Field size will be 30,000 official entrants for the 119th running of event.
BOSTON -- Registration for the 2015 Boston Marathon opens on Monday, September 8, 2014 at 10:00 a.m. ET. The B.A.A. will use the same process to register qualified runners as it used in the 2012, 2013, and 2014 Boston Marathons, allowing the fastest qualifiers to register first.
Registration will be held entirely online at www.baa.org. The qualification window for the 2015 Boston Marathon began last year on September 14, 2013.