Ajahn Chah was born on 17 June 1918 near
Ubon Ratchathani in the
Isan region of northeast Thailand. His family were
subsistence farmers. As is traditional, Ajahn Chah entered the monastery as a novice (
sāmaṇera) at the age of nine, where, during a three-year stay, he learned to read and write. According to the 2017 biography
Stillness Flowing and other sources, Ajahn Chah took novice vows again in March 1931 under the name Samanera Cha Chuangchot. His preceptor was Phra Khru Wichit Thammaphani (Phuang), then abbot of Wat Maniwanaram, Ubon Ratchathani. As a novice, he studied Buddhist scriptures and diligently performed monastic duties, including chanting, observing precepts, and following the Dhamma curriculum for samaneras. After three years, he disrobed to assist his family on the farm due to economic necessity, like many in the agrarian Northeast, but remained committed to reordaining at age 20. On 26 April 1939 at 1:55 p.m., with his parents' permission, he was ordained as a monk (
bhikkhu) at Wat Ko Nai in Tambon That, Amphoe Warin Chamrap, Ubon Ratchathani. His preceptor was Phra Khru Inthasarakun, with Phra Khru Wirun Sutthakan as the
kammavācācariya and Phra Athi Sorn as the
anusāvanācariya. He was given the monastic name Subhaddo (meaning “well-going”). Bhikkhu Cha Subhaddo remained at Wat Kon Ok for two years, where he pursued advanced Dhamma studies and passed the third level of the Dhamma examinations, studying both independently and under monastic teachers. In 1946, following the death of his father, Ajahn Chah left the settled monastic life and chose to live as a wandering ascetic monk in the Thai
Forest Tradition. He walked across Thailand, practicing meditation and studying under various renowned teachers, including
Ajahn Mun Bhuridatta, a leading figure in the Forest Tradition. He spent time living in forests, caves, and cremation grounds, developing insight through contemplation of impermanence and death. A website devoted to Ajahn Chah describes this period: ==Thai forest tradition==