RacesReviewed / Race Intelligence

Grandma's Marathon

Half Marathon2026-06-20

Ready for an unforgettable adventure?

RegisterOpen signupgrandmasmarathon.comLocationDuluth, MNRace start area

Choose your distance

5 KMarathonHalf Marathon

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Course format

Park course built for speed

Point-to-point.

Elevation profile

4 ft net down

427 ft up and 432 ft down across the Half Marathon. Net flat overall.

Pressure point

Mid-race climb

The key move builds from about mile 7.6 to 8, gaining roughly 51 ft.

Weather bias

Heat can decide the day

This is a summer race, so plan for warm pavement, hydration, and a race-week forecast check.

Free training plan

Build a free Half Marathon plan for this race.

Keep race research first. When you want it, open a quick planner that uses the selected distance, the selected race date, and the course itself.

Course Profile

Grandma's Marathon Half Marathon course profile

Full course view

This course section is built from a mapped route and elevation profile so you can understand how the race is likely to run.

Synced course focus

Half Marathon checkpoint 2

Mile 1.5 · 587 ft · Built from the stored course profile in Supabase.

Course trace

The route line and elevation chart reflect the selected distance.

Pressure model

Pressure points highlight where pacing or effort may change during the race.

What comes next

Use the course, weather, logistics, and reviews together to build your race-day plan.

Difficulty Meter

Half Marathon race demand

Course-based read
84/100
Course detail
Detailed
Weather detail
Historical + forecast
Race-day detail
Moderate
Weather view
Live forecast

Weather read

Strong headwind penalty

Route-aligned wind gives you a quick feel for how the day may race before you dig into the full weather section.

Jump to weather analysis

Weather Analysis

Grandma's Marathon Half Marathon weather outlook

Forecast + history

Weather blends the live forecast with the race's historical weather patterns to help you plan.

Route-aligned wind

-6.4 mph

Interpretation

Strong headwind penalty

NOAA race-window forecast is live. Wind is scored relative to the course bearing where possible.

Course bearing 230.0 degAverage wind 8.3 mphDominant direction W

Estimated weather effect

+3.69%

Heuristic read

Major weather drag

Help score

-66

Historical profile

Historical weather summary not available yet

Historical weather coverage is still limited for this race.

Avg start temp N/AAvg wind N/AAligned wind N/A

Tailwind years

N/A

Headwind years

N/A

Helpful weather

N/A

Forecasts use current race-area weather, and history looks at past race-weekend conditions to show what runners have typically faced.

Weather history

Historical years not available yet

Historical weather years are not available for this race yet.

Start

80F

Sunny

5.0 mph · W

Mid-course

76F

Sunny

10.0 mph · W

Finish

84F

Mostly Sunny

10.0 mph · W

Course Breakdown

Where the half-marathon tells its story

Pacing watchpoints

Active segment

Half rhythm

This is a deterministic pacing band built from the available course trace and race distance.

Avg grade -1.1 ft/miFocused mile 1.5Pacing watchpoint

Race-Day Logistics

Grandma's Marathon Half Marathon race-day logistics

Planning basics

Race weekend

1 recorded year

The basic race structure is in place for planning.

Distance options

3 distances

This page can show the event correctly even when some race-day detail is still light.

Race-day planning

More details coming

Packet pickup, parking, support flow, and reunion details may still be limited.

Course Map

Route shape, city context, and key course moments in one view.

Map + course context

Map overview

This map follows the available route for the selected distance and stays in sync with the elevation chart.

Highlighted point

Half Marathon checkpoint 2

Built from the stored course profile in Supabase.

Mile 1.5587 ftOpening settle

What to watch

Use this map to spot turns, neighborhoods, and where the race starts to feel different.

Course coverage

Route shape and elevation are available, while aid stations and spectator overlays may still be added over time.

Why it matters

Duluth, MN should still be easy to plan around, even when some course details are lighter than others.

Planning

Use the Half Marathon at Grandma's Marathon as a planning target rather than a qualification race.

Open entry

Entry posture

Open entry

There is no qualification signal in the current event record.

Race framing

Half Marathon planning

The page emphasizes course, logistics, and weather rather than qualification standards.

Grandma's Marathon official siteRegistration

Race History

Race history overview

Some history available

Past editions tracked

1

Recorded race years

Archive

Current route view

Available

Half Marathon

Current

Benchmarks

Growing archive

More historical context will be added here as the archive grows

In progress

Review Radar

Runner signal for Grandma's Marathon Half Marathon

Runner reviews live
CourseCourseLogisticsLogisticsCrowd supportCrowd supportAid stationsAid stationsFinish areaFinish areaRecommendRecommend

Course

87/100

Logistics

50/100

Crowd support

100/100

Aid stations

80/100

Finish area

100/100

Recommend

87/100

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