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Race IntelligenceSacramento, California, United States

IRONMAN California

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
18 October 2026
Swim
3.8 km
Bike
180.2 km
Run
42.2 km

Published route evidence. Final 2026 route pending. Checked 17 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 California actually gives you

You swim point to point down the American River into the Sacramento River, exiting near Tower Bridge, then ride two flat loops through delta farm and wine country, then run two flat loops on the River Walk Trail and through Old Sacramento to finish on Capitol Mall. The organiser sells this as a personal-best course and it genuinely is one. The two things that decide your day are the cold water at the start and whether you can leave the bike alone on a course that never asks you to.

Show distances in

Swim

3.8 km

Downriver, Point to Point

Layout
Point to point, no loops
Setting
the American River near Township 9 Park, into the Sacramento River, exiting near Tower Bridge

A point-to-point downriver swim in water the organiser puts at around 17 degrees, so the cold matters more here than the distance does.

Source: 2026 current route

Bike

180.2 km

Flat Farmland, Two Loops

Layout
2 loops
Setting
the Sacramento River delta and Central Valley farm and wine country

Two flat loops through delta farmland, where there is no terrain to check an effort that is slightly too high.

Source: 2026 current route

Run

42.2 km

Flat Riverside Trail and City Streets, Two Loops

Layout
2 loops
Setting
the River Walk Trail, Old Sacramento and Capitol Mall

Two flat loops on riverside trail and city streets, finishing at the State Capitol, with nothing in the profile to hide a pacing error behind.

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 first, fast second

  1. 0–3800 m

    Downriver to Tower Bridge

    Get your breathing under control before you race

    The organiser puts average water temperature around 17 degrees, cold enough that the first minutes can feel like you cannot breathe properly. The current is helping you, so there is no reason to fight. Settle, then swim.

    • Expect the first two minutes to feel bad
    • Let the current do the work

Bike

Two flat loops, one number

  1. 0 km–45 km

    Out into the delta

    Pick your ceiling before the loop repeats

    Flat farmland with nothing to interrupt you. This is where a number that is 10 watts too high feels completely sustainable, and where that decision is actually made.

    • Cap power in the first 30 minutes
    • Start fuelling early

  2. 45 km–90 km

    Closing loop one

    Finish lap one the way you mean to ride lap two

    The delta is open enough that wind, not gradient, is the variable. Hold power rather than speed if it picks up, and close the first loop at the effort you intend to repeat.

    • Ride the wind on power
    • Stay on the fuelling schedule

  3. 90 km–180.2 km

    Lap two

    Match lap two to lap one exactly

    This is the honest half. A flat second lap at the same power is what leaves a flat marathon intact, and riding it faster is the single most common way this race is lost.

    • Compare lap two power to lap one
    • Finish nutrition before T2

Run

A flat marathon hides nothing

  1. 0 km–10.55 km

    South on the River Walk Trail

    Start slower than a flat course invites

    The run opens along the Sacramento River on flat trail. There is no climb anywhere to force a correction, so the correction has to be a decision you make in the first kilometre.

    • Hold opening pace for 5 km
    • Shorten stride out of T2

  2. 10.55 km–21.1 km

    North under the bridges

    Use the bridges as your checkpoints

    The loop passes under Tower Bridge and I Street Bridge and out toward Discovery Park. Fixed landmarks on a flat course are the most useful pacing check you have here.

    • Check pace at each bridge
    • Take aid on schedule

  3. 21.1 km–31.65 km

    Lap two begins

    The second lap tells the truth about the bike

    Repeating the same flat loop gives a clean read. If lap two is already slipping, the bike was ridden too hard, and the job now is managing the fade rather than fighting it.

    • Compare lap two to lap one
    • Adjust deliberately

  4. 31.65 km–42.2 km

    Old Sacramento to Capitol Mall

    Spend what an honest bike left you

    The finish runs through Old Sacramento along Front Street and up Capitol Mall to the State Capitol. On a course this flat, whatever you held back on the bike is still available here.

    • Decide the finish honestly
    • Run the last kilometres on effort

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
12.5–27.6°CDew point centred on 7.7°C
Wind and gusts
7.2 km/hGusts up to 32.8 km/hPrevailing direction WSW
Rain likelihood
Up to 60%Wet-surface uncertainty retained

Historical baseline, 2019–2025 · Open-Meteo historical archive · Updated 2026-09-17.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 California 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 flat, two-loop course demands.ArticleFix the first ten minutes off the bikeUseful before a flat two-loop marathon that starts right after a fast 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 2026-09-17.