The Boston Athletic Association announced Wednesday that the 2021 Boston Marathon will not be held on its traditional date of the third Monday in April and will be postponed “until at least the fall of 2021.”

“With fewer than six months until Patriots’ Day and with road races prohibited until Phase 4 of the Massachusetts reopening plan, we are unable to host the Boston Marathon this coming April,” BAA CEO Tom Grilk said in a statement. “By shifting our focus to a fall date we can continue to work with stakeholders to adjust the in-person experience for runners and supporters alike. Prioritizing the safety of participants, volunteers, spectators and community members, we continue to assess all elements of the race including a potential reduced field size or weekend date.”

The organization indicated it will continue to have meetings with its advisory group as well as local, city and state officials, sponsors, organizing committee members and other stakeholders to determine if a fall 2021 date is feasible. The BAA hopes to announce a date before the end of the year.

“We are optimistic that the Boston Marathon will continue its tradition of celebrating the spirit of community and athletic excellence next fall. We know there will be many questions and we will look to address them in the coming months ahead,” Grilk said.

The race, which annually brings about 30,000 people — runners, volunteers, organizers, security, fans and others — to Hopkinton for the start, was postponed from April to September this year and then transitioned to a 10-day virtual experience, in which runners ran on their own and submitted their times.