The impact and benefits of undergraduate research experiences (URE) in the first two years of post-secondary education have been well documented. Early exposure to research experiences is effective in recruitment, diversity and persistence in Science, Technology, Engineering and Mathematics (STEM) degree programs, particularly among underrepresented minority students. The Summer Undergraduate Research Experience Course (SUREC) presented in this paper is a cross-institutional collaboration between a two-year college (2YC) and a four-year college (4YC), designed to expose 2YC transfer students to a rigorous 12-week URE focused on geosciences. Findings from the program evaluation indicate the SUREC increased transfer student's STEM knowledge and skills, science identity, and self-efficacy. Twenty of the twenty-four SUREC participants, representing underrepresented and majority students alike, transferred to a 4YC to continue in geosciences or in a related STEM field within two-years of the URE. A strong cross-institutional collaboration that combined academic, financial, and mentoring support was key to enhancing transfer students' URE experiences. Leveraging teaching and research expertise of 2YC adjuncts as emerging academics and educators was a hallmark of this program.