From Feb 14, 2026 to Feb 18, 2026, the corresponding solar term in the Nijūshi Sekki (24 solar terms) is 立春(Rissyun), and the corresponding microseason in the Shichijūni Kō (72 microseasons) is 魚上氷(Uo kori wo izuru).

What Is “Uo kori wo izuru” (魚上氷)?

"Uo kōri wo izuru" (魚上氷, Fish Emerging from the Ice) is one of Japan's Shichijūni Kō (72 microseasons) and corresponds to the final microseason of Risshun (立春, "the beginning of spring") within the Nijūshi Sekki (24 solar terms). It is traditionally observed around February 14 to 18 each year. The phrase means "the time when fish appear, as if leaping up through cracks in the ice." It is known as a beautiful seasonal expression that captures the gradual easing of the harsh winter cold and the first subtle signs of spring reaching the waterside. The Shichijūni Kō originated from an ancient Chinese calendar system and was later adapted to suit Japan's natural environment and climate. Among these microseasons, "Uo kōri wo izuru" is especially appreciated for the delicate sense of transition it conveys between winter and spring. As the ice on rivers and ponds begins to thaw and fish become more active beneath the water, the scene comes to symbolize the stirring of life and the arrival of spring. In recent years, growing interest in the Shichijūni Kō and traditional Japanese seasonal expressions has brought renewed attention to "Uo kōri wo izuru" in haiku, Japanese cultural arts, and seasonal greetings. The phrase beautifully reflects a distinctive aspect of Japanese culture: the careful observation of nature and the expression of even the slightest seasonal changes through words. As an elegant seasonal term that quietly announces the beginning of spring, it continues to be cherished by many people.

List of Japan’s 72 Microseasons