Welcome to the 2027 USABO competition! The 2027 changes reflect the continued development and recognition of USABO where students who are passionate about biology find like-minded colleagues in the USA and abroad.
To participate, schools must first pay the $125 flat registration fee (which covers all participating students from each registered school) by October 23, 2026 . School registration and fee payment are required prerequisites before any student can be registered. The final deadline for both schools and students to complete online registration is November 15, 2026 . Register at https://www.usabo-trc.org .
The 2027 National Finals will be in person ONLY .
This page is the landing site for the USABO https://www.usabo-trc.org . Click on the Facebook icon at the bottom of the page and friend the USABO.
CEE continues to provide a more user-friendly registration site tested for usability by USABO teachers. Once your school information has been entered, it will be permanently stored to ease registration in coming years. Teacher information is not stored as many teachers move on to new positions, retire, or for other reasons no longer participate in the USABO. If you registered your school for the USABO in the years 2011 through 2026, you will find your school in the dropdown menu in the Test Administrator section on the USABO homepage. This allows the teacher to register for the current year without entering all the school information, it does not mean that your school is registered. Although you will find your school in the dropdown menu, all teachers and students must register for 2027 and the $125 registration needs to be paid.
The USABO Open Exam uses Multiple Choice format with one response per question.
The USABO Semifinal Exam uses the Multiple Choice, Multiple True/False Choice, and Short Answer formats.
IBO Theoretical and USABO National Exam use t he Multiple True/False Choice format.
The TRC is dynamic. Once your school has completed the registration process and payment has been received, please check the TRC for the latest resources and links to help you to prepare your students for the USABO. Content is arranged according to the seven IBO focus groups:
All Open Exams and the Semifinal Exams from 2003 to 2024 with keys are available online in the Teacher Resource Center (TRC). Test Administrators may use them as they see fit with their students. Under no circumstances is the URL to be provided to students or linked to school or external web sites!
This area is open to ALL students whether they have registered for the USABO or not. It includes the following sections:
This page has information specifically for students who have registered for the USABO.