Course profile is extremely flat, contributing to a PR score of 99.55, indicating excellent conditions for speed.
Only 89 finishers, creating a small-field dynamic that allows for easier navigation and fewer crowd-related obstacles.
21.3% of participants qualify for Boston, reflecting the race's challenging yet attainable standards.
The race takes place in May, when running conditions in Boston are generally mild, aiding in performance.
A remarkable 21.3% of finishers at the Charles River Marathon qualify for Boston, making this race notably competitive. Set against the backdrop of Boston’s vibrant scenery, the course is exceptionally flat, with a PR score of 99.55 that suggests minimal elevation change. With just 89 finishers in 2026, expect a more intimate atmosphere compared to larger marathons, allowing for a focused race day experience.
Focus on maintaining a consistent effort throughout the race, as the flat profile allows for a steady rhythm. Position yourself early to avoid congestion, and take advantage of the smaller field to run unimpeded.
Detailed elevation profile data is being prepared for this race. Check back soon for interactive course analysis.
Historical average based on 3-year data for this race date
Temp
63.3°F / 47.1°F
Conditions
Rainy
Precipitation
0.04 in
Wind
11.9 mph
Historical averages · Source: Open-Meteo · Actual conditions will vary
Find accommodation for race weekend in Boston, MA.
Hotel links may earn a small commission at no cost to you.
Fast Course Briefing
One email per month. Course trends, registration deadlines, and editor-picked qualifiers.