Next Thursday the Castillo de San Marcos stops charging $15 a head. The city garage a block away still charges $20 per vehicle per entry between 7 a.m. and 5 p.m.

That gap is the whole story of free things in this county. The admission goes to zero and the cost moves somewhere else: to the parking, to a card you have to already hold, to a line you stand in at nine in the morning, to one date that is gone if you miss it.

Here are sixteen things that cost nothing between today and Oct. 2, sorted by what the condition actually is. Every price, time and rule below came off the operator’s own page today.

Free on one specific day, and only that day

1. The Castillo, Thursday, Sept. 17. Constitution Day is on the National Park Service’s 2026 fee-free list, so the $15 per-person entrance fee drops to nothing. First admission is 9 a.m., last admission is 5 p.m., everyone out at 5:15. The park’s hours page says visitation is lowest from mid-September through mid-November, which is now.

Two conditions. The first is on the fee-free page, last updated Jan. 5, 2026: beginning this year, free entrance on those days applies to US citizens and residents only, and nonresidents pay the regular fee. If you are here on a student visa, that is your sentence, and it is worth reading before you walk up. The one exception the page carries is the $250 Non-Resident Annual Pass, which costs sixteen times the fort.

The second is parking, and it is the number that eats the savings. The Historic Downtown Parking Facility, the 1,200-space city garage beside the Visitor Information Center, is $20 per vehicle per entry from 7 a.m. to 5 p.m., and $5 per entry from 5 p.m. to 9 p.m. St. Johns County residents pay $3 per entry instead, but only after registering a license plate at ParkStAug.com and uploading proof of residency, and the city’s page says approval takes up to 14 business days. Apply today and you are not approved by Thursday.

The Park Service’s fee page, which says it was last updated March 21, 2024, puts the city lot directly in front of the fort at $2.50 an hour and lists free parking for larger vehicles at West Castillo Drive and Riberia Street, about three blocks off. The date on that page matters. Nearly two and a half years is a long time for a parking rate to hold still, and the city and the park are two different landlords.

The remaining 2026 fee-free days are Oct. 27 and Nov. 11.

2. Fall Night Market at the Amp, Tuesday, Sept. 15, 5 to 9 p.m. Free admission, on the Amp’s own events calendar and on its Night Market page. The condition is a different kind of scarcity: this happens four Tuesdays a year. The 2026 dates are March 31, June 16, Sept. 15 and Dec. 8. Miss it and the next one is December. Parking at the Amp is limited and the venue tells you to park at R.B. Hunt Elementary or the Elks Lodge and walk in. No pets.

3. St. Augustine Record Fair, Sunday, Sept. 27, from 11 a.m. Free, all ages, at the Amp, with vendors, screen printing and food trucks. Music runs DJ Josh Aaron at 11, Toxic Cats at noon, Bears & Lions at 1:30 and DJ Josh Aaron again from 3 to 5. The listing carries its own caveat that artists, dates and times are subject to change.

4. The county budget hearing, Tuesday, Sept. 15, 5:01 p.m., St. Johns County Auditorium, 500 San Sebastian View. Free to sit in, free to speak. It is the meeting where the commission sets the property tax rate that is inside your rent, and it is on the county’s own calendar.

Free but rationed, which is the most common trap here

5. Fort Matanzas. The Park Service lists the cost of everything at that park at $0.00, ferry included, every day it runs. The ration is the boarding pass. It is free, it is required for every human riding including babies, and it is issued only in person, only on the day you ride, and only at the Fort Matanzas Visitor Center, not the city visitor center downtown. Passes go first come, first served, the park will not hold one over the phone, and its hours page says it is not unusual for all passes to be handed out before 11 a.m. No ferry Tuesdays or Wednesdays. That page says it was last updated March 23, 2025. The full comparison of the two forts ran here on Thursday. It is fourteen miles south on A1A, and no bus route reaches it.

6. The after-hours Gilded Age tour at the Lightner Museum, Thursday, Sept. 24, 6 to 7 p.m. This is a library program held off site at 75 King Street, and its listing carries no price line at all. What it does carry: registration is required, a library card is required to register, and capacity has been reached, so anyone signing up now goes on the waitlist. Enter through the side courtyard on Granada Street. Doors from 5:40.

That listing is the cleanest example of the pattern. A thing can be free and still be gone, and the library calendar shows the same status on ordinary weekday programs. The brush calligraphy class at the Bartram Trail Branch reads Closed, Registration Required.

7. The Indie Advantage music business panel, Wednesday, Sept. 23, at Spinster Abbott’s. The festival page prices it as FREE EVENT, RSVP REQUIRED, and repeats in the body that it is free and open to the public but that an RSVP is required to attend. Happy hour at 6, panel from 7 to 8, questions until 8:30. Three industry panelists on distribution, income and rights for artists working without a label. If you make anything and try to sell it, this is the one item on the list where the thing being handed out is professional advice. The RSVP is the entire gate.

Free until the end of this month

8. Community Connections. Through September, the county library’s program lets you show a library card at participating businesses for a discount. The library calls it more than 100 businesses. The table it published carries 117 rows under the header.

The offers are specific. The Oldest House Museum Complex is listed at 50% off entry. Villa Zorayda Museum is listed at 50% off adult general admission. Epic Theatres is listed for a free small popcorn. Osprey Tacos is listed for one free basket of chips, limit one per library card per day. Third Space Improv is listed for a free show ticket.

The condition is the calendar. The program runs throughout September, which is twenty days counting today, and it needs a card already in your hand.

Free starting Oct. 1

9. Driving onto the beach. The county collects beach driving tolls March 1 through Sept. 30. From Oct. 1 through Feb. 28 its own page says passes are not required. That is 20 days out. Until then it is $10 a day at the booth whether you live here or not, and there is no local rate on a daily pass. The full breakdown ran Thursday.

Two rules survive into the free window. County beach gates close at 7:30 p.m. and reopen at 8 a.m. through Oct. 31, and the A Street ramp in St. Augustine Beach closes at 5 p.m. daily, year round.

Free with a card, and the card is not free for everyone

10. A St. Johns County library card. Free to any county resident or taxpayer who brings a government-issued photo ID plus one of a Florida driver’s license, a Florida voter registration card, a utility bill, or a Florida property tax receipt. Anyone 17 or younger needs a legal guardian physically present at sign-up.

If you cannot prove a county address, the price list is on the same page: $100 a year, $30 for three months, $12 for 30 days. Residents of fifteen reciprocal Florida counties, Clay, Flagler, Putnam and Nassau among them, get a free non-resident card, but that card does not carry Libby or Kanopy. And if you are between addresses with no way to prove one, there is a free restricted-user card that expires in three months and holds you to two items at a time.

What the card opens, per the library’s own list: Libby, Kanopy, New York Times and Wall Street Journal digital access, free public computers and internet, free reservable meeting rooms at all six branches, and a seed library at the Main and Southeast branches. Ancestry works only inside a branch. Westlaw only at the Main Library.

The fine print is short and worth knowing before you borrow anything. Overdue books run $0.25 a day to a $5 cap per item. Library of Things items run $1 a day to a $10 cap. Black-and-white printing is $0.20 a page. A replacement card is $1. That schedule covers Oct. 1, 2025 through Sept. 30, 2026, so the numbers above are good for nineteen more days.

Free, with nothing in the way but getting there

11. The Amp farmers market, every Saturday, 8:30 a.m. to 12:30 p.m. Free admission. Shop with SNAP or EBT and the Fresh Access Bucks match adds free Florida-grown produce on top of what you spend. Donation-based yoga and donation-based bike repair run the first and third Saturday of the month, which this month means Sept. 19.

12. The Amp After Parties, Sept. 25 through 27, at Ponce De Le Rollin. All three nights free and open to all ages. Doors 11 p.m. and sets 11:30 to 2 on Friday and Saturday. Sunday is earlier: doors 7:30, show 8 to 10. No skating on those nights. Remy Cole wrote these up in full.

13. Sing Out Loud weekend three, Sept. 18 through 20. Eleven rooms on the festival’s own weekend page, no cover. The festival piece is here, and this weekend’s listings are here.

The thing you cannot plan around is the ride. The city’s parking page says all festival shuttles are free, ADA accessible and run continuously during the festival, and that the downtown garage has traditionally been closed while it is on. The shuttle exists on paper and the timetable does not, at least not anywhere a reader can find it.

14. Crisp-Ellert Art Museum, 48 Sevilla Street. Admission is listed as free and open to the public, including special events unless otherwise noted. Nicole Antebi’s “Rebel Waters / Aguas Rebeldes” runs through Nov. 7. A workshop tied to the fall residency is Wednesday, Sept. 16, 6 to 8 p.m. at the museum, with an RSVP, and a conversation with the artist is Monday, Sept. 28 at 6 p.m. in the Virginia Room.

The condition is that the museum’s visit page publishes exactly one hours block, and that block covers May 15 to June 25 and says the museum is closed July and August. There are no fall hours on it. Email crispellert@flagler.edu before you walk over, because the page will not tell you whether the door is open.

15. Walking onto the beach. The toll has only ever applied to driving. The county’s own FAQ says pedestrian access remains open 24 hours a day, across all 42 miles of coastline, in every month including the seven the booths are collecting.

Free, but the date is not published

16. The Matanzas Inlet Walk at the GTM Research Reserve. The reserve’s page says in terms that the walk is free and that online registration is required. It prints no date. It tells you to call 904-380-8600 for scheduled hikes and registration details. Hikers meet at the Matanzas Inlet west parking lot at 9:15 and walk at 9:30.

Worth knowing before you drive up there: the reserve’s visit page prices the Visitor Center at $3 per group of up to five for ages 12 and over, children under 12 free, and the Guana Dam, trails and beach lots at $3 per vehicle or $1 per pedestrian or cyclist. The fourth-Saturday beach cleanup, 9 to 11 a.m., takes no registration at all.

What it costs to get to any of this

Without a car, the Sunshine Bus is $2 per one-way trip, or $1 if you are a student, 60 or over, on Medicare or Medicaid, or a person with a disability. A day pass is $4, or $2 discounted. A month is $30, or $15. Fares are paid on boarding and drivers cannot make change, so bring the exact amount. Children 6 and under ride free.

The county beach shuttle will not help you. It runs only on Memorial Day, Independence Day and Labor Day weekends, 10 a.m. to 4 p.m., between Cornerstone Park and Mickler’s Beachfront Park. All three of those weekends have passed, and the county page says the Pier shuttle is no longer available.

The cheapest useful thing you can do today takes about twenty minutes. Bring a photo ID and one document with a St. Johns County address to any of the six branches and get the card. It costs nothing if you live here, it is what puts you on the Sept. 24 waitlist, and the 117-business discount list it unlocks stops working on Sept. 30.