Sikmogil, or Arbor Day, is observed in South Korea every April 5. Established in 1949 by the first President Rhee Syng-man, the holiday was created to combat deforestation resulting from the Korean War. Although it lost its official holiday status in 2006, it continues to be celebrated by many South Koreans. On this day, citizens are encouraged to plant trees that are suitable for their local climate, emphasizing the importance of the country's forestry. Sikmogil coincides with Hanshik, the Cold Food Festival, on non-leap years, during which Koreans honor their ancestors and visit cemeteries, often combining both celebrations by planting trees around ancestral graves.