When is International Mountain Day in United States?

December 1, World AIDS Day December 1, Rosa Parks Day December 1, First Sunday of Advent December 2, Cyber Monday December 2, International Day for the Abolition of Slavery December 3, International Day of Persons with Disabilities December 5, International Volunteer Day for Economic and Social Development December 5, World Soil Day December 6, St Nicholas Day December 7, International Civil Aviation Day December 7, Pearl Harbor Remembrance Day December 8, Feast of the Immaculate Conception December 9, World Genocide Commemoration Day December 9, International Anti-Corruption Day December 10, Human Rights Day December 11, International Mountain Day December 12, Feast of Our Lady of Guadalupe December 13, Friday the 13th December 13, National Guard Birthday December 15, Bill of Rights Day December 17, Pan American Aviation Day December 17, Wright Brothers Day December 18, International Migrants Day December 18, Arabic Language Day December 20, International Human Solidarity Day December 21, December Solstice December 24, Christmas Eve December 25, Christmas Day December 26, Kwanzaa (first day) December 26, Chanukah/Hanukkah (first day) December 26, Day After Christmas Day December 31, New Year's Eve