This study aimed to assess the outcomes of students' learnings in terms of knowledge gained and skills acquired from three types of on-farm instructional program, factors influencing the implementation of the on-farm instructional program, and the degree of students' involvement in activities or responsibilites as perceived by students, teachers, and administrators who were involved in the conduct of the on-farm instructional program of vocational agriculture in Thailand. Respondents were 406 students, 154 teachers, and 127 administrators from 16 selected agricultural colleges throughout the country under the Department of Vocational Education, Ministry of Education, Thailand. Data were gathered through a structured questionnaire, and were analyzed using frequency counts, means, standard deviation, percentage, range, rank, T-test, Chi-square test, analysis of variance, and Scheffe' range test. Students and teachers were only moderately involved in the conduct of the on-farm instructional program while administrators had higher ratings. All respondents perceived that the students' knowledge and skills were best learned and most developed through the college demonstration farm, followed by the student experimental project, and the supervised farming project.