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A wide view of Shasta Dam and the surrounding lake with mountains in the background.
Race Finder

IRONMAN 70.3 Northern California.
Your best day in Shasta Lake.

Whiskeytown Lake settles the race before 90 kilometres of Shasta County rollers hand you to the Sacramento River.

Redding area, Shasta Lake and dam.

Race day
23 May 2027
Course
Swim 1.9 km · Bike 90 km · Run 21.1 km
Historical air
14–32°C

What could you race?

I’m Tom, the coach behind Sense Endurance Coaching. Tell me where you are now and I’ll show you what a strong day in Shasta Lake could look like.

Let’s build your race

Let’s build your race.

Your age and race category help me estimate where that performance could place you. They don’t determine how fast I think you can race.

Change units

Northern California never asks you to hold one speed.

The bike rises and falls, and chasing the same number on the speed display is how the run gets expensive. Keep the effort smooth enough that the riverbank still feels runnable.

Whiskeytown Lake

Leave the lake with your breathing already under control.

Establish a sustainable rhythm in Whiskeytown Lake.

Seed honestly. Settle into rhythm.

Shasta County · rolling bike

Let every rise take speed before it takes extra watts.

Use planned effort through the rollers rather than chasing a constant speed.

Hold planned effort. Fuel consistently.

Sacramento River

Start the riverbank run as if the second half matters.

Start controlled and progress only when earned.

Easy first aid station. Stay tall.

What to check in race week

Check Whiskeytown water conditions and the final swim procedure, then review the latest bike map for any route changes. Use the forecast to set cooling and hydration choices, but keep the pacing plan based on effort rather than promised wind or temperature.

Forecast statusToo early for a forecast

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

Temperature
13.6–31.8°CDew point centred on 7.6°C
Wind and gusts
8.4 km/hGusts up to 42.5 km/hPrevailing direction NNW
Rain likelihood
Up to 75%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.

Make your finish prediction and I can send this plan to you in race week.

Build the legs.
Practise the decisions.

A finish range gives you something to work towards. The preparation is specific to this race: Practise riding rollers without power spikes, fuelling while the terrain keeps changing and beginning the run with patience. This is a race where smoothness on the bike buys options beside the river.

I’m Tom. With Sense Endurance Coaching, I’ll build that preparation around your life, follow how you respond and adjust the work as you get closer to Shasta Lake.

Explore coaching
Trisutto certified80/20 Endurance certifiedBrett Sutton’s Coach the Coach programme

Training on your own? See half distance plans

Course sourceOfficial course

PhotographyJonMallard10CC BY 4.0 · resized, cropped and monochrome