Tu Bishvat
Tu Bishvat is held on February 12. The fifteenth day of Shevat. The New Year for trees or ט"וּ בִּשְׁבָט. This event in the second decade of the month February is annual. 
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Tu B’Shevat is the birthday for trees and was originally meant to help farmers determine when the trees were mature enough for their fruits to be harvested.
The Mishnah in Rosh Hashanah says that there are four new years in the Jewish calendar: One before Passover, by which is calculated the reigns of kings; one in Elul, by which animal tithes are calculated; the familiar new year of Rosh Hashanah, which falls in the month of Tishrei; and the New Year for Trees, which takes place in the month of Shvat. Tu B’Shevat is celebrated on the 15th of Shevat on the Hebrew calendar. “Tu” is Hebrew for 15.
Similar holidays and events, festivals and interesting facts
Day of help to forest animals in Poland on February 11
Little New Year in Japan on February 13 (小正月 koshōgatsu);
World Whale Day on February 16
World Marine Mammal Protection Day and World Whale Day on February 19 (is celebrated since 1986);
Losar, Tibetan New Year on February 28
World Seagrass Day on March 1
Urban Waste Picker Day on March 1