Which day BJJ open mats happen
Saturday is the busiest open-mat day, with 575 sessions a week.
Sat has 575 open-mat sessions and Fri has 503. Boston lists an open mat on 87% of published weeks. Atlanta lists one on 43%.
Open mats by city
Cite this data
OpenMapp, “Which day BJJ open mats happen,” State of BJJ in America, October 2026, https://www.openmapp.com/data/bjj-open-mat-days
Journalists, bloggers, and gyms are welcome to quote these figures with a link back to this page. Numbers update as listings are verified.
How we count
Every figure comes from the 1,364 US Brazilian Jiu-Jitsu gyms on OpenMapp with a published weekly timetable and a saved location. Class times come from each gym’s own schedule. Visitor policies and drop-in prices count only where the gym states them; anything unstated stays out of the totals rather than being guessed. Per-capita figures divide by the population of the whole metropolitan area, not the city limits.