Heartbreak Hill is the most famous hill in American distance running, and also one of the most misunderstood. It isn't the steepest climb on the Boston Marathon course, and it isn't even the first hill in Newton — it's the fourth and final one, arriving at the exact point in the race where fatigue makes any incline feel worse than its grade suggests. This guide covers where it is, where its name comes from, and why it matters so much more than its numbers alone would predict.

Where Heartbreak Hill actually is

Heartbreak Hill sits on Commonwealth Avenue in Newton, roughly between mile 20 and mile 21 of the course, cresting near the Boston College campus at Chestnut Hill. It's a climb of roughly half a mile, and while sources vary slightly on the exact vertical rise, independent estimates consistently put it in the range of roughly 90 feet — a real but not extreme hill by the standards of hillier marathon courses. What makes it notorious isn't the grade on its own; it's everything that comes before it.

The fourth of four, not the only one

Heartbreak Hill is the last of four hills that make up the Newton hills, a stretch that begins several miles earlier near the Route 128 overpass and continues, on and off, through mile 21. Runners who don't know the course sometimes brace for one big hill and are caught off guard by the three climbs that come before it — by the time Heartbreak Hill itself arrives, legs have already been climbing, on and off, for the better part of four miles, on top of the net-downhill fatigue banked in the race's first half.

Where the name comes from

The name traces back to the 1936 Boston Marathon, when defending champion Johnny Kelley caught up to race leader Ellison Tarzan Brown on the hill and gave him an encouraging pat on the back as he passed. The gesture backfired: it motivated Brown to surge back ahead and win, and a Boston Globe reporter described Brown as having broken Kelley's heart on that stretch of road. The name stuck to the hill itself. Kelley went on to have one of the longest careers in the race's history, and a statue at the intersection of Commonwealth Avenue and Walnut Street, near Newton City Hall and about a mile before Heartbreak Hill's own base, commemorates him as both a young champion and an elderly finisher, hand in hand with himself across six decades of running Boston.

Why it decides so many races

Heartbreak Hill's reputation isn't marketing — it genuinely arrives at the worst possible moment. Glycogen stores are running low for most runners by mile 20 regardless of the terrain, and the accumulated muscle damage from the course's early downhill miles tends to surface right around here, which is why even runners who feel strong through halfway sometimes find themselves struggling on a hill that wouldn't trouble them at mile 3. It's also, not coincidentally, one of the loudest and most-visited spectator spots on the entire course — the Boston College crowd along this stretch is a fixture of the race, and a running store based right at the base of the hill has become a local institution on race day.

How to run it

• Respect the three hills before it. Heartbreak Hill doesn't exist in isolation — protect your legs through the earlier Newton climbs so you have something left.
• Shorten your stride rather than fighting the grade. Boston's hills reward efficient, controlled climbing over brute effort.
• Don't judge your race by how the hill feels. It's supposed to feel hard at mile 20 — that's the point in the course where it arrives, not a verdict on your fitness.
• Use the descent that follows. The course drops back down toward Boston College and Brookline right after the crest — it's real recovery if your legs have anything left to give it.

After the crest

Once you're over Heartbreak Hill, the hardest terrain of the Boston Marathon is behind you — the final five-plus miles run downhill and flat toward Kenmore Square and Boylston Street. That doesn't mean the race is easy from there; it means the challenge shifts from terrain to pure fatigue management. Runners who arrive at the crest with something in reserve tend to have a much better final 10K than the ones who spent it all in Newton.