A summer undergraduate research experience (often shorthanded to “SURE,” or, when it is specifically an NSF-funded slot, an “REU”) is a full-time, mentored research placement that runs roughly eight to ten weeks over the summer, usually at an institution other than the student’s own. It is not a job shadow and not a lab tour: a participant is given a real, defined project, works under a named faculty or scientist mentor, is normally paid a stipend, and is expected to produce a tangible research output — most often a poster or short presentation at a closing symposium — by the end of the summer. For research administrators and faculty mentors, these placements sit at the intersection of federal grant compliance, human-subjects and lab-safety training, and early-career researcher development; for students, they are usually the first time “doing research” stops being a class assignment and starts looking like the job.
This guide covers both sides: what a prospective applicant needs to know to find and apply to one of these programmes, and the administrative obligations — funding structure, training prerequisites, authorship, mentoring plans — that a host institution takes on by running one. For a detailed breakdown of how the underlying funding models differ (federal grant vs. institutional budget vs. departmental award), see CASRAI’s companion guide on undergraduate research award programs; this page focuses on the experience itself.
The Major Programme Families
“Summer undergraduate research” is not one programme — it is a category covering several distinct funding mechanisms and host organizations. The largest and most widely known are federal, but institutional and society-run programmes fill in the rest of the landscape.
NSF REU: Sites and Supplements
The National Science Foundation’s Research Experiences for Undergraduates (REU) program is the largest single source of these placements in the US. It runs through two mechanisms: REU Sites, where a faculty PI is awarded a grant specifically to host a cohort of students (typically around 8–10 per year) for a defined summer programme, and REU Supplements, which add one or more undergraduates onto an already-funded NSF research grant. NSF publishes guidance suggesting a typical student stipend on the order of $700 per week, though individual Sites set their own amounts and support (housing, meals, travel) on top of that. Critically, students do not apply to NSF itself — each Site runs its own recruitment and selection, most discoverable through NSF’s public directory of active REU Sites. See CASRAI’s REU vs. research internship comparison for how an REU placement differs from a general-purpose lab internship.
NIH-Funded Undergraduate Research
The National Institutes of Health supports undergraduate summer research through two distinct routes: the NIH Summer Internship Program, which places students directly in labs on NIH’s own campuses (primarily Bethesda, Maryland, and other NIH facilities), and R25-mechanism education/training grants that fund summer research cohorts at universities and medical centers around the country, similar in structure to an REU Site but administered under NIH rather than NSF rules. Individual institutes (NCI, NIGMS, NHLBI, and others) also run their own named summer programmes with their own eligibility and application specifics.
DOE SULI
The Department of Energy’s Science Undergraduate Laboratory Internships (SULI) programme places students in a 10-week summer research internship (a semester-long option also exists) at one of DOE’s 17 national laboratories. SULI is open to full-time undergraduates at two- and four-year institutions, as well as recent graduates within two years of a bachelor’s or associate degree. Applications for a given summer term typically open the preceding autumn, with a hard deadline in early January — considerably earlier than many university-run programmes, which is a common scheduling trap for first-time applicants.
NASA and NIST
NASA’s Office of STEM Engagement runs paid undergraduate internships across its field centers, working on projects tied to active missions and research directorates. The National Institute of Standards and Technology runs its own Summer Undergraduate Research Fellowship (SURF), placing students in NIST’s physical-sciences and engineering laboratories. Both follow the same general shape as REU and SULI — a defined project, a named mentor, a cohort of peers — but each agency sets its own application portal, timeline, and eligibility detail, so a student targeting a specific agency should always confirm the current cycle’s requirements directly on that agency’s own site rather than assuming NSF’s rules apply.
Institutional and Society-Run Programmes
Outside the federal-agency programmes, two other categories fill out the landscape:
- Institutional programmes — a university funds its own summer research cohort from operating or endowment funds, independent of any single federal grant (MIT’s UROP and Caltech’s SURF are the two most commonly cited models other institutions borrow the name or structure from).
- Society- and foundation-run programmes — national, multi-institution programmes run by a scientific society or foundation rather than a single university. The Amgen Scholars Program, established in 2006 and hosted across roughly two dozen research universities in the US, Europe, and Asia, and the Leadership Alliance, which places students for eight to ten weeks with a faculty mentor at a participating member institution with an explicit focus on preparing students for PhD and MD/PhD study, are two well-established examples aimed specifically at students from backgrounds underrepresented in the sciences.
See CASRAI’s guide to research funding at minority-serving institutions for the broader funding landscape many of these access-focused programmes sit within.
Eligibility: Who Can Apply
Eligibility varies by programme, but a few patterns hold across most of them:
- Enrollment status. Nearly all programmes require current enrollment as an undergraduate (some, like DOE SULI, also accept very recent graduates), typically with a minimum number of semesters of coursework completed — specific GPA and class-standing thresholds are set by each individual programme, not by NSF or DOE centrally.
- Citizenship, for federally funded slots. This is the single most important eligibility fact for a student to know early: participation in an NSF REU-funded position, and in most other federally funded programmes (SULI, NASA, NIH-direct placements), is restricted to U.S. citizens, U.S. nationals, or U.S. permanent residents. NSF states this plainly and without exception. Institutionally funded programmes are more likely, though not universally, to be open to international students — always confirm directly with the specific programme rather than assuming.
- Discipline fit. Programmes are typically organized around a specific field or department (physics, chemistry, computer science, social science, etc.), so the first filter for a student is usually “which REU Sites or programmes exist in my field,” not “which programmes exist generally.”
How the Application Cycle Works
Most summer programmes run on the same rough calendar: applications open in the autumn or early winter of the preceding academic year, with deadlines clustering from December through February for a summer start, and DOE SULI’s early-January deadline sitting at the front of that range. A typical application package includes:
- A personal statement explaining research interests, relevant coursework or prior experience, and why that specific programme or lab is a fit — see CASRAI’s guide to writing a personal statement for research applications for structure and worked examples.
- Letters of recommendation, usually two, from faculty who can speak to the student’s coursework performance and readiness for independent research. Because faculty need real lead time to write a substantive letter, students should ask at least four to six weeks before the earliest deadline they are targeting, not the week before.
- An unofficial transcript, to confirm enrollment status, class standing, and relevant coursework.
- Some programmes additionally require a short research-interest ranking (which faculty mentors or project areas the applicant would prefer) or a brief supplementary essay.
Because each REU Site, SULI lab, or institutional programme runs its own independent selection, there is no single centralized application the way there is for, say, undergraduate admissions — a student applying broadly is genuinely filling out several separate applications, each with its own deadline and required materials.
What Participants Actually Do
A well-run placement gives a student four things: a defined, real research project (not busywork); a named mentor who is actually available for regular guidance, not just nominal supervision; structured cohort activities (seminars, journal clubs, skills workshops, social events) that build a peer community across the summer; and a closing deliverable, almost always a poster presented at an end-of-summer research symposium, sometimes alongside a short oral talk. Compensation typically includes a stipend and, for placements away from a student’s home institution, housing and travel support — the specific amounts are set independently by each programme and vary considerably, so a prospective applicant should confirm the actual figures for any programme they are considering rather than assuming a standard rate. CASRAI’s guide to scientific poster design covers how to prepare that closing symposium poster well.
The Administrative Layer Behind Every Placement
This is the part a student rarely sees but a host institution cannot skip, and it is where CASRAI’s standards-body perspective adds the most beyond a purely student-facing description of the experience.
- Funding flows to the institution, not the student. An REU Site award, an R25 education grant, or a SULI-hosting laboratory’s funding is a grant to the institution or national lab, administered by a PI and a research administration office — the student is a programme participant, not a grantee. That distinction shapes everything from tax treatment of the stipend to who is responsible for reporting outcomes back to the funding agency.
- Training has to happen before research does. Before an undergraduate can touch a live project, most host institutions require completion of role-appropriate safety and compliance training — general lab safety orientation, and, for any project involving human blood, tissue, or other potentially infectious material, formal bloodborne pathogens training. See CASRAI’s broader lab safety rules guide for what a complete onboarding checklist typically covers. Programmes involving human-subjects research add IRB-related training on top of general lab safety.
- Authorship has to be decided deliberately, not by default. A summer placement frequently produces work that ends up as part of a published paper months or years later. Whether that student’s contribution rises to the level of authorship — rather than an acknowledgment — should be assessed against the same criteria as any other contributor’s, not treated as automatic or automatically excluded because the contributor was a summer student. CASRAI’s guide to ICMJE authorship criteria and the CRediT taxonomy both give a mentor and administrator a structured way to make that call and document exactly which roles (data curation, investigation, writing) the student actually performed.
- IP and data ownership are the host institution’s, by default. Work produced during a placement is typically governed by the host institution’s intellectual property and research-data policies, not the student’s home institution’s — a distinction that matters if a project later leads to a patent disclosure or a dataset the student wants to reuse in their own subsequent work.
- Mentoring plans are increasingly a funder requirement, not a courtesy. NSF and other funders have moved toward requiring REU Site proposals to include an explicit mentoring plan describing how students will be supervised, mentored, and professionally developed over the summer — this is now a real element of proposal review, not just good practice left to individual PIs’ discretion.
How It Fits a Research Career
A completed summer research experience is one of the more concrete pieces of evidence a graduate admissions committee can evaluate: it demonstrates sustained, independent-ish work on a real problem, under real mentorship, over a meaningful stretch of time — considerably more evidence of research readiness than a single course project. Students who complete a placement can usually point to it in three concrete ways on a later application or CV: the symposium poster itself (which can often be adapted into a poster presented again at a disciplinary conference), a line in a personal statement describing the specific project and what was learned from it, and, less commonly but not rarely, a co-authorship credit or acknowledgment on a resulting paper or preprint if the work matures that far. A strong faculty letter of recommendation from the summer mentor is frequently the most durable outcome of the summer, carrying weight well beyond the programme itself.
Finding a Programme
There is no single application portal covering every summer undergraduate research programme, but a few starting points cover most of the landscape:
- NSF’s public directory of active REU Sites, searchable by discipline and institution, is the standard starting point for NSF-funded placements.
- Pathways to Science maintains a broader, cross-agency database of summer research and fellowship opportunities, including many of the federal-agency and society-run programmes described above.
- Individual agency and lab sites — DOE’s Office of Science Workforce Development pages for SULI, NASA’s internship portal, and NIST’s SURF page — are the authoritative source for that specific agency’s current cycle, deadlines, and eligibility.
- Institutional listings — a student’s own university career center, undergraduate research office, or department often maintains a curated list of programmes past students have attended successfully, which is frequently a faster way to find a well-regarded fit than searching from scratch.
Frequently Asked Questions
Is a summer undergraduate research experience the same thing as an REU?
Not exactly. “REU” specifically refers to NSF’s Research Experiences for Undergraduates program. “Summer undergraduate research experience” is the broader category that REU sits inside, alongside DOE SULI, NIH-funded programmes, NASA and NIST internships, and institutional or society-run programmes that are not NSF-funded at all.
Are these programmes paid?
The federally funded programmes (REU, SULI, NASA, NIH-direct, NIST SURF) are paid, typically with a weekly stipend and often housing or travel support. Institutional and society-run programmes are generally paid too, though the amount and structure are set independently by each one — always confirm before assuming a standard rate.
Can international students apply?
Not to federally funded positions in most cases. NSF requires REU-funded student participants to be U.S. citizens, U.S. nationals, or U.S. permanent residents, with no exceptions, and most other federal programmes apply similar restrictions. Institutionally funded summer research programmes are more likely to be open to international students, but this varies by institution and should be confirmed directly with each programme.
Do I need prior research experience to apply?
Generally no — these programmes exist specifically to give students their first sustained research experience, and most explicitly welcome applicants without prior lab experience. Relevant coursework and a genuine, well-articulated interest in the field typically matter more than a prior research record.
How far in advance should I ask for letters of recommendation?
At least four to six weeks before the earliest deadline of any programme on your list. Because deadlines cluster from December through February and some (like DOE SULI) fall in early January, this often means asking in the autumn semester, well before winter break.
Does a summer placement come with authorship on a paper?
Not automatically, and it shouldn’t be assumed either way. Whether a student’s contribution merits authorship depends on what they actually did — assessed against a framework like ICMJE’s authorship criteria or the CRediT taxonomy — not on the fact that they were a summer participant rather than a longer-term lab member.
