Boston Marathon weekend stepped into its busiest single day on Saturday as nearly 10,000 runners took over Back Bay for the Boston 5K presented by Point32Health, the B.A.A. Invitational Miles and, for the first time in race history, the B.A.A. Youth Mile. Saturday's block of racing, part of the expanded Distance Medley programme, funnelled professionals, charity runners and school-age athletes across the same Boylston Street finish line that will host the 130th Boston Marathon on Monday afternoon.
The Boston 5K set off from Boston Common shortly after 8am and threaded its way through a 3.1-mile loop of Back Bay before returning to Boylston. American record holders Molly Huddle and Ben True headlined a field that had been billed as one of the most competitive in the event's history, alongside Kenyan teenager Dorcus Ewoi returning to defend her mile title from the previous year. The B.A.A. used the morning to showcase the Invitational Mile's full professional programme, with the Atlanta Track Club squad of Clay Pender, Luke Houser, Luciano Fiore and Sean Dolan — the quartet that set a 4x800 metres indoor world record earlier this season — all listed on the men's start line.
The afternoon belonged to the schoolchildren. Nearly 1,000 runners aged 7 to 14 were entered for the inaugural B.A.A. Youth Mile, which routed up Dartmouth, along Berkeley, down Hereford and onto Boylston for a flat, closed-road mile finishing at the marathon line. The free event, introduced this year after several years of planning with local school systems, replaces the age-restricted children's programme that had previously been folded into the Invitational Mile, and is designed to give children the experience of running Boylston Street without requiring competitive entry. Organisers have described the format as the single largest expansion of youth participation in the history of Boston Marathon weekend.
Running parallel to the Youth Mile are the Scholastic Miles and Middle School 1K, which showcase student athletes from each of the eight cities and towns on the Boston Marathon course. Hopkinton, Ashland, Framingham, Natick, Wellesley, Newton, Brookline and Boston each send teams to compete over the same course, and the event has become one of the informal markers of the Patriots' Day weekend for local families. By early afternoon the finish-line grandstand was crowded with parents watching children who, in many cases, had never previously raced on a closed city street. The mood around Copley Square was markedly calmer than the Friday expo crowds, with cool temperatures and intermittent sunshine holding all day.
With the Boston Marathon itself now under 48 hours away, Saturday's programme served as the weekend's transition point from build-up to execution. Shakeout runs from adidas, Tracksmith and Heartbreak Hill Running Company will continue into Sunday morning, the elite press conference takes place at the Fairmont Copley Plaza on Sunday afternoon, and the first corrals of the six-wave men's and women's fields will begin loading buses to Hopkinton before dawn on Monday. For the athletes in Saturday's 5K and miles, however, a race on Boylston Street two days before the marathon is a fixture in its own right — and in 2026, one with its youngest ever participants on the start list.