Free tool
Compare marathons
Side-by-side comparison of elevation, PB potential, beginner friendliness, terrain, weather, and entry details. Pick two races and see how they stack up.
Race A
vs
Race B
Race A
Tamarack Ottawa Marathon
Best for
Strong PB attemptsNewer marathonersFlat-course PBs
Race B
Boston Marathon
Best for
World Major bucket-list
Race A
Tamarack Ottawa Marathon
Ottawa, Canada
Race B
Boston Marathon
Boston, USA
Date
Expected May 2027
Expected April 2027
Month
May
Apr
Location
🇨🇦 Ottawa, Canada
🇺🇸 Boston, USA
Terrain
Road
Road
Elevation gain
▲
95 m
247 m
PB potential
▲
Beginner friendly
▲
World Major
No
✓ Yes
Entry type
Open
Qualifier
Entry status
Check official site
Check official site
Season
Spring · Americas
Spring · Americas
Race-day temp.
10–19°C
8–16°C
Conditions
Canadian spring — tulip season, often sunny
Variable — can be ideal or brutal
Humidity
50–65%
50–70%
Wind
10–20 km/h
Variable 10–25 km/h
Qualifies for
Boston Marathon
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Want to know how these scores are calculated? See methodology →