Welcome to the webpage of the

Marco Groot Memorial – HoHo100 

In remembrance of Marco Groot, co-founder of the HoHo100; 1967-2023

Information edition 2024

On Saturday 27th of January the second edition of this ultra event will take place in the city of Amersfoort. Amersfoort is situated in the middle of the Netherlands.What, when, where, who?

What: 100 Miles & 100 Kilometers

When 100 Miles: The start is on Saturday 27th of January 2024 at 8:30 AM for the 100 Miles . You can finish until Sunday 28th of January 2023 6:30 AM. So, the maximum time to complete the 100 Miles is 22 hours.

When 100 Kilometers: The start is on Saturday 27th of January 2024 at 10:30 AM for the 100 Kilometers . You can finish until Sunday 28th of January 2024 6:30 AM. So, the maximum time to complete the 100 Kilometers is 20 hours.

Where: Altis, Schothorsterlaan 78, 3822 NB Amersfoort, the Netherlands.

Maximum number of participants: 50 for each distance

Contact: info@run033.nl

Race Director: Mark van Hoorn


The course is officially measured by the Dutch Athletics Federation.

The start-up round of the 100 Miles has a length of 1670.65m. After the start-up round you have to accomplish 43 full rounds of 3703.81m.

The start is of the 100 Kilometers is at the finish line. You have to accomplish 27 full rounds of 3703,81m. Then the total distance will be 100,00287 Kilometers. So, the course will be 2,87m too long.

The course has no mentionable altitude meters. The course is not traffic-free. Mainly bikes and scooters will be on the course and sometimes a lost car. The underground is mixed: tartan track, asphalt and small cobblestones.

Click on the map to go to afstandmeten.nl to see the course in more detail. The start of the 100 Miles is at the “A” on the map. The finish is at the F, which is also the start of the 100 Kilometers.

Spartathlon qualifier

The HoHo-100 can be used as a qualification for the Spartathlon. The subscription period for the Spartathlon mostly ends at the end of February. The Spartathlon website has not been yet updated for the edition of 2024. For the edition of 2023 the qualifying times were:

  • Finish a 100-mile race in 21:00 hours (men) or 22:00 hours (women).
  • Runners having achieved a performance at least 25% better than the ones required in section 2, are considered qualified and are thus automatically admitted. Adjustment by HoHo-100: This means for the 100 Miles 15:45 hours (men) or 16:30 hours (women).
  • There should be 5 finishers at least

Participation fees


Early Bird Regular Late Bird
till November, 12 from November, 13 till January, 7 from January, 8 till January, 26
100 Miles € 50 € 60 € 70
100 Kilometers € 40 € 50 € 60

What is included in the participation fee?

  • Officially measured course
  • Electronic timing (including lap times)
  • Toilets, dressing rooms and showers
  • A sports canteen where your supporter(s), if you have any, can shelter warmly
  • A sports canteen where your supporter can warmup some food for you
  • A spot around start/finish where you can put your own food and drinks
  • The organisation provides also some food:
    • Bread between 12:00 and 14:00hours
    • Soup with meat or vegetarian (starting around 18:00 hours and the continually to the end of the race
    • Pasta with meat or vegetarian, between 18:00 and 20:00 hours
    • Tea and Coffee
    • Water, Coca Cola, bars, bananas also available
    • No Sports drinks, because we see at other ultra events that ultra runners mainly use their own sports drinks
  • Basic Medical Support

Prize money

For the women and men there is prize money for the first three finishers:

  • 100 Miles: € 200, € 150 and € 100
  • 100 Kilometers: € 100, € 75 and € 50

We will transfer the price money to your bank account.

The first three finishers will also get a trophy just after their finish.

Participants started at the 100 Miles can stop after 100km. Their results will be published at DUV Statistik. But these participants can’t win any prize money and trophy.

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