Puget Sound does not hibernate. On a calm December morning, the Sound can look and feel better than any summer weekend: no ferry wake from the recreational fleet, no ski boats, no jet skis, and a dusting of fresh snow on the Olympics. Winter boating rewards the prepared and punishes the complacent in equal measure. The working version of the off-season is below.
What changes in winter
Water temperature drops to 44–50°F (7–10°C). This is the working most-important variable. Cold shock — the involuntary gasp reflex when a body enters cold water — is a drowning hazard at any water temperature below 60°F. At 45°F, functional swimming time before incapacitation is roughly 30–60 minutes for an unprotected swimmer. This is not a slow-motion emergency; it is a very fast one. See Cold Water Safety for the working framework on hypothermia phases and rescue timing.
Daylight is limited. Seattle sees about 8.5 hours of daylight at the winter solstice. Plan passages for full daylight with margin. Night passages in winter are for the experienced and well-equipped — see Night Sailing for the working framework.
Weather windows are shorter. The PNW gets most of its precipitation between November and March. A three-day window of calm is a working gift; plan around it rather than assuming it will hold. Frontal systems can deteriorate in hours, not days.
Traffic is negligible. This is the working upside. Anchorages, fuel docks, and marine staff are almost entirely available. Friday Harbor in February, Sucia Island in November, Hood Canal in January — empty docks and anchorages that fill in summer.
Gear that matters more in winter
Drysuit or quality foul-weather gear with thermal base layers. Staying dry is the first line of defence. Spray, rain, and condensation accumulate. A damp crew is a slow crew; a cold wet crew is a dangerous one.
EPIRB and PLB. In summer, help is rarely more than 30 minutes away. In winter, the boat may be the only one out. A registered EPIRB or PLB is not optional equipment. See Marine Safety Equipment for the working offshore equipment list.
Reliable engine cooling and winterised systems. Raw-water-cooled engines can freeze in extended cold snaps. Freshwater coolant prevents this; raw-water engines need careful attention after cold nights, particularly for boats trailered between sailings.
Propane or diesel cabin heating. Propane heaters (Force 10, Dickinson) or diesel heaters (Webasto, Espar) are worth their weight. A cold, damp cabin destroys crew morale and impairs working judgement.
Charged batteries or a generator. Winter anchorages mean minimal solar input. Plan the power budget accordingly — radar, navigation lights, cabin heater, refrigeration, the chartplotter all draw current and the days are short.
Working winter routes
South Puget Sound. The Nisqually Delta area, Zittel’s Marina, and the anchorages off McNeil Island see almost no traffic in winter. Crabbing is excellent November through March. See the South Puget Sound guide.
Hood Canal. One of the PNW’s more dramatic waterways. The Skokomish Delta anchorage is spectacular in low winter light. The Hood Canal Floating Bridge is open year-round. See the Hood Canal guide.
Whidbey Island circumnavigation. A working 70-mile circuit, mostly protected from ocean swell. Deception Pass is dramatic in winter conditions — time the current and go. See the Whidbey Island guide.
San Juan Islands. Possible in winter for experienced crews in well-equipped boats. Friday Harbor in February has working empty mooring buoys and the standard boat traffic reduced to a few committed cruisers. The trade-off is the open-water passages (Rosario Strait, San Juan Channel) in winter conditions. See the San Juan Islands guide.
Working rules for winter passages
- File a float plan with someone ashore before every trip. Update if the plan changes underway.
- Check the NOAA marine forecast (VHF WX-1 through WX-3) before departure and again underway. See Reading Marine Weather.
- Know the nearest haul-out and harbour of refuge for every leg.
- Wear the life jacket. In summer the case for skipping it is weak; in winter, it is non-existent.
- Don’t go alone unless very experienced and very well-prepared. Two-boat winter cruising is the working standard.
Closing notes
Winter boating in the PNW is not extreme adventurism — it is just boating with the volume turned down and the stakes turned up. The boats that go in February belong to the working sailors who have prepared properly: drysuits aboard, EPIRB registered, heater fuel topped up, weather window confirmed, float plan filed.
Go prepared and the off-season produces some of the best days on the water of the cruising year. The Olympics reflecting off a flat-calm Sound on a December morning, with the entire bay’s worth of anchorages to choose from, is the working photograph the off-season is remembered by.
Related: Cold Water Safety · Marine Safety Equipment · Reading Marine Weather · Night Sailing · PNW Spring Commissioning Checklist · Cruising Puget Sound