American Rocketry Challenge registration for the 2026 competition opened on July 15, 2025 at 9:00 AM ET , and the public rules page says registration is open from May to December each year.

For 2027 , I couldn’t verify an exact opening date from the available results, but the program has already posted ARC 2027 parameters and notes that full rules will follow.

What’s known

  • 2026 registration opened July 15, 2025 at 9:00 AM ET.
  • A general FAQ says registration is open from May to December every year.
  • ARC 2027 parameters were announced on January 15, 2026, with full rules to come later.

Practical read

That usually means 2027 registration will likely open sometime in the same spring-to-summer window, but I can’t confirm the exact date from the information available here.

TL;DR: No exact 2027 opening date is confirmed yet; the best verified clue is that registration typically opens between May and December, and the prior cycle opened on July 15, 2025.