Copenhagen Half Marathon

Half marathon in Copenhagen, normally held in September. A mixed half marathon course — One of the fastest half marathon courses in the world; World Athletics Gold Label.

The Copenhagen Half Marathon at a glance

Distances	Half marathon
Main distance	21.1 km (half marathon)
Usually held	September
Course	Mixed
City	Copenhagen, Denmark
Typical conditions	17.7°C high / 12.9°C low, rain on ~38% of days

One of the fastest half marathon courses in the world; World Athletics Gold Label.

Entering the Copenhagen Half Marathon

Entry fees, closing dates and start times are set by the organiser and change every year, so they are not reproduced here — a stale deadline is worse than none. The organiser’s own site and its social channels are the authoritative source for the current year, and are where entry opens.

What is stable, and what this page covers: the month the race is held, what the course is like, the conditions you should expect, and how long a build-up the distance needs.

Weather at previous Copenhagen Half Marathon races

Across the last ten years, Copenhagen in September has averaged a daily high of 17.7°C and a low of 12.9°C, with at least a millimetre of rain on about 38% of days.

These are recorded observations for the race month averaged over ten years, not a forecast and not a single past race day — race dates move, so one day’s figures would mislead. Source: Open-Meteo historical archive.

How to prepare for the Copenhagen Half Marathon

How long to train

Build for 12 to 14 weeks from a base you already hold rather than from nothing. For half marathon the block should peak at a longest run of 18–20 km, reached at least two weeks before race day so there is time to taper. Ten days of reduced volume is enough of a taper at this distance; keep one short session at race pace in the final week.

Training for this course

The course mixes surfaces and gradients, so build a training block that does the same rather than repeating one flat loop. Vary where you run week to week so nothing on race day is unfamiliar.

Conditions in September

Conditions are usually good for racing: highs average 17.7°C and lows 12.9°C in September, which is close to ideal for half marathon running. Dress for the temperature about ten degrees warmer than it actually is, since you will warm up within two kilometres. Rain is common — around 38% of days that month see at least a millimetre — so do some training runs wet and know which kit does not chafe.

Fuelling

A half marathon needs one gel or its equivalent around the hour mark for most runners, and a normal breakfast two to three hours before the start. Practise the same timing in at least three long runs so race morning is a repeat, not an experiment.

Race week

Sleep matters most two nights before, not the night before, so protect that one. Keep eating normally with a modest tilt toward carbohydrate, lay out kit the night before, and do nothing new: no new shoes, no new breakfast, no new socks. Plan to arrive at the start with time to spare — half marathon fields move slowly through bag drop and security.

Distances and where the race is run

Half marathon — 21.1 km

The pin marks Copenhagen city centre, the area the Copenhagen Half Marathon starts and finishes in. This is not the course line: the route is set by the organiser and changes between editions, so the official course map for the current year is theirs to publish. The routes below are for training on the same roads.

Train on these roads: 10K routes in Copenhagen · long runs in Copenhagen · GPS art routes

Other races in Copenhagen

Copenhagen Marathon — Marathon, May
Royal Run — 10K, 5K, June

Full Copenhagen race calendar