The main objective of the study was to determine whether there is a significant relationship between the students’ perceptions on the use of portfolio assessment and their performance in Trigonometry. The respondents were 100 students from St. Mary’s College of Bansalan, Davao del Sur. The researcher employed descriptive correlation and used a researcher-made validated survey questionnaire for data gathering. Results revealed that the students’ perceptions on the use of portfolio assessment were not significantly related to their performance in Trigonometry. Thus, there are other factors that contributed to the performance of students in Trigonometry. It is recommended that school administration and teachers should take further initiatives to make a continuous move on implementing portfolio assessment in college instruction especially in Trigonometry subject and students should maintain or improve their performance by doing desirable study behaviors and learning strategies. Other academic performance-related variables like study habits, learning strategies and academic related skills should be studied.