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Race IntelligenceCopenhagen, Denmark

IRONMAN Copenhagen

Know your day before you race it.

Enter four numbers you already train with. You get a likely finish range, target paces and watts, and how I would race this course.

Race day
22 August 2027
Swim
3.8 km
Bike
180 km
Run
42.2 km

Published route evidence. Final 2027 route pending. Checked 15 Sept 2026.

Official course routeThe real GPS route for each discipline with official GPX data available, drawn in one shared coordinate space.

01 Race Card

Build my Race Card

Your first range uses conservative assumptions. Add optional evidence to make it more specific. It is calculated in your browser and saved only on this device.

Your numbers
Distance unit
Weight unit
You and this race
Sharpen your range with more detailOptional. Recent swim, bike and run results, equipment and transitions.

Add only the evidence you have. Every control changes a discipline range, its uncertainty, or an execution-risk explanation.

Swim evidence

Replaces the broad pool-to-open-water assumption.

Bike and equipment

These replace broad mass, aerodynamics, tyre, and power-to-speed assumptions.

Run evidence

A recent effort and honest durability/acclimation answers refine the post-bike run.

Race execution

Transition proficiency changes the T1/T2 range and how wet conditions are treated.

02 The course

What Copenhagen actually gives you

You swim one protected loop at Amager Strandpark, ride two rolling loops through North Zealand and its exposed coast, then run four loops through Copenhagen's waterfront and city centre. It is a fast-feeling course with enough wind and repetition to punish early ambition; even pacing turns its landmarks into useful checkpoints.

Show distances in

Swim

3.8 km

Protected Lagoon, One Loop

Layout
1 loop
Setting
Amager Strandpark

A protected one-loop swim at Amager Strandpark provides a calm, simple start.

Source: 2026 current course

Bike

180 km

Rolling Coastal and Forest Roads, Two Loops

Layout
2 loops
Setting
North Zealand and the coastal roads north of Copenhagen

Two loops through North Zealand combine fast roads with rolling sections and high wind exposure; the course rewards power discipline over speed chasing.

Source: 2026 current course

Run

42.2 km

Urban Waterfront, Four Loops

Layout
4 loops
Setting
Copenhagen waterfront and city centre

Four urban waterfront loops pass Copenhagen landmarks and provide frequent feedback on pacing after the exposed bike.

Source: 2026 current course
Where these course facts come from

These facts come from the organiser’s latest published material: swim, 2026 current course; bike, 2026 current course; run, 2026 current course. They describe the character of the course. They do not confirm the final 2027 route.

03 Race plan

How I’d want you to race it

One job for each part of this course. The distance markers tell you when the job changes. The course tells you why.

Swim

Settle at Amager Strandpark

  1. 0–3800 m

    Amager Strandpark

    Settle in protected water

    The one-loop swim is a chance to establish rhythm without spending matches before the bike.

    • Seed honestly
    • Settle by 400 m

Bike

Two loops, one ceiling

  1. 0 km–90 km

    Loop one through North Zealand

    Keep the fast course honest

    The first loop feels quick, especially with a tailwind. Hold target power and bank no unnecessary effort.

    • Cap power
    • Fuel before exposed sections

  2. 90 km–180 km

    Loop two

    Repeat the same ceiling

    Use the second loop to confirm that the first was paced for the marathon, not for a bike split screenshot.

    • Ignore speed swings
    • Finish nutrition before T2

Run

Use Copenhagen's repeats

  1. 0 km–10.55 km

    Loop one past the harbour

    Let the city come to you

    The four-loop run offers immediate crowd energy. Keep the opening loop controlled regardless of the landmarks.

    • Shorten stride
    • Take aid early

  2. 10.55 km–21.1 km

    Loop two

    Use the second pass as a check

    Repeated landmarks make a steady effort easier to judge than a single long out-and-back.

    • Check posture
    • Stay on nutrition

  3. 21.1 km–31.65 km

    Loop three

    Protect the run

    If the bike was correctly paced, loop three is where patient execution becomes an advantage.

    • Keep cadence
    • Choose effort over split

  4. 31.65 km–42.2 km

    Loop four to Christiansborg

    Spend what you saved

    Make the final move only after the previous loops have held together.

    • Decide late
    • Enjoy the finish

04 Race week

What I would keep an eye on

There is no useful 2027 forecast this far out. For now, past race dates give us a point of reference. Closer to the race, the forecast will tell us whether the plan needs changing.

Forecast statusToo early for a forecast

A race-day forecast is not meaningful yet; check back closer to the event.

Temperature
15.2–22.4°CDew point centred on 13.7°C
Wind and gusts
14.5 km/hGusts up to 48.6 km/hPrevailing direction SW
Rain likelihood
Up to 80%Wet-surface uncertainty retained

Historical baseline, 2019–2025 · Open-Meteo historical archive · Updated 2026-09-15.Historical comparison only. This is not a forecast for 2027.

05 Method

What goes into your range

Your CSS, FTP, weight and run threshold create the first range. Open-water, bike, run and execution evidence can replace broad assumptions. Course data and the historical conditions baseline shape every simulation.

  1. Your numbersCSS · FTP · weight · run threshold
  2. This raceDistance · water type · elevation · exposure
  3. Your Race CardFinish and discipline ranges, with target paces and watts

Confidence is built from four inputs

Athlete evidence
Builds with recent open-water, bike and run efforts
Bike setup
Builds with equipment, mass, aero and tyre detail
Course evidence
Partial while the 2027 route is unconfirmed
Race-week conditions
Historical baseline until a forecast is useful
How the model works

It starts with the targets in your Race Card, then samples the parts of a full distance that vary: open-water pace, transitions, bike speed at the planned power, and the drop in run performance after the swim and bike. Repeating that calculation produces a likely range rather than a single heroic number.

The current time calculation uses this race’s published distances, or standard full distance distances where none are published, with the available course headings, elevation and exposure evidence. Weather scenarios vary temperature, dew point, wind, gusts, rain and water conditions together. Unknown route detail stays visible as uncertainty rather than false precision.

It is not predicting your exact finishing time, placing, or race-day weather. It answers a narrower question: given the plan and the information we have, what range of day is plausible, and where is the uncertainty coming from?

Confidence is not a permanent “low”. It is recalculated across four separate inputs:

  • Your evidence: consistent inputs and recent race-like swim, bike, and run results.
  • Bike setup: measured or specified aerodynamics rather than a broad prior.
  • The course: verified distance and route character, including elevation and technical sections.
  • The conditions: a current forecast is more useful than a historical comparison.

It starts low when those inputs are broad. It can become moderate or high as the evidence improves. A narrower range means better information, not a guarantee.

06 Next steps

If Copenhagen is your race

Your range is built on today’s numbers. The months of training before race day decide what those numbers become.

The work from here.

Self-guided routeFull-distance training plansTraining plans for durable pacing.See the plans Personalised routeWork with me on the whole buildCoaching for joined-up race decisions.See coaching

Further reading

ArticleFull-distance race strategy: calm execution beats chaosPacing discipline for a fast-feeling course.ArticleFix the first ten minutes off the bikeA practical transition into a four-loop run.

Evidence

Sources and verification

Course status: Partially verified. The organiser’s descriptions and latest published route profiles are in use. The final 2027 route is not yet confirmed. Last checked 2026-09-15.