Is Princeton or WashU better for biology majors?

The biggest practical tradeoff is research style and academic structure: Princeton gives biology majors a more intimate undergraduate-focused experience with a required junior paper and senior thesis, while WashU offers unusually strong access to medical, clinical, and life-sciences research because of its close connection to a major medical school. For biology specifically, both are excellent, but they feel different in day-to-day undergraduate life. Princeton tends to emphasize independent scholarship and close faculty engagement, while WashU is especially appealing for students who want broad lab options and a strong premed-adjacent environment.

At Princeton, the Department of Ecology and Evolutionary Biology and the Department of Molecular Biology together create a very strong biology ecosystem, and undergraduates are expected to do substantial original work. That can be a real advantage if you want deep mentorship, small classes in the major, and a curriculum that pushes you toward writing, analysis, and research independence. Princeton is especially attractive for students who like theory as much as application.

WashU stands out for the scale of biological and biomedical opportunity available to undergrads. Because the university has a major medical school and extensive research infrastructure, biology students often find it easier to plug into labs across basic science, neuroscience, genetics, public health, and translational research. The undergraduate biology program is also well known for flexibility and for serving students headed toward research, medicine, and biotech.

One important difference is campus culture around biology. At WashU, biology can feel more professionally oriented because so many students are interested in medicine or health-related fields. At Princeton, the atmosphere is often a bit more broadly academic and less centered on premed identity, even though many students still pursue medical school.

If your question is which is stronger overall for undergraduate biology alone, I’d give a slight edge to Princeton for students who want a more rigorous, thesis-driven liberal arts research experience, and a slight edge to WashU for students who want maximum exposure to biomedical labs and a more direct pipeline into medical and life-science applications. Between the two, neither would be a weak choice, but the better biology program for you depends on whether you want independent scholarly depth or a larger biomedical research engine.