Amsterdam 100 is a 100km ultra marathon in Amsterdam, Netherlands. Distance: 100km. Elevation: 50m D+. Difficulty: accessible (Challenge Rating 23/100). DNF rate: 10%. Time limit: 16h. Surface: mixed. Established 2018.
Amsterdam 100
Amsterdam, North Holland, Netherlands
"100km through the Dutch polders. Windmills, canals, and the flattest ultra course on Earth."
The world's flattest 100km — through Dutch polders, along canals, and past windmills with virtually zero elevation.
The Course
A completely flat loop through the polders, canals, and countryside surrounding Amsterdam. The course runs along dykes, through small Dutch villages, past windmills, and along canal towpaths. The flattest 100km race in the world.
flat
loop
10
Runner Experience
Standard aid station support with food, drinks, and basic medical assistance at regular intervals.
Warm, inclusive finish line with a strong community feel. Runners celebrate together regardless of finish time.
Race Day Weather
10°C
6° – 14°
80%
40%
Dutch autumn — cool, damp, and often windy. The flat, open polder landscape means no shelter from wind or rain.
Stats & Records
2018
600
12:00:00
Entry
€95
January
months
Lore & Trivia
The Amsterdam 100 is one of the flattest ultra marathons in the world — the Netherlands famously has no hills. The course follows canal paths, dyke tops, and polder roads through the waterlogged landscape that the Dutch reclaimed from the sea. Running 100km without a single meaningful climb sounds easy until you try it: the wind, the monotony, and the absence of terrain variation create a psychological challenge that mountainous races don't.
- ▸ With 50m total elevation over 100km, this may be the flattest 100km race on the planet.
- ▸ The course passes through classic Dutch polder landscape — land reclaimed from the sea below sea level.
- ▸ Windmills, cheese farms, and tulip fields line the route in season.
- ▸ The Netherlands is one of the world's flattest countries — perfect for fast 100km times.
- ▸ Established in 2018.
The flattest hundred on earth. No hills to blame — just you and the Dutch landscape for 100 kilometres.
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Frequently Asked Questions
How long is Amsterdam 100? +
Amsterdam 100 is a 100km (100km) ultra marathon with 50m of elevation gain. The course is loop on mixed terrain.
How hard is Amsterdam 100? +
Amsterdam 100 is rated accessible with a Challenge Rating of 23/100 (Moderate). The DNF rate is 10%. Runners have 16 hours to finish.
What is the weather like at Amsterdam 100? +
Average temperature is 10°C (range 6°C to 14°C) with 80% humidity and a 40% chance of rain. Dutch autumn — cool, damp, and often windy. The flat, open polder landscape means no shelter from wind or rain.
Are crew and pacers allowed at Amsterdam 100? +
Crew access is allowed. Pacers are allowed.
What is the average finish time for Amsterdam 100? +
The average finish time is 12:00:00. About 600 runners finish each year. The DNF rate is 10%.
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