Grandma’s Marathon takes place on Sat, Jun 19, 2027 in Duluth, United States. The main route is 42.2 km.
- Date
- Sat, Jun 19, 2027
- Start
- Duluth 🇺🇸
- Distance
- 42.2 km
- Level
- Open to all
Your 37-week plan to Grandma’s Marathon
The Base phase starts this week. Built around your fitness and adjusted every day as your form changes; attach the course and it prepares for the climbs too.
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The Grandma’s Marathon course is a picturesque, point-to-point 26.2-mile stretch along the scenic shores of Lake Superior with rolling hills and a net downhill elevation.
What this race demands
Grandma's Marathon demands sustained endurance over a standard 42.2-kilometer point-to-point running distance along Lake Superior.
Aerobic endurance
The standard marathon distance requires sustained cardiovascular capacity and muscular endurance over 42.2 kilometers.
Downhill management
The net downhill elevation profile places repeated eccentric loading on the quadriceps during the rolling sections along the course.
Aim for 60 to 90 grams of carbohydrates per hour to sustain output over the multi-hour marathon duration.
What would it take you?
Pick the level closest to yours for an estimate of finish time on this course and the training a solid preparation needs.
Estimated finish
3:45–4:30
Peak-week training
5–7 h/week
A model estimate from distance, climbing and level, not a promise. Conditions, drafting and pacing move it.
IntervalCoach turns those weekly hours into a concrete plan built around your actual fitness. Start with this race as your goal
Your road to race day
Race day at Grandma’s Marathon is 37 weeks away. This is how a coach divides that time. The first phase starts now.
01Base25 weeks · Oct 4, 2026 – Mar 27, 2027
Aerobic foundation: mostly steady endurance work that grows the aerobic engine and the durability the later phases stand on.
02Build6 weeks · Mar 28, 2027 – May 8, 2027
Progressive overload: training load climbs in waves, with harder weeks stacked on the base and planned recovery weeks that let the gains land.
03Peak3 weeks · May 9, 2027 – May 29, 2027
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
04Taper2 weeks · May 30, 2027 – Jun 12, 2027
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
05Race week1 week · Jun 13, 2027 – Jun 19, 2027
Openers, rest and logistics. The work is done; the job now is arriving fresh.
Frequently asked questions
When is Grandma’s Marathon?
Grandma’s Marathon takes place on Sat, Jun 19, 2027 in Duluth, United States.
How long is Grandma’s Marathon?
The main route is 42.2 km.
What does Grandma’s Marathon demand?
Grandma's Marathon demands sustained endurance over a standard 42.2-kilometer point-to-point running distance along Lake Superior.
Who is Grandma’s Marathon for?
Grandma’s Marathon is open to all participants.
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