An REU, or Research Experience for Undergraduates, is a paid summer research program funded by the National Science Foundation (NSF) that places college students in active research labs and field sites across the country. Students typically work alongside faculty mentors for 8 to 11 weeks, earning a stipend of roughly $700 per week while gaining hands-on experience in their field. REUs exist across nearly every scientific and engineering discipline the NSF funds, from ecology and physics to computer science and social sciences.
How an REU Program Works
Most REU programs run during the summer, though some operate during the academic year. A typical site hosts a cohort of about 10 students, though larger programs can bring in 20 to 30. You’ll be assigned to (or matched with) a faculty mentor and embedded in their research group, working on a real project rather than a classroom exercise. That might mean collecting field data, running experiments, writing code to analyze datasets, or building prototypes.
Beyond the lab work, programs usually include professional development components: seminars on graduate school applications, practice presenting research, and informal networking with other researchers. Many programs end with a poster session or symposium where you present your findings. The goal is to give you a compressed version of what life as a working scientist actually looks like.
Who Can Apply
Eligibility is straightforward but has firm boundaries. You must be an undergraduate student pursuing an associate’s or bachelor’s degree, and you must be a U.S. citizen, permanent resident, or U.S. national. You don’t need to be a junior or senior. Freshmen and sophomores apply and get accepted, especially if they show genuine interest in the research area.
Individual REU sites often add their own criteria on top of the NSF requirements. Some prioritize students from schools with limited research infrastructure, such as community colleges or small liberal arts colleges. Others look for specific coursework or lab skills. There’s no universal GPA cutoff set by NSF, but competitive programs naturally attract strong applicants.
NSF actively encourages REU sites to recruit students from underrepresented groups in STEM. Several programs have formal partnerships with minority-serving institutions, including Hispanic-serving institutions and historically Black colleges. Some sites send alumni from those partner schools to lead recruitment sessions, which has proven effective at increasing applications from students who might otherwise feel intimidated by the process.
What It Pays
REU programs are designed so that money isn’t a barrier to participating. The NSF sets an expected stipend of approximately $700 per student per week, which works out to roughly $7,000 to $7,700 for a standard 10- to 11-week summer program. On top of the stipend, most sites provide housing, cover meal costs, and reimburse travel to and from the program location. The total NSF investment can reach up to $1,550 per student per week when all costs are included.
The specifics vary by site. Some programs house students in university dorms and provide a meal plan. Others give you a housing allowance and let you arrange your own living situation. Either way, you should be able to participate without dipping into savings or taking on extra work.
How to Apply
Each REU site runs its own application process, so there’s no single centralized portal. The NSF maintains a searchable directory of active REU sites on its website, where you can filter by research area and location. Most applications open in the fall and have deadlines between January and March for the following summer.
A typical application asks for a personal statement explaining your research interests and why you’re drawn to that specific program, one or two letters of recommendation (usually from a professor or research supervisor), your transcript, and sometimes a resume. Reviewers look for research fit, a clear connection between your interests and the program’s focus, and evidence that you’d benefit from the experience. Prior research experience helps but isn’t always required.
Programs are competitive. You might not get accepted on your first try, and applying to multiple sites is common and expected. Casting a wide net across 5 to 15 programs that genuinely interest you gives you much better odds than pinning everything on one or two dream labs.
Why REUs Matter for Your Career
The most immediate benefit is clarity. After spending a summer doing real research, you’ll have a much better sense of whether graduate school, industry research, or a different path is right for you. In one large study, 68% of students reported increased interest in a STEM career after completing an undergraduate research experience, and 29% developed a new expectation of earning a PhD that they didn’t have before.
These effects aren’t fleeting. Follow-up surveys conducted nine months after program completion found that participants still held stronger confidence in their research abilities and a clearer sense of their career direction. The experience changes how you see yourself as a potential scientist, not just what’s on your resume.
That said, the resume boost is real. An REU gives you a meaningful research project to discuss in graduate school interviews, a faculty mentor who can write you a detailed recommendation letter, and often a conference presentation or publication to point to. Graduate admissions committees view REU participation as strong evidence that you understand what research involves and chose it deliberately.
Even if graduate school isn’t your goal, the skills transfer. Learning to design an experiment, analyze data, work independently on an ambiguous problem, and communicate technical findings clearly are valuable in virtually any STEM career. Students who go through REU programs consistently report gains in critical thinking, technical skills, and professional confidence that serve them well beyond academia.
REU Sites vs. REU Supplements
You’ll sometimes see the term “REU supplement” alongside “REU site,” and they’re worth distinguishing. An REU site is the structured cohort-based program described above, where a group of students comes to one institution for a shared experience. An REU supplement is a smaller add-on to an existing NSF research grant, where a single faculty member brings one or two undergraduates onto their project. Supplements offer the same stipend rate and can be equally valuable, but they don’t come with the built-in cohort, seminars, and social infrastructure of a site program.
Supplements are typically arranged directly between a student and a professor, so they’re less visible and harder to find through a directory search. If you’re already at a university where faculty hold NSF grants, asking a professor whether they have or could request supplement funding is a reasonable approach.