Is the Hecate Strait rough? What to expect on the crossing
Often, and badly in winter. Hecate Strait is wide but shallow, and the BC Ferries crossing to Haida Gwaii takes about 7 hours. Wikipedia, citing a 1992 marine weather hazards manual produced with Environment Canada, says winter storm swells commonly reach 8 to 10 m in the southern strait.
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Strait · British Columbia · Reputation among passengers: among the roughest stretches of water crossed by passenger ships.
- Low
- Moderate
- High
- Very high
Roughness summarises typical reported conditions for this crossing, not a forecast for any given sailing.
Shallow strait, steep wind waves, southeast gales
In the Nausea Index table of the 121 sea crossings we cover, the Hecate Strait is rated notorious, one of 6 in the top band. Full table: the roughest sea crossings, ranked.
Key facts
- The Hecate Strait is a strait, and passenger reports place it in the very high roughness band.
- The mechanism behind that reputation: Shallow strait, steep wind waves, southeast gales.
- Conditions are reported roughest in January, November and December.
- The calmest months are usually July and August.
Why is the Hecate Strait so rough?
Hecate Strait is about 140 km wide at its southern end, about 48 km wide in the north, and from 200 m deep in the south to 25 m deep east of Rose Spit. Wikipedia, citing a 1992 marine weather hazards manual, says the shallow water lets short, steep waves develop quickly, and lists frequent southeast gales. A 1985 wave study for Fisheries and Oceans Canada, based on buoy records from 1982 to 1984, found a maximum local fetch of 150 nautical miles, the complete length of the strait, and strong south to southeasterly winds in winter. At its Hecate Strait buoy, significant wave height was above 3 m in about 37 percent of the observations and above 5 m in about 8 percent from November to March.
When is the Hecate Strait roughest?
The 1985 wave study says strong south to southeasterly winds predominate in winter and weaker north to northwesterly winds in summer. In its 1982 to 1984 records the Hecate Strait buoy had a mean significant wave height of about 3.0 m in winter, 2.2 m in spring, 1.9 m in autumn and 1.1 m in summer, and the long-term records of the North and South Hecate Strait buoys from Fisheries and Oceans Canada show the same pattern, with the highest waves from November to February and the lowest from June to August. BC Ferries' route overview sets five round trips a week from July 1 to Labour Day and a minimum of two a week for the rest of the year.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Roughest | Rough | Rough | Rough | Mixed | Mixed | Calm | Calm | Mixed | Rough | Roughest | Roughest |
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: About 7 hours
Roughest stretch: The open strait, away from the Haida Gwaii and mainland shores
Midship on a low deck. The crossing is about 7 hours, so the seat matters for most of the day.
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The crossings that cross it
| Route | Typical duration | What to know |
|---|---|---|
| Prince Rupert to Skidegate (BC Ferries) | about 7 hours | Route 11, 93 nautical miles, sailed by the Northern Adventure or the Northern Expedition. BC Ferries' route overview sets five round trips a week from July 1 to Labour Day. |
| Skidegate to Prince Rupert (BC Ferries) | about 7 hours | The same crossing eastbound. Outside summer the route has a minimum of two round trips a week. |
What helps on this crossing
- Choose summer if you can. In 1982 to 1984 the Hecate Strait buoy averaged about 1.1 m in summer against about 3.0 m in winter, and the BC Ferries route overview sets its most frequent sailings from July 1 to Labour Day.
- Sit midship on a low deck for the whole 7 hours, keep your eyes on the horizon and put your phone away. Short, steep waves jolt more than they roll, so brace your feet and keep your head against a fixed headrest.
- Check the marine forecast for southeast gales before you sail. Wikipedia, citing a marine weather hazards manual, lists frequent southeast gales on this strait, and the 1985 study found strong south to southeasterly winds in winter.
For the full toolkit see the seasickness guide, or what to do once it has already started. For what the trials actually say about the oldest trick on that list, see the verdict on looking at the horizon. If the rocking follows you ashore afterwards, that is land sickness, which is normal, and it passes.
Frequently asked questions
Is Hecate Strait rough in July?
July is among the calmest months. In 1982 to 1984 the Hecate Strait buoy had a mean significant wave height of about 1.1 m in summer against about 3.0 m in winter, and the long-term records of the North and South Hecate Strait buoys put July among the lowest months. BC Ferries' route overview sets five round trips a week from July 1 to Labour Day.
Is Hecate Strait rough in January?
January is among the roughest months. From November to March in 1982 to 1984 the Hecate Strait buoy measured significant wave height above 3 m in about 37 percent of the observations and above 5 m in about 8 percent, and the long-term buoy records put January at the top. Wikipedia, citing a marine weather hazards manual, says winter storm swells commonly reach 8 to 10 m in the southern strait.
Why is Hecate Strait so rough?
It is wide but shallow, only 25 m deep east of Rose Spit, and Wikipedia, citing a marine weather hazards manual, says the shallow water lets short, steep waves develop quickly. The 1985 wave study found a maximum local fetch of 150 nautical miles along the strait, with strong south to southeasterly winds in winter.
How long is the BC Ferries sailing from Prince Rupert to Skidegate?
BC Ferries' route overview gives Route 11 as 93 nautical miles with a crossing time of 7 hours. The vessels are the Northern Adventure and the Northern Expedition.
Other crossings
Sources & further reading
- https://en.wikipedia.org/wiki/Hecate_Strait
- https://waves-vagues.dfo-mpo.gc.ca/Library/92326.pdf
- https://www.bcferries.com/web_image/h9f/h78/8798786519070.pdf
- https://www.meds-sdmm.dfo-mpo.gc.ca/isdm-gdsi/waves-vagues/index-eng.htm
- https://www.meds-sdmm.dfo-mpo.gc.ca/isdm-gdsi/waves-vagues/formats-eng.html
Sea conditions described here are typical patterns drawn from published marine and operator information as of July 2026, not a forecast: conditions on any given sailing depend on the weather that day, and any month can deliver a calm crossing or a bad one. Route 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.