Race Discovery
G.R.A. 100 Mile CHALLENGE
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G.R.A. 100 Mile CHALLENGE

Grayling, Michigan, United States View on map
May 01, 2026 – Oct 31, 2026 (America/Detroit local time)
Running

About this race

A great way to start your exercise program through the spring and summer is keeping track of your progress. Register in the 100 Mile Challenge, track your miles walking/hiking, biking, kayaking or running. The goal is to get a minimum of 100 miles. Program is free without custom shirt. Pay $25 and receive a customized long sleeve T-shirt. The shirts have a custom design graphic on the front, the back of the shirts will list participants names with the amount of miles they have achieved by October 31, 2026. Price reflects shirt being pick up at Hanson Hills. We can ship your shirt for an additional $10 fee. Miles are logged on the honor system and can be done at the location of your choice. Results need to be turned in before November 7th by phone 989-348-9266 Ext. 201 or Email, Programs@hansonhills.org

Pick your distance

Running

G.R.A. 100 Mile Challenge (FREE/NO Shirt)

May 01, 2026 Ultra 12:00 AM
Free
Closed

G.R.A. 100 Mile Challenge (T-Shirt Option)

May 01, 2026 Ultra 12:00 AM
$25.00
Closed

Typical race-day weather

Based on 13 years of Open-Meteo archive data for this event's race dates in Grayling, plus the 3 days either side.

Temp (°C)
Minimum temperature (race-week average) 11.3° / Maximum temperature (race-week average) 22.6°
Feels Like (°C)
Minimum feels like — heat index / wind chill (race-week average) 10.1° / Maximum feels like — heat index / wind chill (race-week average) 23.4°
Peak wind (km/h)
Strongest wind of the day (race-week average)
16.7
Precip (mm)
Precipitation over the day (race-week average)
2.5mm
Humidity
Mean relative humidity (race-week average)
70.3%
Sunrise
Sunrise at the start line on May 1, 2026 (EDT)
Sunset
Sunset at the start line on May 1, 2026 (EDT)
Daylight
Hours between sunrise and sunset on race day
14h 15m

The sun rises at 6:28 AM and sets at 8:43 PM local time (EDT) in Grayling on May 1, 2026 — 14h 15m of daylight.

Course

No course map published yet.

The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.

Reviews

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Results — G.R.A. 100 Mile CHALLENGE

2022 edition View Results

Other races near Grayling

Different organizers, within 40 miles, in the next three months

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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.

  • Entries, prices, waves and inclusions — the event's official registration page
  • Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
  • Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
  • Comparisons and counts — Race Discovery calendar, 16 Grayling events

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