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Race IntelligenceValdivia, Chile

IRONMAN Valdivia

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
29 November 2026
Swim
3.8 km
Bike
180 km
Run
42.2 km

Published route evidence. Final 2026 route pending. Checked 18 Sept 2026.

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 Valdivia actually gives you

You swim one-way down the Calle-Calle River from the CAR Nautico training station in genuinely cold water, ride a fast, flat two-loop 180 km course past Cabo Blanco and the Cayumapu River toward Máfil and the Pichoy Memorial Bridge, then run three loops between Valdivia's riverside Costanera and Avenida España, crossing the city's iconic bridges. This is Chile's first full-distance IRONMAN, built by extending the venue's existing 70.3 course. The cold swim start and a flat bike that averages 37.5 km/h are the two things that actually decide how the day goes.

Show distances in

Swim

3.8 km

River, One-way, Wetsuit Mandatory

Layout
One-way, no loops
Setting
the Calle-Calle River, starting at the CAR Nautico training station

A one-way river swim with little to no current and mandatory wetsuits is straightforward to navigate, but genuinely cold water around 14C is the real early variable.

Source: 2026 current route

Bike

180 km

Fast, Flat, Two Loops

Layout
2 loops
Setting
past Tres Marías airfield, Cabo Blanco, the Cruces and Cayumapu Rivers, Máfil and the Pichoy Memorial Bridge

A fast, flat two-loop course averaging around 37.5 km/h removes terrain as an excuse, so power discipline over two identical loops is what actually decides the leg.

Source: 2026 current route

Run

42.2 km

Flat, Urban, Three Loops

Layout
3 loops between the Costanera and Avenida España
Setting
from Saval Park on Isla Teja, across the Cau-Cau, Calle-Calle and Pedro de Valdivia bridges, along the Costanera

A flat three-loop finish through Valdivia's historic bridges and riverside Costanera gives frequent landmarks and crowd support to check pace against.

Source: 2026 current route
Where these course facts come from

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

Cold water, calm current

  1. 0–3800 m

    One-way down the Calle-Calle River

    Budget for genuinely cold water

    Average water temperature around 14C is cold enough to affect breathing in the first minutes. The current is minimal at start time and wetsuits are mandatory, so navigation is simple; managing the cold is the real task.

    • Expect the first two minutes to feel difficult
    • Settle breathing before settling pace

Bike

A fast, flat course with nothing to check you

  1. 0 km–45 km

    First loop past Cabo Blanco

    Set a ceiling on a course built for speed

    Past Tres Marías airfield and the quiet town of Cabo Blanco, the flat, well-maintained roads make this course genuinely fast. Set a power number you intend to hold for two full loops, not one loop's worth of effort.

    • Cap power in the first 30 minutes
    • Start fuelling early on the smooth roads

  2. 45 km–90 km

    Toward Máfil and the Pichoy Memorial Bridge

    Hold the ceiling through the landmarks

    Passing Máfil around the 37 km mark of each loop and the Pichoy Memorial Bridge near 61 km, use these as checkpoints against your planned power rather than reasons to push.

    • Check power at each landmark
    • Stay on the fuelling schedule

  3. 90 km–180 km

    Second loop, closing the bike

    Match the second loop to the first exactly

    Repeating the same fast, flat terrain, the second loop is the honest test of whether the first was paced or raced. Hold the same number to the line.

    • Compare effort to loop one
    • Finish nutrition before T2

Run

Three loops through the city's bridges

  1. 0 km–14 km

    From Saval Park across the bridges

    Let a flat, fast bike's speed stay on the bike

    Leaving Saval Park on Isla Teja and crossing the Cau-Cau, Calle-Calle and Pedro de Valdivia bridges, the temptation is to carry bike speed into the run. Don't.

    • Shorten stride out of T2
    • Hold opening pace regardless of how fresh the legs feel

  2. 14 km–28 km

    First two loops of the Costanera

    Use the riverside loops as honest checks

    The repeated Costanera-to-Avenida-España loop, surrounded by crowds, gives a clear read on pacing. Compare each loop to the last rather than to how it feels in the moment.

    • Compare each loop's pace
    • Keep taking aid on schedule

  3. 28 km–42.2 km

    Final loop to the finish

    Spend what a disciplined, cold-water day left you

    The third and final loop is where a cold swim respected and a flat bike paced rather than raced pays off, finishing through Valdivia's crowds.

    • Decide the finish honestly
    • Run the last loop on effort, not memory of pace

04 Race week

What I would keep an eye on

There is no useful 2026 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
10.3–20.7°CDew point centred on 9.3°C
Wind and gusts
11.9 km/hGusts up to 44.3 km/hPrevailing direction WSW
Rain likelihood
Up to 75%Wet-surface uncertainty retained

Historical baseline, 2019–2025 · Open-Meteo historical archive · Updated 2026-09-18.Historical comparison only. This is not a forecast for 2026.

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 2026 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 Valdivia 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 the pacing discipline this course rewards.See the plans Personalised routeWork with me on the whole buildCoaching when you want the plan, feedback and race decisions joined up.See coaching

Further reading

ArticleFull-distance race strategy: calm execution beats chaosThe pacing discipline a fast, flat, two-loop bike course demands.ArticleFix the first ten minutes off the bikeUseful before a three-loop run that starts right after a fast, flat bike.

Evidence

Sources and verification

Course status: Partially verified. The organiser’s descriptions and latest published route profiles are in use. The final 2026 route is not yet confirmed. Last checked 18 Sept 2026.