Otsu Beach is primarily known for viewing jewel ice rather than swimming. The beach faces the cold Pacific Ocean, and water temperatures remain quite chilly year-round, making swimming uncomfortable for most visitors. During winter months when jewel ice appears, conditions are unsuitable for swimming. If visiting in summer, the water remains cold compared to beaches in warmer regions. Always check local conditions and follow any posted warnings. The beach is better suited for walking, photography, and ice viewing rather than water activities.

Jewel ice typically appears at Otsu Beach from mid-January through late February or early March, though exact timing varies yearly depending on weather conditions. The phenomenon occurs when ice chunks from the Tokachi River freeze and wash ashore, creating crystal-like formations that sparkle in sunlight. Early morning visits offer the best chance to see pristine jewel ice before it melts, especially during sunrise when the ice glows beautifully. Check local weather forecasts and recent visitor reports, as conditions change daily based on temperature and ocean currents.

Otsu Beach is located in Toyokoro, eastern Hokkaido. By car, it's approximately 2.5 hours from Obihiro or about 1 hour from Kushiro via Route 336. Free parking is available near the beach. Public transportation is limited; the nearest train station is Toyokoro Station, but it's still several kilometers from the beach, requiring a taxi. Most visitors arrive by rental car or tour bus. During jewel ice season, the parking area can fill quickly during early morning hours when photographers gather for sunrise shots.

Otsu Beach is in a relatively rural area with limited nearby amenities. The small town of Toyokoro, a few kilometers away, has some local restaurants and convenience stores for basic supplies. Accommodation options in Toyokoro are limited, mostly consisting of small inns and minshuku (Japanese guesthouses). Many visitors base themselves in larger cities like Obihiro or Kushiro, which offer more hotel choices and dining options, then make a day trip to see the jewel ice. Bringing snacks and drinks is advisable, especially for early morning visits.

Jewel ice (宝石氷) is a natural phenomenon unique to this area where clear ice chunks from the Tokachi River wash ashore and scatter across Otsu Beach. The ice forms upstream during winter, breaks apart, flows to the Pacific Ocean, and is pushed back onto the beach by waves and currents. The ice pieces are remarkably clear and transparent, resembling gemstones when sunlight passes through them. This occurs specifically here due to the combination of the Tokachi River's flow patterns and the beach's geography, making Otsu Beach one of the few places to witness this stunning natural display.