Fort Zachary Taylor: Key West's Best Beach Is Hidden Behind a Navy Gate (and It Sits on the Largest Civil War Cannon Stash in America)

The thing nobody tells you about Key West's best beach is that you have to drive past a working Navy base to reach it. You turn off Southard Street, roll through the Truman Annex gate, follow a road that feels like it's about to dead-end into a parking lot, and then — almost grudgingly — the island hands you the clearest water and the quietest sand in town. Locals call it Fort Zach. Day-trippers off the cruise ships almost never find it, which is exactly why it's worth the detour.

Fort Zachary Taylor Historic State Park is three good things stacked on one peninsula: the best swimming beach on the island, the best snorkeling you can do without a boat, and a hulking Civil War fort that happens to sit on the largest collection of Civil War cannons in the United States. Most visitors come for one of those and stumble onto the other two. Here's how to get all three right in a single afternoon.

Why this beach beats the postcard ones

Key West has a beach problem, and it's worth understanding before you waste an afternoon on the wrong sand. Smathers Beach, the long strip along the Atlantic side, gets named "best beach" by people who like soft, imported sand and a row of jet-ski rentals. It's fine. But the sand was trucked in, the water tends toward cloudy, and on a cruise day it's wall-to-wall towels.

Fort Zach is the opposite trade. The "sand" is mostly ground coral and rock, which is hard on bare feet and the single most important thing to know before you go. But that same rocky bottom is why the water here is the clearest in Key West — there's no fine silt to kick up and cloud the view. You give up the barefoot-stroll fantasy and you get genuinely transparent Gulf water in return. For anyone who came to the Keys to actually see fish, that's not a close call.

The beach sits under a stand of Australian pines that throw real shade — a rarity on a Florida beach — with picnic tables tucked underneath. There's a beach concession, the Cayo Hueso Café, serving sandwiches (most under $12) on a shaded patio overlooking the water, plus rentals for snorkel gear, chairs, and umbrellas if you came empty-handed.

Bring water shoes. This is the one mistake everyone makes. The entry into the water is rocky, the bottom is rubble, and flip-flops will float right off your feet the moment you wade in. Water shoes are sold in the park gift shop if you forget, but you'll pay tourist prices for them. Pack a cheap pair before you leave the mainland.

The snorkeling: jetties, parrotfish, and the occasional nurse shark

If you've only ever snorkeled off a soft-sand beach and been disappointed, Fort Zach will reset your expectations. The action is around the two rock jetties — the breakwaters on the left and right edges of the swimming area. The rocks give fish something to live in, and the clear water gives you something to see them through.

What's down there: parrotfish grazing on the rocks, schools of silvery hardhead silversides, yellowtail snapper, the occasional grouper, and — this is the one that makes people gasp into their snorkels — nurse sharks resting in the shadows of the jetty rocks. They're docile bottom-dwellers and they want nothing to do with you. Leave them alone and they'll leave you alone. Fishermen work the same jetty from above, casting for snapper, jacks, and tarpon, so give the lines a wide berth.

A few honest caveats. This is shore snorkeling, not a reef trip — the famous coral reef is seven miles offshore and needs a boat. Visibility here swings with the wind and the tide; a calm morning before the afternoon sea breeze picks up is your best window, and a strong south wind can stir the bottom up enough to kill the clarity entirely, so check the forecast before you build your whole afternoon around it. And the rocks that make the snorkeling good also make the entry awkward, so wade in carefully and consider fins you can put on in waist-deep water rather than fighting them on at the shoreline. One more local trick: stay close to the rocks. The fish congregate where there's structure, and the open sandy patches in the middle of the swim area are comparatively empty — beginners tend to drift to the middle and then wonder where everything went. (If you're weighing a full day trip to the outer reef or the fort at Dry Tortugas instead, that's a different — and pricier — decision; our day-trip vs. overnight breakdown walks through when each is worth it.)

The fort: a dentist, a shovel, and 1968

Walk up from the beach and you hit the reason the whole place has "Fort" in its name. Fort Zachary Taylor is a squat brick fortress that took roughly two decades to build — construction started in 1845 and dragged through the 1850s, slowed by yellow fever epidemics and supply problems so chronic that the fort wasn't really finished until after the Civil War. It was named for President Zachary Taylor in late 1850, just months after he died in office.

Here's the twist that makes the fort more interesting than your average pile of bricks: Florida seceded in January 1861, but the fort never fell into Confederate hands. On January 13, 1861, a Union captain named John Milton Brannan quietly moved his 44 artillery troops into Fort Taylor — without waiting for orders — and locked it down before the Confederacy could grab it. For the rest of the war, the fort anchored the Union blockade of the Gulf, choking off the blockade runners trying to slip cotton out and supplies in. A Union fort, behind enemy lines, the entire war.

Then it got buried. In the 1890s, as the Army modernized for the Spanish-American War, engineers built a new gun battery — Battery Osceola — right on top of the old fort, and rather than haul the obsolete Civil War cannons away, they used them as fill. Dozens of cannons got entombed inside the new walls and forgotten.

For seventy years they stayed there. Then in 1968 a Key West dentist named Howard England started digging. He recruited volunteers he called his "sandhogs" and spent the next five years excavating cannons, shot, and ammunition out of the fort's walls and moats. By the time he was done he'd unearthed what's now recognized as the largest collection of Civil War cannons in the country — sources put the haul at dozens of guns (one commonly cited figure is 69), ranging from massive 10-inch Rodman guns to 100-pounder Parrott rifles. England's work is the reason the fort went from a forgotten eyesore to a National Historic Landmark in 1973, and to a Florida state park that opened to the public in 1985. Not bad for a guy whose day job was filling cavities.

The fort is open for self-guided wandering until 5 p.m. (the beach and park stay open later). It's genuinely worth the half hour — cool, breezy brick casemates, the cannons England saved, and views back across the harbor. Look for the slit windows and you'll understand the original design: thick brick walls, two tiers of gun positions, built to throw fire across the only deep-water approach to the harbor. The supporting defenses on the island were a pair of Martello towers, squat circular gun platforms borrowed from a Mediterranean design; one of them survives across town as the West Martello, now home to the Key West Garden Club, if you want to see the cousin structure.

There's a presidential footnote, too. The Navy base next door — the same Truman Annex you drove through to get here — was Harry Truman's "Little White House," and the president spent 175 days across 11 visits working from Key West. The Secret Service even carved out a private beach for him on the grounds. So when you're floating off the jetty, you're swimming the same patch of water a sitting president once had cleared just for himself.

The sunset nobody fights you for

Key West has built an entire nightly ritual around the sunset at Mallory Square — street performers, tarot readers, a crush of cruise-ship crowds, and someone selling you a frozen drink the size of your head. It's a spectacle, and it's worth seeing once. But if you actually want to watch the sun go down without elbowing for a sightline, Fort Zach is the local answer.

The park faces due west and stays open until sundown, which means you get the same horizon, the same golden hour, and a fraction of the people. Bring a chair, post up on the beach or the old fort wall, and watch the "green flash" crowd settle in without the carnival. If you leave the park during the day and want to come back for sunset, hang on to your entry receipt — it can save you a second fee at the gate.

How to actually do it

A few logistics to make the visit smooth:

• Getting in: The entrance is through the Truman Annex on the western tip of the island, off Southard Street. As of 2026, it's $6 per vehicle (2–8 people) or $2.50 if you bike or walk in. State park fees creep up over time, so treat that as a guide, not gospel — confirm at the gate.
• Biking is the move. Old Town Key West is tiny and parking is a headache everywhere; the park is an easy, flat ride from most of downtown, and you skip the vehicle fee. If you're already exploring on foot (say, after the Hemingway House a few blocks away), it's a short detour.
• Timing: Come in the morning for the calmest, clearest snorkeling water, or in the late afternoon to slide straight into sunset. Midday on a cruise day is the most crowded window, though "crowded" here still beats Smathers.
• What to pack: Water shoes (non-negotiable), reef-safe sunscreen, your own snorkel gear if you have it, and a towel. Shade exists under the pines but the good spots go early.
• Hours: Park open 8 a.m. to sundown; the fort itself closes at 5 p.m.; the beach concession runs roughly 10 a.m. to 5 p.m.

If you're trying to decide whether Key West is even worth the trip versus staying put up the coast, that's a fair question — we put the two head to head in Miami vs. Key West. But if you're already on the island and you only have time for one beach, this is the one. Best water, best snorkeling, best sunset, and a Civil War fort thrown in for the price of a $6 gate fee. Just don't forget the water shoes.