party](https://grassyknees.com/jacksonville/activities/beaches-town-center-children-s-fall-fest-trunk-or-treat-and-costume-pa--listing-5e11160ab414e1eb81ccfee6) — Wed, Oct 28 · 5:00 PM – 7:00 PM · Seahorse Oceanfront Inn parking lot, Beaches Town Center, Neptune Beach · checked Oct 24. A weeknight Halloween party for kids at Beaches Town Center, where Atlantic Beach and Neptune Beach meet. Bring costumed little ghouls and goblins for golf-cart… - [ESTUSCARY Haunted Trail at GTM Research Reserve](https://grassyknees.com/jacksonville/activities/estuscary-haunted-trail-at-gtm-research-reserve--listing-5dcca68b5aa45211391dd0cc) — Thu, Oct 29 (+1 more date) · 7:00 PM – 9:30 PM · GTM Research Reserve, Guana South Beach Access, Ponte Vedra Beach · From $20 · checked Oct 24. A nighttime Halloween haunted trail at the Guana Tolomato Matanzas (GTM) Research Reserve, with scares, surprises and festive activities on the trail each evening. Costumes are… - [Carver Center Trunk-or-Treat](https://grassyknees.com/jacksonville/activities/carver-center-trunk-or-treat--listing-273d9ce52947da83b8908083) — Fri, Oct 30 · 6:00 PM – 7:30 PM · Carver Center, Jacksonville Beach · Free · checked Oct 24. A free neighborhood Halloween party at Jacksonville Beach's Carver Center recreation center, with trunk-or-treat candy, food, games and bounce houses for children in costume. It… - [Trunk-or-Treat and Moonlight Movie at the Seawalk Pavilion](https://grassyknees.com/jacksonville/activities/trunk-or-treat-and-moonlight-movie-at-the-seawalk-pavilion--listing-45a1726e8fd0e2e5b28269db) — Fri, Oct 30 · 5:00 PM – 8:45 PM · Latham Plaza & Seawalk Pavilion, Jacksonville Beach · All ages · Free · checked Oct 24. Jacksonville Beach's Halloween evening on the oceanfront. From 5 pm local businesses line up for a Trunk or Treat at Latham Plaza and the Seawalk Pavilion, handing out candy and… ## More for families - [This weekend in Jacksonville](https://grassyknees.com/jacksonville/this-weekend) (Markdown: https://grassyknees.com/jacksonville/this-weekend.md) - [Things to do with kids in Jacksonville](https://grassyknees.com/jacksonville) (Markdown: https://grassyknees.com/jacksonville.md)