I primarily advise students pursuing a masters degree in Science, Technology, and Environmental Policy. As a professional program, most of our students pay for part or all of their tuition. A select number of students receive partial fellowships in the form of graduate research assistantships (typically 50% tuition waiver and 10 hours per week of salary support). There are also scholarships and fellowships to offset the costs of out-state tuition for non-residents and scholarships specifically for underrepresented and first-gen students (see, for example, DOVE Fellowships). I usually have 3-4 master's students who I accept each year as half-time graduate research assistants. Acceptance in the program does not necessarily require identification of a faculty research advisor at the time of application but it is great to initiate contact with prospective advisors before you apply.
For general questions about the program, including admissions, contact the STEP Coordinator, Olivia Schares <oschares@umn.edu>.
The application deadline for the M.S. program is December 15th. More info here: Master of Science in Science, Technology, and Environmental Policy Application Requirements | Hubert H. Humphrey School of Public Affairs (umn.edu)