Sand Key is a reef about 7 miles west-southwest of Key West, marked by the old Sand Key Lighthouse, an iron tower completed in 1853 that no longer works as a light. The coral grows in ridges 5 to 20 feet deep with sandy channels between them, shallow enough to float over, and the reef is a protected Sanctuary Preservation Area. You reach it by boat. On group trips the captain picks the reef on the day, and Sand Key is one of the reefs crews use, but no group trip we review guarantees it.
The trips that come closest are Sebago’s. Its seafood two-stop snorkel names Sand Key as an example stop, and its Afternoon Snorkel Sail is the most reviewed afternoon reef trip we review: from $60 per person (checked November 2026), 4.4 from 1,621 reviews on Viator, with the captain choosing the reef by wind and water.
Key West Afternoon Snorkel Sail with Unlimited Cocktails!
- 4.4/5 (1,621 reviews)
- About 3 hours
- Free cancellation
- Operated by Sebago Key West
Includes Use of snorkeling equipment · Professional crew · Unlimited cocktails (per the listing title; guests 21 and over)
You'll choose your date and complete the booking on Viator. Free cancellation under Viator's standard terms; the booking page shows the deadline.
Where Sand Key is, and the lighthouse
NOAA puts Sand Key just 7 miles west of Key West; the lighthouse’s own record puts it about 6 nautical miles southwest. Both come to about 7 statute miles, so “about 7 miles west-southwest” is a fair way to picture it. There is no bridge or ferry: you come by boat, for the reef.
The red iron lighthouse was completed in 1853, after an earlier brick lighthouse was blown away in an 1846 storm. Pieces of that older tower still lie in the shallows. The light was deactivated in 2015 and the structure was later sold, so think of it as a landmark you snorkel beside, not a working Coast Guard light.
If you are searching “Sand Key” from home, check you have the right one. Clearwater, on Florida’s Gulf coast, has a Sand Key Park with a beach, which has nothing to do with this reef.
What the reef is like underwater
Sand Key is typical Lower Keys spur-and-groove reef. NOAA describes ridges of coral, called spurs, 5 to 20 feet deep, separated by sandy grooves. On the south side the reef slopes to a ledge at about 65 feet, dropping to 90 feet in places, which is diving depth. Snorkelers stay over the shallower spurs.
Fire coral is common in several sections. It stings, which is another reason to keep your hands and fins off everything. NOAA’s general list for snorkelers in the sanctuary includes parrotfish, sergeant majors, grunts and snappers, jacks, stingrays and sea turtles; none is guaranteed on a given morning.
Be realistic about the coral. NOAA’s Sand Key page carries a warning that very high water temperatures in summer 2023 caused widespread bleaching and death, and that its coral descriptions may be out of date. That heatwave killed nearly all elkhorn and staghorn colonies around the Keys. You will still see fish, sponges and living coral heads, but not the thick branching coral of older photographs.
Other experiences
Other Key West snorkeling trips to compare
More ways to explore the area. Each listing shows its own cancellation policy.
Which trips go to Sand Key
Most reef trips do not name a reef, because the captain chooses on the day by wind, swell and visibility. Treat Sand Key as one of the options, not a promise.
| Trip | Price (checked November 2026) | Rating | What the listing says about Sand Key |
|---|---|---|---|
| Sebago Low Country Seafood Two Stop Snorkel | from $80 per person | 4.6 from 39 reviews on Viator | Two stops “such as Sand Key or another nearby location” |
| Sebago Catamaran Snorkel with Seafood Boil | from $70 per person | 4.6 from 22 reviews on GetYourGuide | Same wording as above |
| Sebago Afternoon Snorkel Sail | from $60 per person | 4.4 from 1,621 reviews on Viator | No reef named; captain selects the spot |
| Floridays Reef Snorkel & Sail | from $79 per person | 4.7 from 569 reviews on Viator | No reef named; several reefs north and south of the island |
| Classic Harbor Line schooner day sail | from $79 per person | 4.8 from 13 reviews on GetYourGuide | A 1.5-hour sail that names Sand Key reef among its sights; no snorkeling |
Read our Sebago afternoon review and our Floridays review for what the trips are like on board.
The one way to ask for Sand Key by name is a private boat. Fury’s FAQ says its private charters can stop at Sand Key, and the captains on most private trips build the day around you. Weather still decides, so ask when you book and accept the captain’s call on the day. Our private snorkeling charters page compares the options.
Rules at Sand Key
Sand Key is a 286-acre Sanctuary Preservation Area in the Florida Keys National Marine Sanctuary. Its edge is marked by yellow buoys 30 inches across. Inside it:
- No fishing of any kind and no taking or keeping any marine life, shells included.
- No touching or standing on coral, living or dead. If you get tired, float on your back.
- No anchoring on coral, and no anchoring where a mooring buoy is free. Sand Key has maintained mooring buoys, which is why tour boats tie up there.
Reef-safe sunscreen is not a Key West law (the city’s 2019 ban never took effect after the state preempted it in 2020), but NOAA recommends mineral sunscreen and a rash guard, and operators such as Fury require reef-safe sunscreen on board.
Getting the most from a Sand Key trip
Winter cold fronts bring wind and rougher seas, and a captain who cannot reach Sand Key comfortably will take you somewhere calmer, which is the right call. If your heart is set on this reef, give yourself spare days. Fury’s policy is typical: its boats do not leave in unsafe weather, and the company tries to rebook you during your stay.
Plan the timing around the boat ride. Floridays describes its reef trip as about an hour out, about an hour at the reef and about an hour back, and Fury says snorkel time on its reef trip is roughly 30 to 60 minutes. So a three-hour ticket buys you less than an hour in the water. Check in early: Fury asks guests to arrive at least 30 minutes before the printed time with photo ID, and Sunset Watersports asks for 60 minutes on its morning trip.
Dress for the season. NOAA’s harbour gauge averages about 72.5°F in January, and Fury says winter reef water can dip into the mid-60s and that January and February guests may want the wetsuits it provides. In summer the same gauge averages well into the 80s. Pack a towel, a refillable water bottle and a hat, as Fury suggests, and keep the alcohol for the ride home: several operators serve drinks only after snorkeling.
NOAA suggests a snorkel vest over a pool noodle, and Floridays and Fury both say they hand out flotation gear; wear it even if you swim well. Bring a mask that fits if you have one. For the wider reef line, see our best snorkeling spots guide, and for Sand Key’s neighbours, the Eastern Dry Rocks and Rock Key guide.
Frequently asked questions
How far is Sand Key Lighthouse from Key West?
About 7 miles. NOAA says just 7 miles west of Key West, and the lighthouse’s own record says about 6 nautical miles southwest, which is about 6.9 statute miles.
Is the Sand Key Lighthouse still working?
No. The 1853 iron tower was deactivated in 2015 and later sold, so it stands as a landmark over the reef, not a working light.
Does Key West have a lighthouse?
Yes, two you can see. The Key West Lighthouse on Whitehead Street, completed in 1848, is now a museum run by the Key West Art and Historical Society. The old Sand Key Lighthouse stands offshore on the reef about 7 miles out.
Can you snorkel at Sand Key?
Yes, from a boat. The coral spurs are 5 to 20 feet deep. Group trips choose the reef on the day, so Sand Key is possible on many reef trips but guaranteed on none we review.
Is there a Sand Key reef map?
NOAA’s sanctuary pages and its app show the boundaries of Sand Key’s preservation area. On the water, yellow buoys 30 inches across mark its edge.
Pick your morning or afternoon
Reef trips leave Key West most days of the year. Wind decides which reef the captain chooses, so check your date and book with free cancellation where you can.
Check dates and prices