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USABO 2021 Calendar


   September 2020

September 14

       Registration Opens

                               December 2020

December 4

December 11

        School Registration Closes

        USABO Student Registration Closes



January 2021

January 8 


January 15

January 19

        Art of Problem Solving (AoPS) Registration Opens 

        Extended February 5 at 6 PM ET

        Registration Fee ($95/school) 

        Open Exam Practice Exam with Art of Problem Solving (AoPS)



February 2021

February 5

February 11



    Art of Problem Solving (AoPS) Registration Extended 6 PM ET

    Online Open Exam Administered by Art of Problem Solving

     4 PM (ET) Only


                                March 2021

March 3





April 16

April 30

        Open Exam Scores Available in the TRC and          SRC with Semifinalists (Top 10%) designated 


 April 2021


         Online Semifinal Examination Administered at 4 PM (ET) Only

         Semi-Final Examination Scores Available in TRC & SRC



                               May 2021

May 5


May 14


        Finalists (Top 20 and ties) designated in TRC and SRC

        National Finalists Announced on the USABO website           

        National Finalists Finals Registration Completed

May 22 - June 5

        Virtual National Finals 

                               June to July 2021

May 22 - June 5

        Virtual National Finals 

June 2

        Announcement of Awards and USA Biolympiad Team members

June 4 to 5

        Instruction and Mentoring of USA Biolympiad Team 

July 18 to  25

        International Biology Olympiad in Lisbon, Portugal (Virtual)