Is the Geelong to Devonport (Spirit of Tasmania) crossing rough?
Yes, often enough that Tasmanians treat it as part of the trip. The Spirit of Tasmania crosses Bass Strait between Geelong and Devonport in about 9 to 11 hours, normally overnight, covering roughly 448 km. Bass Strait is a shallow shelf between two oceans, and Southern Ocean swell shortens and steepens as it crosses; the overnight format means you meet it in a bunk, which is the best place for it.
Bass Strait · about 9 to 11 hours, normally overnight · Reputation among passengers: has a long-standing reputation for rough passages.
Service status, September 2026
Two things older guides get wrong: sailings have departed Geelong, not Melbourne, since 2022, though searchers still use the old phrasing; and the new, larger ships Spirit of Tasmania IV and V are scheduled to enter service from late October 2026, with a planned changeover pause in sailings in the final week of October 2026. Check the operator's schedule around those dates.
- Low
- Moderate
- High
- Very high
Roughness summarises typical reported conditions on this route, not a forecast for any given sailing.
Ocean swell shortening over a 60 m shelf
Key facts
- The Geelong to Devonport (Spirit of Tasmania) crossing takes about 9 to 11 hours, normally overnight, operated by Spirit of Tasmania.
- It crosses the Bass Strait, and passenger reports place the route in the high roughness band.
- What drives the rough days: Ocean swell shortening over a 60 m shelf.
- Conditions are reported roughest in June, July and August.
- The calmest months are usually January, February, March and December.
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Why the Geelong to Devonport (Spirit of Tasmania) crossing gets rough
Bass Strait averages only around 60 metres deep, so the long swell rolling in from the Southern Ocean and Tasman Sea stands up short and steep over the shelf, especially when westerly fronts drive wind across it. The winter months bring the strongest fronts. The ships sail almost every night regardless, and the roughest water falls mid-strait in the middle of the night.
This route crosses the Bass Strait. For the full picture of that water, every crossing on it and what drives its reputation, see is the Bass Strait rough?
When it's worst, month by month
June to August fronts make winter the roughest season, with April to September all carrying raised odds; December to March offers the calmest average nights. Daytime sailings run in some months between September and April.
| Roughest water in Jan | Roughest water in Feb | Roughest water in Mar | Roughest water in Apr | Roughest water in May | Roughest water in Jun | Roughest water in Jul | Roughest water in Aug | Roughest water in Sep | Roughest water in Oct | Roughest water in Nov | Roughest water in Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mixed | Mixed | Mixed | Rough | Rough | Roughest | Roughest | Roughest | Rough | Rough | Rough | Mixed |
Typical seasonal pattern, not a forecast. Any month can deliver a calm crossing or a bad one. Check the marine forecast for your sailing date. Select a month to see every sea and ferry crossing ranked for it.
Where to be on board
Front to back
- Bow (front)Avoid
- MidshipBest
- Stern (aft)OK
The crossing: 9 to 11 hours
Roughest stretch: Mid-strait, furthest from both shores, overnight
Book a cabin midship on a lower deck rather than a recliner; the mid-strait hours fall around the middle of the night.
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What helps on this crossing
- Take a cabin over a recliner and choose midship, low; on a rough night this is the whole game.
- Eat early after boarding at Geelong; the open strait arrives later in the evening.
- Be horizontal before the mid-strait hours rather than toughing it out in the lounges.
- Winter travellers with flexible dates can trade a frontal-passage night for the calmer one behind it.
- Around late October 2026, check the sailing schedule: the fleet changeover pause and new ships change the timetable.
For the full toolkit see the seasickness guide, or what to do once it has already started. Choosing between a fast catamaran and a conventional ship elsewhere too? The physics is the same everywhere: see the catamaran guide. If the rocking follows you ashore afterwards, that is land sickness, which is normal, and it passes.
Frequently asked questions
How rough is the Spirit of Tasmania crossing?
Bass Strait has an honest reputation: its shallow shelf shortens ocean swell into steep seas, and winter fronts produce genuinely rough nights. Summer crossings are often reasonable. The overnight format works in your favour, since the roughest water passes while you are lying down, which is the position motion is easiest to tolerate.
Does the ferry leave from Melbourne or Geelong?
Geelong. Sailings moved from Melbourne's Station Pier to the purpose-built Geelong terminal in 2022, though many people still search and talk about the Melbourne ferry. The Devonport end is unchanged.
What is changing with the new ships in 2026?
Spirit of Tasmania IV and V, larger new-generation ships, are scheduled to enter service from late October 2026, with a planned pause in sailings during the changeover in the final week of October 2026. Travellers booked around those dates should watch the operator's schedule updates.
Should I take seasickness medicine for Bass Strait?
It is a common enough question that pharmacists near both terminals answer it weekly; let one of them, or your doctor, advise for your situation. Two facts help: the crossing is overnight, about 9 to 11 hours, and most motion sickness medicines are labelled for use before boarding.
Other ferry routes
Sources & further reading
Your next question, probably
Where on the ship should you be?
Which cabins move least, and what to do if you already booked one
Not your question? What actually works at sea?Sick right now, mid-crossing?Still rocking after you land?
Conditions described here are typical patterns drawn from published marine and operator information as of September 2026, not a forecast: any month can deliver a calm crossing or a bad one, and schedules, vessels and operators change. Route, vessel and operator names are trademarks of their respective owners; Dizzout is not affiliated with or endorsed by them. Seasickness sensitivity varies from person to person; this page is informational and not medical advice.