If your child loves biology and wants a challenge that goes far beyond the classroom, the USABO biology olympiad is the premier national competition that puts top high school students on the path toward the International Biology Olympiad.
USABO is the USA Biology Olympiad, a rigorous tournament administered by the Center for Excellence in Education (CEE). Each year it draws thousands of high school students who test their command of biology against a national field, with the ultimate goal of selecting a four-student team to represent the United States at the International Biology Olympiad (IBO). Below, we break down how the competition is structured, who can enter, and how students advance.
How the USABO Is Structured
USABO unfolds across three rounds of increasing difficulty. Each stage narrows the field, and recognition is awarded at every level.
Round 1: The Open Exam
The Open Exam is a short, proctored, online multiple-choice test taken nationwide. It is designed to be accessible to a broad pool of high school biology students while still rewarding genuine depth of knowledge. Top scorers earn certificates and advance to the next round.
Round 2: The Semifinal Exam
Students who place near the top of the Open Exam are invited to the Semifinal Exam, a longer and harder test that mixes multiple-choice with short-answer and true/false sections. This round demands not only recall but the ability to reason through unfamiliar biological problems. The strongest performers receive national recognition.
Round 3: The National Finals
A small group of the very top semifinalists is invited to the National Finals, a residential program hosted at a university campus. Over roughly two weeks, finalists take part in intensive instruction and hands-on laboratory training led by professors and former olympians, followed by theoretical and practical examinations.
At the conclusion of the National Finals, four students are selected to form the USA team for the International Biology Olympiad, where they compete against national teams from around the world.
Who Can Enter, and What It Tests
The Open Exam is generally open to high school biology students in grades 9 through 12 who register through a participating school or an authorized test center. Advancing beyond the Open Exam to the Semifinal and onward typically requires U.S. citizenship or legal permanent residency, since later rounds feed into the U.S. international team.
Content-wise, USABO spans the full breadth of biology: cell and molecular biology, genetics, anatomy and physiology, ethology, ecology, evolution, and biosystematics. The exams reward conceptual understanding and experimental reasoning, not memorization alone. Students who do well usually study well beyond a standard AP Biology course, often working through college-level texts and past problem sets.
How to Prepare and Where It Leads
Serious preparation tends to combine three habits: reading a comprehensive university-level biology textbook, drilling past USABO and IBO problems to learn the question style, and building lab intuition so the practical portion of the Finals feels familiar. Consistency over many months matters far more than last-minute cramming.
USABO also fits naturally into a wider portfolio of academic challenges. Students who enjoy structured, high-difficulty competition often pursue parallel tracks in other olympiads and contests, and the analytical discipline carries over into independent research projects that can deepen a college application. A strong USABO showing signals genuine scientific talent to admissions committees and mentors alike.
At BIAA, we coach ambitious K-12 students to approach competitions like USABO with a clear plan, strong fundamentals, and real laboratory and research exposure. If your student is ready to turn a love of biology into measurable achievement, explore our research and STEM programs or start at our homepage to find the right path forward.