IRONMAN Copenhagen

Copenhagen, Denmark · August · IRONMAN

IRONMAN Copenhagen: nyhavn, cityPhoto is not from race daySuperbass, CC BY-SA 4.0
Nyhavn, city. Photo via Wikimedia Commons.

Why people love it

  • Top-tier crowd support on a four-loop city run
  • Calm, shallow lagoon swim at 18-22 °C (64-72 °F), wetsuit legal almost every year
  • Fast, scenic bike on closed roads
  • Forum consensus: a great first IRONMAN

Watch out for

  • Cold rain and wind possible (2017, 2019); typical air 14-24 °C (57-75 °F)
  • Split transitions with a 4:30 a.m. transfer
  • Wind on the coastal bike section and cobbles in one village
  • Expensive city; sells out (2027 reported full)

Race

4.6Excellent

How racers feel about it, how well it is run, and how it treats a first timer. Counts for 27% of the overall score.

  • Racer satisfactionLoved4.4

    Consistently praised as a great first IRONMAN with a city atmosphere, per Slowtwitch posters. Weather in 2017 and 2019 was a downer for some. · Medium confidence

  • OrganizationWell run4.4

    Posters call it well coordinated. Minor complaints only: stairs for bike pickup and split transitions. · Medium confidence

  • First timer friendlyFriendly4.3

    Repeatedly recommended for a first IRONMAN: sheltered lagoon, closed roads and deep crowds. Split transitions, wind and cobbles temper it. · Medium confidence

Course traits, not part of the score

  • PR potentialFast3.7

    Flat-to-rolling bike (650-1,000 m (2,130–3,280 ft) / 2,100-3,300 ft by source) and a very flat run. Coastal wind and cobbles cost time. · Medium confidence

  • Course easeModerate3.8

    Flat to rolling and rarely hot. Coastal wind, cold rain (2017, 2019) and 650-1,000 m (2,100-3,300 ft) of gain are the challenges. · Medium confidence

Swim

4.5Excellent

Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 15% of the overall score.

  • Wetsuit legalAlmost always4.8

    Water is typically 18-22 °C (64-72 °F), under the 24.5 °C (76.1 °F) limit. Wetsuits are legal almost every year. · Medium confidence

  • Water temperatureIdeal4.7

    Water is typically 18-22 °C (64-72 °F), comfortable for most swimmers. · Medium confidence

  • Calm waterMostly calm4.3

    A shallow, sheltered lagoon. A 2019 slow finisher still noted waves and jellyfish. · Medium confidence

  • Swim easeVery easy4.5

    Easy to navigate, calm, shielded and clear, which suits first-timers. · Medium confidence

  • Swim experienceGreat4.0

    Bridges lined with spectators and clear sandy-bottom water. A shallow lagoon, and jellyfish in 2019. · Medium confidence

Bike

4.1Very good

Road surface, closures, scenery and wind. Counts for 19% of the overall score.

  • Road surfaceMixed3.4

    Closed roads and a cobbled village section. No detailed surface data. · Low confidence

  • Road closuresFully closed4.5

    Closed roads and marshalled junctions, per a 2019 finisher. · Medium confidence

  • Bike sceneryBeautiful3.9

    Waterfront past Amalienborg and quiet countryside north of the city. · Medium confidence

  • WindSome wind2.6

    A windy stretch up the coast out of the city. 'Copenhagen can be windy', said a 2019 racer. · Medium confidence

Course traits, not part of the score

  • Bike speedFast3.7

    Fast on closed roads, but coastal wind, cobbles in one village and a rolling back half. One poster found it easier than Zurich. · Medium confidence

  • Bike flatnessMostly flat4.0

    Sources disagree: about 650 m (2,100 ft) or 1,000 m (3,300 ft). Short climbs of 20-26 m (66-85 ft) at up to 5%. · Low confidence

  • Bike simplicitySome technical parts3.4

    City exit and cobbles in one village. Otherwise simple. · Low confidence

Run

4.6Excellent

Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.

  • Crowd supportElectric4.8

    Four city loops with crowds several people deep. Multiple posters rave. · High confidence

  • Aid stationsGood4.0

    City laps with frequent access. No explicit aid data. · Low confidence

  • Run sceneryBeautiful4.3

    Canals, city sights and a finish by Parliament. · Medium confidence

  • Run conditionsEasy4.1

    Flat and cool: 'almost guaranteed it won't be too hot'. Cobbles and tight crowds in places. · Medium confidence

Course traits, not part of the score

  • Run flatnessMostly flat4.4

    Very flat per posters, with a few short steep rises, turns and cobbles. · Medium confidence

Conditions

4.5Very good

Air temperature, how predictable the weather is, setting, and spectating. Counts for 15% of the overall score.

  • Air temperatureIdeal4.6

    Race-day air is typically 14-24 °C (57-75 °F). Heat is rarely an issue, but cold rain hit in 2017 and 2019. · Medium confidence

  • Weather reliabilityVariable2.7

    Cold, wind and rain in 2017 and 2019, and grey and wet in the 2010 debut. Sunny 21 °C (70 °F) in 2016. · Medium confidence

  • Venue beautyLovely4.4

    Capital city waterfront, canals and Amager beach. · Medium confidence

  • Spectator friendlySee them often4.5

    Compact for spectators, with bridges on the swim and many run viewing points. · Medium confidence

Course traits, not part of the score

  • Low altitudeSea level5.0

    About 5 m (16 ft) above sea level. · High confidence

Stay and travel

4.0Very good

Hotels, walkability, getting there, and the town around the race. Counts for 11% of the overall score.

  • Hotel availabilityGood3.5

    A large capital with many hotels. No race-week sell-out data. · Low confidence

  • Hotel valuePricey2.4

    Copenhagen is an expensive city. No race-week price data found. · Low confidence

  • WalkabilityWalkable3.5

    A metro every 10 minutes or so from downtown to a short walk from T1. Transitions are split. · Medium confidence

  • Travel easeVery easy4.8

    A major international hub with direct flights from North America. · Medium confidence

  • LogisticsSome complexity2.8

    Separate T1 and T2 and 4:30 a.m. transfers, but an easy metro and plentiful taxis. · Medium confidence

  • Town and foodGreat4.6

    A major European capital with food and sights. Post-race beer by the water is praised. · Medium confidence

Key facts

Location
Copenhagen, Capital Region, Denmark
Typical month
August
Organiser
IRONMAN
First held
2010
Distances
3.8 km (2.4 mi) swim, 180 km (112 mi) bike, 42.2 km (26.2 mi) run
Cutoffs
Finish 15:45
Swim venue
Amager Beach Park lagoon (ocean)
Water temperature
18–22 °C (64–72 °F)
Wetsuit
Legal
Swim start
rolling
Bike laps
2
Run laps
4
Run shade
Urban
Air temperature
14–24 °C (57–75 °F)
Humidity
Moderate
Altitude
5 m (16 ft)
Nearest airport
Copenhagen Airport (CPH)
Where to stay
Central Copenhagen
Booking
Staying in the centre recommended; metro goes to near T1.

Official race website (ironman.com)

What racers and reviewers say

  • Slowtwitch forum (Sullbk)Raced 2016 · forum · Positive

    First-time Copenhagen racer describing a sheltered swim past bridges where family can watch, a rolling bike with one hill, and a four-lap run with strong support. Weather around 21 °C (70 °F).

  • Slowtwitch forum (Dan_Funk)Raced 2016 · forum · Positive

    Very sheltered, easy-to-navigate swim, a scenic but unchallenging bike, and a four-lap city run with deep crowds. Notes the compact layout and that heat is rarely an issue.

    “almost guaranteed it won't be too hot”

    Dan_Funk
  • Slowtwitch forum (JoeO)Raced 2016 · forum · Mixed

    Found the bike easier than Zurich. Run is four loops with short steep rises, turns, cobbles and tight crowds. Had a rough run, which may colour the view.

  • Slowtwitch forum (SweMike)Raced 2011 · forum · Positive

    Raced the first two editions. Swim is calm, shielded and clear. Bike is two loops with cobbles in one village. Run was awesome. T1 and T2 are separate but the train station is walkable to most of the city.

  • Slowtwitch forum (Eltito)Raced 2019 · forum · Positive

    Bike fast, run very flat and entirely in the city with lots of spectators. Warns Copenhagen can be windy.

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  • Slowtwitch forum (Triingtotrain)Raced 2018 · forum · Positive

    Loved the whole race and enjoyed beer by the water afterwards. Later compared the Tallinn recovery tent unfavourably to Copenhagen's.

  • Slowtwitch forum threadRaced 2017 · forum · Positive

    Posters from 2015-2019 describe a shallow sheltered lagoon around 18-22 °C (64-72 °F), a flat-to-rolling bike with a windy coastal stretch, cold and rain in 2017, and a flat city run with excellent spectators. Metro runs from downtown to near T1; staying central is advised.

  • Highwood Group newsRaced 2019 · blog · Positive

    Slow-paced finisher (14:53, cutoff 15:45) describes waves and jellyfish in the Amager swim, closed marshalled roads and rain on the second bike loop, and a four-loop run along the canals finishing before the Parliament.

  • Slowtwitch forumRaced 2026 · forum · Positive

    Thread notes Copenhagen and Kalmar sold out for next year; Copenhagen has rolling hills on the back half. Poster recalls a 2018 marathon PR there.

  • SlowtwitchRaced 2010 · article · Mixed

    Report on the debut edition (then Challenge): swim in a lagoon behind Amager Strand, bike past Amalienborg and the waterfront, three-loop run along the waterfront in grey, wet weather. Course has since changed to four run loops.

Sources

Pages we used for facts and ratings. See how we rate.

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