NACLO 2021

  • January 7, 2022If no University site is near you, we encourage you to try to recruit a teacher, librarian, guidance counselor, or administrator at your own school to serve as NACLO hosts. More information can be found: here. Sites can still register with our help through January 22.
  • January 5, 2022With MIT and Stanford unable to host this year, NACLO has created the following sites by renting conference space near the two campuses. You can register to compete at the Boston Area Site (120 Broadway, Cambridge, MA 02142) or the San Francisco Bay Area (2670 El Camino Real, Santa Clara, CA 95051). Members of the NACLO organizing committee will serve as site hosts.
  • September 15, 2021Registration for the 2022 Open Contest will start in late September, 2021.
  • August 31, 2021Press Release about the performance of the NACLO teams at the 2021 IOL.
  • August 16, 2021NACLO 2022 will be on January 27 and March 17, 2022
  • July 19, 2021Press Release for the NACLO 2021 contest.
  • April 16, 2021Grading for the 2021 Invitational Round has concluded. The results can be accessed here. The Open Round and Invitational Round problems and solutions will be posted shortly. Thank you for participating!
  • February 27, 2021Grading for the 2021 Open Round has concluded and your score is available in your student account. The list of students who have qualified for the Invitational Round has been released. You can access it here.
  • February 26, 2021The scores from the Open Round will be posted tomorrow, Saturday, February 27.
  • February 1, 2021The NACLO 2021 Open Round took place on January 28, 2021. Results and invitations to the Invitational Round will be announced on or around February 28. If you missed this year's contest, registration for next year's contest will open in September 2022.
  • January 15, 2021The new registration deadline is Friday, January 22.
  • January 8, 2021 All participants enrolled to participate in the NACLO Open Round on January 28, 2021, from home (At-Home Site) should have received an email directly from NACLO with the subject line “NACLO 2021 At-Home Participants / Important Instructions.” Any At-Home participant who has not received this email should immediately contact All At-Home participants should check the email they used to register for the competition regularly for further instructions.

Please Donate

You can help support NACLO either by mailing a check or giving online. For more information on both, please see our donations page. We thank you for your support!


We're looking for new sites and problem contributors. Please contact us at