Grandmas Marathon
Duluth, United States of America · Sunday 20 June 2027
Grandma's Marathon is an annual 26.2-mile (42.2 km) road race held each June in northeastern Minnesota, United States, starting just south of Two Harbors and following Scenic Route 61 along the shore of Lake Superior to finish in Canal Park, Duluth. The point-to-point course features gently rolling hills with a net downhill profile, providing varied terrain and scenic lake views. The final miles pass through downtown Duluth, culminating near a prominent local landmark, the Aerial Lift Bridge.
Difficulty Calculator
h
:m
:s
Adjusted Time
4:39:18
Time difference: +39.3 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain170m
Elevation High225m
Elevation Low184m
Weather Forecast
High22°C
Low10°C
Chance of Rain13%
How hard is Grandmas Marathon?
Very Difficultharder than 91% of marathons
Flattest / easiestHardest
On our difficulty model, Grandmas Marathon plays about 40 minutes slower than an average road marathon for a 3:30 runner. It ranks #105 hardest of 1150 marathons we analyse, and #50 of 575 in United States of America. Use the calculator above to see the exact adjusted time for your own goal pace.
What will you run at Grandmas Marathon?
Estimated finish times on this course versus the same effort on an average road marathon, based on its elevation, surface, and expected race-day temperature.
| Average-course time | On Grandmas Marathon | Difference |
|---|---|---|
| 3:00:00 | 3:30:58 | +30:58 |
| 3:30:00 | 4:05:14 | +35:14 |
| 4:00:00 | 4:39:18 | +39:18 |
| 4:30:00 | 5:13:13 | +43:13 |
| 5:00:00 | 5:47:04 | +47:04 |
| 5:30:00 | 6:20:51 | +50:51 |
| 6:00:00 | 6:54:37 | +54:37 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Grandmas Marathon 2027 Course Analysis
Grandmas Marathon is a full marathon held in Duluth, United States of America. It is scheduled for Sunday 20 June 2027. The course is run on trail surface with 170m of total climbing, with its high point near 225m above sea level. For registration and full race details, visit the official Grandmas Marathon website.
Elevation Profile
With 170m of total climbing, this is a gently undulating course. The elevation changes are manageable for most runners and shouldn't greatly affect your pacing.
Expected Race Day Weather
Based on historical weather data for June, the expected race day conditions are as follows. Moderate temperatures between 10°C and 22°C are expected. While comfortable for most runners, those targeting fast times should pay attention to hydration, as these temperatures can impact performance on race day. There is a low chance of rain (13%), so dry conditions are likely.
Surface Type: Trail
Grandmas Marathon is a trail race, meaning the course includes unpaved surfaces such as dirt, gravel, or forest paths. Trail surfaces are usually slower than the road equivalent - often by 10-20% - because of uneven footing, technical sections, and frequently steeper gradients, though a smooth, non-technical or downhill trail can run faster than that suggests. Trail-specific shoes with good grip are recommended.
Looking for an easier marathon or a tougher challenge? You can also compare Grandmas Marathon against other marathons to find the right race for your goals.
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