Copenhagen 100 is a 100km ultra marathon in Copenhagen, Denmark. Distance: 100km. Elevation: 500m D+. Difficulty: moderate (Challenge Rating 24/100). DNF rate: 15%. Time limit: 16h. Surface: mixed. Established 2011.
Copenhagen 100
Copenhagen, Capital Region, Denmark
"100km around Copenhagen — flat, fast, and nowhere to hide. Pure endurance on Danish coastal and forest paths."
One of Europe's flattest 100km races — a fast loop around Copenhagen through deer parks, coastal paths, and Danish forest trails.
The Course
A flat 100km loop around the Greater Copenhagen area following coastal paths, forest trails through Dyrehaven (the Deer Park), and urban greenways. Denmark's flattest country ensures this is a pure endurance test with no climbing to blame for slow times.
flat
loop
10
50m
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
16°C
10° – 22°
70%
30%
Danish summer. Pleasant, mild conditions. Long daylight hours. Breezy along the coast.
Stats & Records
2011
300
12:00:00
6:55:22
Jonas Nielsen (2023)
8:12:33
Mette Johansen (2022)
Entry
DKK 900
January
months
Lore & Trivia
Ultra Copenhagen 100 brings the 100-mile distance to Denmark — a country with no mountains, no wilderness, and no obvious reason to host an ultra. Yet the flat terrain creates its own challenge: wind, monotony, and the absence of terrain variation force runners to confront the pure mental challenge of covering 160km on their own legs. Danish ultra running culture mirrors Danish society: understated, well-organised, and quietly determined.
- ▸ With only 500m of elevation gain, this is one of the flattest 100km races in the world — pure endurance, no excuses.
- ▸ Dyrehaven (the Deer Park) section features free-roaming deer — a UNESCO World Heritage site.
- ▸ Copenhagen's cycling culture means the urban path sections are world-class infrastructure.
- ▸ The long Danish summer daylight means most runners finish in daylight hours.
- ▸ Established in 2011.
Copenhagen to the coast and back — Danish design applied to ultra running. Clean, efficient, and surprisingly tough.
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Frequently Asked Questions
How long is Copenhagen 100? +
Copenhagen 100 is a 100km (100km) ultra marathon with 500m of elevation gain. The course is loop on mixed terrain.
How hard is Copenhagen 100? +
Copenhagen 100 is rated moderate with a Challenge Rating of 24/100 (Moderate). The DNF rate is 15%. Runners have 16 hours to finish.
What is the weather like at Copenhagen 100? +
Average temperature is 16°C (range 10°C to 22°C) with 70% humidity and a 30% chance of rain. Danish summer. Pleasant, mild conditions. Long daylight hours. Breezy along the coast.
Are crew and pacers allowed at Copenhagen 100? +
Crew access is allowed. Pacers are allowed.
What is the course record for Copenhagen 100? +
The men's course record is 6:55:22 set by Jonas Nielsen in 2023. The women's course record is 8:12:33 set by Mette Johansen in 2022.
What is the average finish time for Copenhagen 100? +
The average finish time is 12:00:00. About 300 runners finish each year. The DNF rate is 15%.
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