Challenges to establishing and maintaining undergraduate research programs include how to demonstrate impact as evidence for future funding, establish eligibility criteria when resources are limited, and assess new components. To address, undergraduate researcher GPA, credit accumulation and time to graduation were evaluated longitudinally, at an urban, public, minority and Hispanic serving, commuter college.  Students who participated in undergraduate research and matched peers were also compared.  Evaluation revealed that all groups benefited from participation in undergraduate research, whether they had full or part-time status, were STEM or non-STEM majors, or participated in single or multiple semesters of research. Addition of mandatory workshops after the fourth year of the seven years of students evaluated, correlated with longer participation in voluntary undergraduate research. Longer participation correlated with higher GPAs. Students who began research with no GPA, indicating that they were first-time freshmen or transfer students, were more likely to have low GPAs during the semester of participation, suggesting that a successful semester at the college before eligibility may be an evidence-based criteria to implement.