National Foundation Day, known in Korean as Gaecheonjeol, commemorates the legendary founding of the Korean nation by Dangun Wanggeom in 2333 BCE. The term “Gaecheon” means “the day heaven opened,” symbolizing the beginning of Korean civilization.

The holiday reflects Korea’s deep historical roots and cultural continuity. Official ceremonies are held across the country, and the national flag (Taegeukgi) is displayed on public buildings and private homes. The day emphasizes national identity, heritage, and pride in Korea’s long-standing history.

National Foundation Day is designated as an official public holiday in Korea. Government offices, schools, and most businesses are closed. If the date falls on a weekend, a substitute holiday may be observed.

For international readers, National Foundation Day can be compared to national origin or founding myth commemorations observed in other countries. It combines mythology, history, and modern national symbolism.

Holiday Information

Name: National Foundation Day (Gaecheonjeol)
Date: October 3, 2026
Type: National Public Holiday
Public Holiday: Yes
Theme: National Origin & Historical Identity
Observed By: Republic of Korea