For most cruisers continuing west out of French Polynesia, the Cook Islands are the next stop on the classic Pacific circuit — and the passage there is a genuine offshore leg, not a short island hop. Unlike the shorter, more forgiving inter-island legs within French Polynesia, this crossing puts real open ocean under the keel with limited bail-out options along the way. Planning it properly means knowing where to depart from, how far you are actually going, what weather window to target, and whether a Suwarrow stop makes sense for your boat and timeline.
The Typical Departure Point
Most westbound cruisers leave French Polynesia for the Cook Islands from Bora Bora, the westernmost of the main Society Islands and the natural last stop before open ocean. Some boats depart from Maupiti, a smaller island slightly further west, but Bora Bora’s better services, fuel availability, and formal clearance facilities make it the departure point of choice for the large majority of the fleet. See our Bora Bora sailing guide for lagoon entry, mooring, and the departure clearance process itself.
Distance and Passage Time
The direct passage from Bora Bora to Rarotonga, the Cook Islands’ main island and principal port of entry, covers roughly 500-600 nautical miles depending on the exact routing and any waypoint stops. Sailed at typical cruising speeds, most boats complete the direct crossing in approximately four to five days, conditions permitting — faster for well-canvassed boats in strong trades, longer if the wind is light or a routing detour is needed around developing weather.
This is meaningfully longer than most legs within French Polynesia itself, and it should be planned and provisioned like the offshore passage it is: full weather routing, safety gear checked, and a realistic assessment of your crew’s readiness for several consecutive days and nights at sea with no easy bail-out option along the direct route.
Weather Windows for the Crossing
This leg is sailed almost exclusively during the May-October trade wind season, for the same reasons that govern most French Polynesia-to-Cook Islands traffic: more consistent easterly-to-southeasterly trade winds, and clearance of the official November-April cyclone season that affects both French Polynesia and the wider South Pacific basin. Departing outside this window meaningfully increases both routing uncertainty and cyclone exposure, and is not something most cruisers or their insurers are willing to accept.
Within the dry season, the same seasonal wind-direction pattern that applies across French Polynesia holds here too — expect predominantly easterly to southeasterly trades, generally making this a favorable reaching or broad-reaching passage rather than a hard beat, though individual weather systems can temporarily disrupt the pattern. See our French Polynesia weather routing guide for the fuller seasonal breakdown and the forecasting resources used to pick an actual departure date.
Before departing: file an advance notice of arrival with Cook Islands Customs (commonly required at least 48 hours ahead of your estimated arrival time), fly the yellow Q flag on approach, and have your zarpe, passports, crew list, and vessel documentation ready for inspection at your first Cook Islands port of entry.
Suwarrow: A Stopover Option, Not a Default Route
Roughly partway along a more northerly routing between French Polynesia and the central Cook Islands lies Suwarrow, a remote, largely uninhabited atoll that is part of the Cook Islands’ Northern Group and managed as a national park. It is not a shortcut — routing via Suwarrow generally means a slightly different track than the direct Bora Bora-Rarotonga rhumb line — but it is a well-known and popular stop for cruisers with the time and routing flexibility to include it.
What to know before planning a Suwarrow stop:
- Suwarrow is not an official Cook Islands port of entry. Visiting requires advance arrangement — typically an application to Cook Islands border agencies for a vessel to arrive at a location outside a designated customs port, plus separate permission from the resident National Environment Services park administrator.
- The atoll is only staffed and open to visiting yachts for part of the year, roughly the dry season months when the resident park caretakers are in residence; it is unattended and effectively closed to visitors the rest of the year. Confirm current-season dates directly before planning a stop, as staffing windows can shift year to year.
- Anchorage is limited to one specific area inside the lagoon, and a modest anchorage fee is typically payable to the park administration for the length of your stay, generally capped at a set number of days.
- Services are essentially nonexistent — no fuel, no provisioning, no facilities beyond the caretakers’ presence. Boats stopping at Suwarrow should already be fully provisioned and fueled for the remainder of the passage to Rarotonga or another Cook Islands port.
For cruisers without the extra time or routing flexibility, the direct Bora Bora-Rarotonga passage remains the default and by far the more common choice.
Preparing the Boat and Crew for the Crossing
Because this leg runs several days without a realistic bail-out point along the direct route, preparation should match an offshore passage rather than an inter-island hop:
- Fuel and range: confirm your motoring range under power alone covers a realistic worst-case scenario of several days of light or contrary wind, and top up fully in Bora Bora before departure rather than counting on favorable conditions throughout.
- Water and provisions: budget for the passage taking longer than the average four to five days in case of a slow start or a routing detour around weather, and provision accordingly rather than to the minimum expected duration.
- Safety gear and communications: confirm EPIRB, liferaft, and jacklines are in passage-ready condition, and have a satellite communications option for weather updates and, if needed, emergency contact — VHF range from open ocean on this route is limited to other vessels in the immediate area.
- Watch schedule: with no short-hop rest stops available, agree on a sustainable watch rotation before departure rather than improvising once underway.
BoatUS publishes widely used offshore passage-preparation checklists covering safety gear, communications, and float-plan practice that translate directly to a leg like this one, regardless of where the boat is flagged or insured.
What to expect en route: the passage is typically a comfortable reach or broad reach in consistent trade winds during the dry season, though squalls are a normal feature of Pacific trade wind sailing and should be expected rather than treated as unusual. Fishing is popular on this leg — trolling gear is standard equipment for many boats making this crossing, with mahi-mahi, tuna, and wahoo among the commonly caught species.
Arrival and Clearance at Rarotonga
Avatiu Harbour, on the north side of Rarotonga, is the principal Cook Islands port of entry and where most arriving yachts complete customs and immigration formalities. Berthing instructions are obtained from the harbourmaster by VHF on arrival. Expect to present ship’s papers, crew list, passports, your last port’s clearance (zarpe), and a general declaration; all crew typically remain aboard until clearance is complete. Port fees are charged per vessel length per day, and a departure tax applies per person when you eventually clear out.
After Rarotonga: Continuing the Circuit
Rarotonga is itself a stop on the wider Pacific circuit rather than an endpoint for most cruisers. From here, common onward routes continue west toward Niue, Tonga, and Fiji, or further options exist for boats routing toward American Samoa. Each of those legs has its own distance, port-of-entry, and seasonal considerations well beyond the scope of this Bora Bora-to-Rarotonga guide — plan the next leg with the same care given to this one, rather than assuming Cook Islands clearance is the final piece of Pacific-crossing paperwork.
Frequently Asked Questions
Is the Bora Bora to Rarotonga passage suitable for a first long ocean crossing?
It is a reasonable step up for crews with at least one prior multi-day offshore passage under their belt (most will already have the Marquesas-to-Tahiti leg behind them by this point). The route itself is generally not technically difficult in season, but four to five days of continuous offshore sailing with no convenient bail-out demands genuine offshore readiness in the boat, crew, and safety equipment.
Do we need to notify Cook Islands authorities before we arrive?
Yes. Cook Islands Customs generally expects an advance notice of arrival submitted a set number of hours before your estimated arrival time, even though the exact lead time and submission method can change — confirm current requirements directly with Cook Islands Customs before departing French Polynesia, since contact channels and lead-time rules are updated from time to time.
Can we stop at Suwarrow without prior arrangement?
No. Suwarrow is not an official port of entry, and stopping there requires advance permission from both Cook Islands border authorities and the National Environment Services park administration, plus awareness that the atoll is only staffed for part of the year. Arriving unannounced or outside the staffed season is not a workable plan.
What is the best month to leave Bora Bora for the Cook Islands?
Most cruisers depart within the May-October trade wind season, clear of the November-April cyclone risk. Exact departure dates within that window should be set from current forecasts rather than a fixed calendar date, since favorable weather windows shift from year to year.
How does this passage compare in difficulty to the Marquesas to Tahiti leg?
It is broadly comparable in distance and duration to the shorter direct Marquesas-Tahiti option, without the added complexity of Tuamotu atoll pass navigation along the way. Most crews who have completed the Marquesas-Tahiti passage find the Bora Bora-Rarotonga crossing a manageable next step, weather permitting.