If you ask our team what makes a Kimberley voyage different, most of us start with the tide. We have sailed this coast, and it is the first thing we explain to guests, because it shapes everything else: the hour you step into a Zodiac, the morning Montgomery Reef rises out of the sea, and the reason tomorrow's plan is shared on board the evening before. Here is what is happening under the ship, and how it shapes your days.
In short
Derby, at the head of King Sound, has the largest tidal range of any major port in Australia: its tides can change by more than 11.5 metres in about six hours. Across north-west Australia the average range is more than 8 metres, against less than one in the south-west. The size comes from a wide, shallow continental shelf and bays that funnel the water, and it peaks around the new and full moon.
A wide shelf, deep bays and the moon
The moon does most of the pulling. What sets the Kimberley apart is what the water meets on its way in: a broad, relatively shallow continental shelf that lets the tide build, then a coastline cut into sounds and bays that squeeze it higher still. The Bureau of Meteorology explains it in those terms, and the effect reads clearly along the coast: the mean spring range climbs from 1.7 metres at Exmouth to 9.2 metres in King Sound.
The numbers, port by port
The Bureau publishes tide predictions for four Kimberley ports, posted by the Kimberley Ports Authority. We looked at the first fortnight of August 2026, the heart of the cruising season, to show how much a single week can change.
- Derby: up to 11.92 metres at high tide this year. On 2 August the water moves 9.58 metres from one tide to the next; a week later, 4.75 metres.
- Yampi Sound, near Koolan Island: 8.43 metres on 2 August, then 3.20 metres on 9 August.
- Broome: 7.77 metres, then 2.63 metres.
- Wyndham, to the east: 6.76 metres, then 3.77 metres.
Each port measures from its own reference level, so the figure worth comparing is the change between one tide and the next.
Springs, neaps and a fortnight's rhythm
Twice a month, at the new and full moon, the moon and the sun pull in line and the tides grow: higher highs, lower lows. Around the quarter moons they pull at right angles and the range shrinks. On this coast, with two high and two low tides a day, the cycle turns roughly every fifteen days.
August 2026 shows it well. The moon is full on 29 July, and on 2 August Derby swings between 10.83 and 1.25 metres. By 9 August, just after the last quarter, it moves between 8.77 and 4.02 metres. A ten-night voyage covers about two-thirds of that cycle, so the first morning and the last show you two different coasts.
Where you see the tide at work
Montgomery Reef
This is the moment many guests come for. Montgomery Reef, Yowjab, covers about 400 square kilometres between Camden Sound and Collier Bay. As the tide falls, the edge of the reef rises several metres clear of the sea, and the water pours off its terraces in fast-running cascades. At high tide it lies almost entirely underwater. The visit is timed to the falling tide, which is why its hour changes from one sailing to the next. More on the reef itself on our Montgomery Reef page.
Rivers, mangroves and the Zodiacs
In the rivers, the tide decides where a boat can go and when. Currents run hardest on the biggest tides, and mudflats appear and disappear twice a day. Some outings use the rising water to reach deep into the mangroves of the Hunter River; others wait for the current to ease. Our guide to Zodiac cruising in the Kimberley explains how the boats themselves work.
-1400x788.webp%3F2026-08-19T08%253A15%253A54.393Z&w=3840&q=100)
Why tomorrow's plan arrives the evening before
Tide times move later each day. At Yampi Sound, the morning low tide is predicted for 07:11 on 1 August 2026 and for 11:35 a week later. An outing timed to a falling tide moves with it, so a reef visit that suits the early morning on Monday can sit close to midday the following Monday.
That is why the expedition team plans each day against the tide tables and the weather, and shares the programme at the evening briefing. The places stay on the itinerary. The hours move with the water, and once you know it, the rhythm becomes part of the pleasure.
Where a specialist makes the difference
Tide tables are public. Reading them against a particular sailing is where experience counts. Because we have sailed this coast and know how each of our partners runs its days, we can tell you before you book what a departure is likely to feel like: which days fall near spring tides, when the early starts are likely, how the ship's boats work the rivers, and which cabin suits the way you like to travel.
Then we plan everything around it, from the flights and the night before in Broome or Darwin to the moment you are home, with one person from our team looking after you the whole way.
The honest answer
- The itinerary names the places. The tide sets the hour.
- Your dates decide the tides. Predictions are published a year ahead, and the 2027 tables for the Kimberley ports are already out.
- Spring tides bring the strongest cascades at Montgomery Reef. Scientists who surveyed the reef describe them at their most powerful in spring tide periods.
- Weather and safety stay with the expedition team. Every day, on the day.
- A specialist turns the tables into a choice. We read the predictions against your dates and your ship before you commit.
On the reef
Walking on Montgomery Reef, or on any reef in Lalang-gaddam Marine Park, is prohibited, and so is anchoring in the reef channel. The Dambimangari Aboriginal Corporation asks visitors to stay off exposed coral reefs on Dambeemangaddee Sea Country. The view is from the water, and it is the better one.
Questions we are asked about Kimberley tides
How big are the tides on a Kimberley cruise?
It depends on the place and the moon. On 2 August 2026, the Bureau of Meteorology predicts a change of 7.77 metres between two tides at Broome, 8.43 metres at Yampi Sound and 9.58 metres at Derby. A week later, near the quarter moon, the same ports show 2.63, 3.20 and 4.75 metres.
Will my sailing be on spring or neap tides?
Usually both. Spring tides come about every fifteen days, close to the new and full moon, with neaps in between. A ten-night voyage covers about two-thirds of that cycle, so the range changes noticeably from the first day to the last.
Does the tide decide when we visit Montgomery Reef?
Yes. The reef shows itself as the tide falls, its edge standing several metres above the water at spring low tide, and it is mostly submerged at high tide. The visit is timed to the ebb, so its hour depends on that day's predictions.
Can we choose a sailing for the biggest tides?
To a point. Tides follow the moon and are predicted a year ahead, so we can look at the sailings you are considering and show you which days fall near spring tides. Weather and the expedition team's plan still shape each day.
Tell us the months you have in mind and we will read the tide tables for those sailings with you, then plan the rest around them. For the season itself, read the best time to cruise the Kimberley.
-1-600x400.webp%3F2026-08-18T06%253A15%253A40.420Z&w=3840&q=100)
