There is no minimum size. That is the honest answer, and it disappoints almost everybody who asks.
Almost everybody searching what size boat to cross to Bahamas is hoping for a number. Thirty two feet. Thirty five. Forty. The number does not exist, because no agency publishes one. Insurers set their own limits, boat by boat, and those vary.
Still, what does exist is a set of thresholds that are regulatory rather than nautical, plus a weather pattern that decides the day for you. Get those two right and a well kept 34 ft boat can cross comfortably. Get them wrong and a 55 ft boat has a miserable, expensive morning.
How far is the crossing from Florida to the Bahamas?
Fort Lauderdale to Bimini is roughly 49 to 52 nautical miles. Miami is a shade closer at about 45 to 50. Palm Beach to West End runs around 56.
At 22 knots that is a bit over two hours, so a departure after breakfast lands you there before lunch. At a trawler’s 8 knots it is a long morning, though still a single daylight run with plenty of margin.
So range is rarely the limiting factor for anything in the 35 to 60 ft class. In practice fuel burn matters for the rest of the trip, not for the crossing itself.
How does the Gulf Stream affect a Bahamas crossing?
The Stream runs north at two to three knots, while the wind does whatever it wants. When wind blows from the north against it, the seas stand up and get close together fast.
The National Weather Service office in Melbourne publishes a Gulf Stream nomogram that puts numbers on it. It assumes the wind has been blowing for 18 hours. On that basis, 15 knots of northeast wind builds seas of about 9 ft, and 20 knots northeast about 12 ft.
Twelve feet is not a size problem. It is a stay home problem. Indeed, there is no boat in this size range that makes that pleasant.
By contrast, an east or southeast breeze under 12 knots gives you a crossing your guests will actually enjoy. Consequently the useful skill is patience, not displacement.
What boat size changes the rules for crossing to the Bahamas?
Two lengths change your paperwork and your costs. Neither has anything to do with seaworthiness.
Thirty feet. So at 30 ft and above you need a CBP annual decal to clear back into the United States. It runs about $38 a year.
Fifty feet. This one bites harder. Above 50 ft the Bahamas require AIS, switched on at all times, and the published fine is $1,000. You also land in a higher cruising permit tier and a higher fishing permit tier.
Notice what that means. If you are shopping in the 46 to 55 ft band, crossing the 50 ft line costs you real money every year you take it across. It is worth knowing before you make the offer rather than after.
How much does a Bahamas cruising permit cost in 2026?
A 30 day permit costs $150 for a boat of 30 ft or less, $250 from 30 to 50 ft and $350 from 50 to 100 ft. Twelve months costs $500 up to 50 ft and $1,000 above it.
The fee structure was revised on 1 April 2026, and the cruising permit rates actually came down. Meanwhile the fishing permit was pulled out as a separate charge at the same time.
| Permit | 30 ft or less | Over 30 to 50 ft | Over 50 to 100 ft | Over 100 ft |
|---|---|---|---|---|
| 30 day cruising | $150 | $250 | $350 | $600 |
| 6 month cruising | $300 | $750 | $2,000 | |
| 12 month cruising | $500 | $1,000 | $3,000 | |
| Fishing, 30 days | $100 | $300 | ||
Two smaller charges sit on top. A passenger tax of $20 a head once you are carrying more than three people aged six or over who do not live in the Bahamas. And an anchorage fee if you are not tied up at a marina, paid once per permit: for a boat up to 50 ft that is $50 on a 30 day permit, $150 on a 6 month and $200 on a 12 month.
If you are choosing between two boats and one of them is over 50 ft, I am happy to put the annual difference in writing before you decide.
What should you check before you cross to the Bahamas?
This list has nothing to do with length. It is what separates a boat I would take across from one I would not.
- Fuel range with a real reserve. Not the brochure figure. Instead work it at cruise, loaded, and decide what reserve you want still in the tank when you arrive
- A backup way home. Twin engines, or a single engine with a real plan if it quits
- An anchor you trust. Anchorages over there are shallow and the bottom varies a lot
- Communications beyond a phone. A working VHF, and increasingly a satellite messenger. Also, cell coverage dies well before Bimini
- A tender or a plan without one. Plenty of the good stops have no dock for a 45 footer
- Recent service records. A raw water impeller you cannot date is a bad thing to think about at mile 25
Three of those six are about redundancy. That is the honest reframing of the question. It is not what size boat to cross to Bahamas, it is how many single points of failure you are willing to carry.
Buying a boat with the Bahamas in mind
Tell me where you want to go and how often, and I will tell you what that actually requires. Range, draft, tender, permits and the annual cost difference above and below 50 ft. Then we look at boats.
How much draft is too much for the Bahamas?
There is no single maximum. What your draft decides is which banks, cuts and anchorages are open to you, and if any dimension deserves the attention people give to length, it is this one.
The Bahamas bank is shallow, and the good anchorages are shallower still. A boat drawing 3 ft goes places a boat drawing 5 ft simply cannot, and that difference shapes the whole trip.
On a Bahamas boat, ask what it draws before you ask about the engines. Draft decides where you can go over there.
Frequently asked questions about crossing to the Bahamas
Can you cross to the Bahamas in a 30 ft boat?
Yes, and people do it constantly out of Miami and Fort Lauderdale. Rather, the requirement is a settled forecast, a tested boat and honest fuel math. A 30 footer on a good day beats a 50 footer on a bad one.
How long does the crossing take?
Fort Lauderdale to Bimini is about 50 nautical miles, so roughly two and a quarter hours at 22 knots and six hours at 8 knots. Plan the departure around the forecast rather than the clock.
Do I need AIS?
Above 50 ft the Bahamas require it, with a fine attached. Below that it is optional, though I would carry it anyway. Besides, shipping traffic in the Stream is heavy and AIS is how you see it before you see it.
What does a cruising permit cost in 2026?
For a boat between 30 and 50 ft, a 30 day permit runs $250, six months runs $300 and twelve months runs $500. Above 50 ft those become $350, $750 and $1,000. Fishing is separate now, at $100 under 50 ft and $300 at 50 ft and over. Confirm with Bahamas Customs before you go.
What size boat should you buy for Bahamas trips?
When somebody asks me what size boat to cross to Bahamas, what they usually mean is whether the boat they are looking at is enough boat. Fair question, and a better one.
The answer depends on where they want to go, how many nights they want to stay, how shallow the anchorages are, and whether they are the sort of person who will wait three days for the right window. Notably, none of that is on a spec sheet.
Send me the boat you are considering and the trip you actually want. I will tell you where it fits and where it will frustrate you, including the parts a listing will never mention.
Frank Christopher, 954 504 8367.
Permit figures checked against the Bahamas Customs pleasure vessel pages on 30 October 2026. The CBP decal covers a calendar year, and the fee is $38.04 under the adjustment CBP made effective 1 October 2026. Rates move, so verify against the issuing agency before you rely on any number here.
