The roots of Asian/Pacific American Heritage Month can be traced back to 1976, when Jeanie Jew, president of the Organization of Chinese American Women, contacted government officials in response to the lack of Asian Pacific representation in the U.S. bicentennial celebrations that same year. The observance began in 1979 as Asian Heritage Week, established by congressional proclamation. In May 1990, the holiday was expanded further when President George Bush signed a proclamation making it month-long for that year. On October 23, 1992, Bush signed legislation designating May of every year Asian Pacific American Heritage Month.

The month of May was chosen to commemorate two significant events in history: the immigration of the first Japanese immigrants to the United States on May 7, 1843, and the completion of the transcontinental railroad on May 10, 1869 (Golden Spike Day).