A volcanic island reachable from the mainland only by ferry, Ulleungdo is known for Korea's heaviest snowfall — traditional houses here even have "udegi," snow-blocking walls built specifically for it. Here's a breakdown of Ulleungdo's distinctive winter weather, combining snowstorms, strong wind, and sea fog, and seasonal tips.
Ulleungdo is a volcanic island rising from the middle of the East Sea, shaped by steep terrain and the warm East Korea Warm Current. The current keeps winter temperatures milder than the mainland, but cold Siberian air picking up heavy moisture over the warm East Sea often slams into the island's steep slopes and produces heavy snowstorms.
During multi-day cold snaps, 20cm or more of snow is routine, and over a meter can fall at once — reportedly more than even Gangwon's mountain areas. Traditional houses still have "udegi," snow-blocking walls built to keep passage clear even when snow piles up to the eaves.
Beyond heavy snow alone, snowstorms can combine with strong wind, sea fog, and wave overtopping (waves surging over breakwaters or roads) at the same time, making it feel riskier than heavy snow elsewhere.
Strong winter winds and high waves often cancel ferries, and when cancellations stretch on for days, the island can become effectively isolated. If you're planning a winter visit, build extra time into your schedule.
Spring and autumn call for caution around unpredictable wind and waves, while summer, thanks to the warm current, tends to be milder and more pleasant than the mainland, drawing many visitors. Winter frequently combines heavy snow with strong wind, fog, and waves, so always keep ferry cancellation in mind. For general season-by-season tips, see the seasonal outdoor guide.
If you're planning a winter visit, build a day or two of buffer into your schedule for ferry cancellations, and check marine advisories and cancellation status the day before departure. On days with heavy-snow or strong-wind advisories, avoid coastal walking paths and breakwaters, and check whether hiking trails are closed. For general threshold-by-threshold guidance on UV, feels-like temperature, and fine dust, see what to do.
Since ferry cancellations directly affect your travel plans here, search for and add "Ulleung-eup" in sanCheck before your trip to track the weather trend days ahead and adjust your schedule accordingly.