If the overview guide to Boston's course covers the shape of the race, this one covers the shape of each mile. The Boston Marathon rewards runners who know the route's terrain and landmarks well enough to break the race into manageable pieces — Wellesley, the Newton hills, the Citgo sign — rather than facing 26.2 miles as one undifferentiated block. Here's what to expect, roughly mile by mile, from Hopkinton's town common to Boylston Street.

Miles 1-6: Hopkinton to Framingham

The race starts on Main Street in Hopkinton, and the very first stretch is the steepest sustained downhill of the entire course — a fast, testing start for legs that are about to spend 26 more miles working. The road eases through Ashland by around mile 3 and continues rolling gently downhill into Framingham, past the old railroad depot that marks one of the course's early spectator hubs. Nothing here is technically difficult; the challenge is entirely restraint.

Miles 6-10: Framingham to Natick

The route continues through Framingham and into Natick, where the Natick Town Common draws one of the biggest early-race crowds outside of Wellesley. The terrain stays gently rolling rather than flat through this stretch, and it's a common spot for runners to take their first honest read on how the early pace actually felt, once the crowd noise settles and the legs start reporting back.

Miles 10-13: The approach to Wellesley

Past Natick, the course continues toward Wellesley, and the noise builds well before the town line. The Wellesley College Scream Tunnel arrives around mile 12 and runs for a memorable stretch of Route 135, with the half-marathon split arriving just past mile 13 — meaning most runners hit their halfway point still riding the noise from campus. It's one of the loudest sustained stretches in American marathoning, and a useful gut-check moment for pacing discipline.

Miles 13-16: Wellesley to Newton Lower Falls

After Wellesley, the course turns and heads toward Newton, with rolling terrain that's easy to underestimate. This stretch is quieter than the miles on either side of it, and it's the last real chance to settle into a sustainable rhythm before the race's defining test begins.

Miles 16-21: The Newton hills

The first of four Newton hills arrives near the Route 128 overpass, shortly after mile 16, and the climbs continue on and off for the next several miles. Around mile 19, the course passes a memorial statue of Johnny Kelley near the intersection of Commonwealth Avenue and Walnut Street — a tribute to the runner most associated with this stretch of the course and, by extension, with Heartbreak Hill itself, which crests a mile or so further on. RaceRove's dedicated Heartbreak Hill guide covers that climb in full; the short version here is that it's the last and best-known of the four, not the first, and by the time runners reach it they've already been climbing, on and off, for miles.

Miles 21-26: Brookline to the finish

Cresting the hills near Boston College, the course descends through Chestnut Hill and Cleveland Circle before turning onto Beacon Street and running through Brookline's Coolidge Corner. Around mile 25, the Citgo sign comes into view above Kenmore Square — a long-standing landmark for runners closing in on the finish — before the course threads past Fenway Park and into the final stretch. The last turns, right onto Hereford Street and left onto Boylston Street, arrive with well under a mile to go, and the finish line sits near Copley Square, in front of the Boston Public Library.

Using the mile markers to pace your race

Breaking the course into these named sections is more useful on Boston than on most marathons, because the terrain genuinely changes character block by block rather than settling into one steady rhythm. Treat Hopkinton through Natick as controlled effort, Wellesley as a noisy but disciplined half-marathon split, the Newton hills as the section to protect above all else, and Brookline through Boylston as wherever your legs happen to be by then. The race's own data card on this page has the certified course specifics; this guide is meant to help you picture what's between the start and finish lines.