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Race IntelligenceGalveston Island, United States

IRONMAN 70.3 Texas

Let the flat course reward a patient race.

Enter four numbers you already train with. You get a likely finish range, target paces and watts, and a plan for Texas's calm water, coastal roads and Moody Gardens run.

Race day
4 April 2027
Swim
1.9 km
Bike
90 km
Run
21.1 km

Published route evidence. Final 2027 route pending. Checked 14 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 Texas actually gives you

You swim in Galveston's calm water, ride a flat coastal bike course, then run through Moody Gardens. It is a course where discipline matters because nothing in the terrain forces you to back off.

Show distances in

Bike

90 km

Flat Coastal Roads

Setting
Galveston Island

Flat coastal roads reward a steady number. Speed is not a reason to spend more than planned.

Source: 2027 current organiser description

Run

21.1 km

Scenic Roads and Paths

Setting
Moody Gardens

The Moody Gardens run asks you to turn controlled bike pacing into patient running.

Source: 2027 current organiser description
Where these course facts come from

These facts come from the organiser’s latest published material: swim, 2027 current organiser description; bike, 2027 current organiser description; run, 2027 current organiser description. 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 into calm water

  1. 0–1900 m

    Swim

    Settle into rhythm

    Use the calm water to establish a sustainable effort early.

    • Seed honestly
    • Settle into rhythm

Bike

Ride the number, not the speed

  1. 0 km–90 km

    Coastal bike

    Ride the number, not the speed

    Keep your planned effort on the flat coastal roads. Let speed be an outcome, not the target.

    • Hold planned watts
    • Fuel consistently

Run

Make the flat run earned

  1. 0 km–21.1 km

    Moody Gardens run

    Make the run earned

    Start with control and progress only when your bike pacing has left you the room to do so.

    • Easy first aid station
    • Stay tall

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
16.9–24.4°CDew point centred on 17.9°C
Wind and gusts
23.6 km/hGusts up to 51.8 km/hPrevailing direction SE
Rain likelihood
Up to 85%Wet-surface uncertainty retained

Historical baseline, 2019–2025 · Open-Meteo historical archive · Updated 2026-09-14.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 70.3 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 70.3 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 Texas 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 routeHalf-distance training plansTraining plans for the durability this course asks for.See the plans Personalised routeWork with me on the whole buildCoaching when you want the plan and race decisions joined up.See coaching

Further reading

ArticleHow to pace a 70.3 so you can still runThe longer version of the pacing logic behind this Race Card.ArticleFix the first ten minutes off the bikeUseful when a fast bike needs to become controlled running.

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 2026-09-14.