The Boston Marathon course
140 m net downhill (145 m → 5 m).
Boston is a net-downhill, point-to-point course that flatters the first half and punishes the second. From Hopkinton the road plunges roughly 100 metres in the opening 10 km — gloriously fast, and the single biggest mistake on the course: hammer it and your quads are gone before the hills. Through Framingham and Natick the gentle descent is genuinely free speed, and Wellesley’s scream tunnel marks halfway with a sharp drop into Newton Lower Falls. Then the course turns. The four Newton Hills climb from 25 km to Heartbreak Hill at about 33 km — a ~3.4% pitch that tops out near mile 20.5, precisely where the marathon wall lives. The reward is a long, quad-shredding descent past Boston College that can hurt as much as the climbs if you let it run away. An even-effort plan slows your target pace on every rise and only lets it loose where the course gives it back. Cross-check your number against our grade-adjusted pace calculator, and if you are chasing a qualifier, the Boston qualifier calculator shows the time your age group needs.
Course segments
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Hopkinton plunge (Start–10K) -0.7% · −68 m
The steepest drops on the course — the first kilometre falls about 5%. Banking seconds here trashes your quads for the hills to come; run this slower than goal pace.
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Framingham & Natick (10–21K) -0.3% · −30 m
A long, gentle net descent through Framingham and Natick — the “free speed” stretch. Settle into your goal effort and let the course do some of the work.
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Wellesley & the half (21–25K) -0.4% · −17 m
The Wellesley scream tunnel hits at halfway — do not surge with the noise — then the road drops sharply into Newton Lower Falls just before the climbs.
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Newton Hills (25–32.5K) +0.4% · +30 m
Four rolling climbs starting at the Route 128 overpass. Hold effort steady and let your pace slow on each rise — chasing your goal split here is how Boston ends.
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Heartbreak Hill (~32.5–33.3K) +3.4% · +27 m
The last and most famous Newton hill, about +3.4% to a crest near mile 20.5. It is not the tallest climb, just the one that comes when you are emptiest.
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Boston College descent (33.3–40K) -1.1% · −74 m
A long downhill past Boston College on shredded quads. Re-accelerate gently — slamming this descent is the second classic Boston blow-up.
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Boylston finish (40–42.2K) -0.4% · −8 m
One last bump over the Mass Pike near mile 25, then right on Hereford, left on Boylston for a flat ~575 m to the line.
Race-day weather
The Boston Marathon is run in April. A typical race morning is around 53 °F with a dew point near 40 °F (a temperature-plus-dew-point sum of 93), so no heat penalty in a typical year. If the forecast is warmer than usual, slow your goal with the heat-adjusted pace calculator before race day — heat is the most common reason a goal pace falls apart.
Boston qualifying
Boston is the race the whole Boston-qualifier system is built around. To see the time your age group and gender need, use the Boston qualifier calculator . Meeting the standard does not guarantee entry in oversubscribed years, when a cut-off buffer applies.
How this plan is built
Splits come from an even-effort, grade-adjusted model: your goal time is spread across the course by each segment's energy cost, so you hold the same effort up the hills and down them instead of chasing one flat clock pace. See the generic marathon pace calculator for a course-blind even pace, or browse marathon pace calculators by course for other majors.
Sources
- Boston Marathon course & elevation profile Boston Athletic Association course map / Marathon Handbook course guide (Hopkinton → Boylston St, ~−140 m net, Newton Hills, Heartbreak Hill ~mile 20.5).
- Course analysis & historical race-day weather Find My Marathon — Boston Marathon course analysis and historical Patriots’ Day weather (start-time temperature distribution).
- Hopkinton April climate (temperature & humidity) Weather Spark — average April weather for Hopkinton, Massachusetts (used to estimate race-morning temperature and dew point).
- Even-effort pacing (grade-adjusted cost) Minetti, Moia, Roi, Susta & Ferretti (2002), “Energy cost of walking and running at extreme uphill and downhill slopes”, J. Appl. Physiol. 93(3): 1039–1046.
- Race-day heat & humidity adjustment Mark Hadley / Maximum Performance Running — temperature + dew-point pace-slowdown method (air temp °F + dew point °F → % slowdown band).
FAQ
Is the Boston Marathon course downhill or hard?
Both. Boston drops about 140 m from Hopkinton to Boylston Street, so it looks fast on paper, but the Newton Hills and Heartbreak Hill arrive at miles 16–21 when your legs are already tired, and the steep early and late descents pound your quads. It is a deceptively demanding course, not a fast one — which is why even-effort pacing matters here more than almost anywhere.
How should I pace the Newton Hills and Heartbreak Hill?
By effort, not by pace. Hold the same effort you held on the flat and accept that your per-mile pace will slow by 15–30 seconds on each climb — that is what the split table above does for you. Heartbreak Hill is only about a 27 m climb at ~3.4%, but it crests near mile 20.5, so the runners who survive it are the ones who banked effort, not seconds, on the downhill start.
Why is the first half of Boston so dangerous?
The Hopkinton downhill drops roughly 100 m in the first 10 km. It feels effortless, so most runners bank time well under goal pace — and arrive at the Newton Hills with quads that are already micro-damaged from the eccentric pounding of the descent. The even-effort plan deliberately holds your early splits slower than your average goal pace.
What is the weather usually like for the Boston Marathon?
Patriots’ Day (mid-to-late April) typically starts around 53 °F with a dew point near 40 °F — comfortable for racing in most years. But Boston has fat weather tails: 2012 and 2004 were brutally hot, 2018 was a cold Nor’easter, and the prevailing west-southwest wind can be a tailwind or, in a storm, a punishing headwind. In a warm year, slow your goal pace using the heat estimate on this page.
Does this calculator help me qualify for Boston (BQ)?
This page paces the Boston course itself. To find the time your age and gender need to qualify, use the linked Boston qualifier calculator — and remember that meeting the published standard does not guarantee entry in oversubscribed years, when a cutoff buffer applies.
Should I run even splits or negative splits at Boston?
Neither in clock terms — you want even effort, which on this course means slightly slower-than-average early (down the Hopkinton hill, to protect your quads), steady through the middle, slower again up the Newton Hills, then whatever your legs have left on the descent to Boylston. The split table here translates that effort into the actual pace for each section.
Estimates only. Segment elevations are approximate, drawn from public course profiles, and your real splits depend on fitness, fuelling, weather and pacing discipline on the day. Not medical or coaching advice.