Race Day at Boise 70.3: Timeline, Common Mistakes, and Backup Plans

Two Days Out: Course Recon and Headspace

If you arrive with time to spare, use it well. Go check out Julia Davis Park and the Greenbelt: knowing where you'll run the 2 laps removes unknowns. If you can, drive up to Lucky Peak Reservoir to see the start area and the descent off the dam, which is steep and fast: seeing it beforehand helps you descend with good judgment on race day.

Check the weather and air quality: in late July, dry heat is almost guaranteed (reported average highs are very high; in 2025 it hit 34 °C on the run) and wildfire smoke is possible in the Mountain West. You can't control it, but you can adjust your expectations.

The Day Before: Your Bags Decide Your Morning

This is the logistics day: drop off your bike gear bag for T1 and your run gear bag for T2, plus check-in per the official procedures. Written checklist, photo of each bag's contents before closing it, then stop thinking about it.

Classic mistake: leaving something in a bag "to decide in the morning." With a split transition, there is no morning. Decide everything today: bike nutrition, sunglasses, socks or no socks.

Early dinner, steady hydration throughout the day (dry heat: you start paying for it before you notice), alarm set with a buffer.

Race Morning: Shuttle, Not Car

Non-negotiable: there is no parking at Lucky Peak State Park on race morning. You get there by shuttle. Work backwards from the start time with a generous buffer: shuttle line, the ride itself, porta-potty queue, getting your wetsuit on. Arriving early costs you half an hour of sleep; arriving late costs you the race.

At the start, hand your morning clothes bag to the volunteers near the start line. Then look at the water: in 2025 it was 19.6 °C (wetsuit legal), but morning wind had churned up the return stretch, with waves and buoys drifting. If you see chop, update your plan: bilateral breathing, more frequent sighting with high sight lines on the buoys, and mouth closed in the waves — several race reports mention GI issues among athletes who swallowed water. The swim is reported as physical: seed yourself at the start based on your actual level, not your hoped-for one.

During the Race: The Three Most Expensive Mistakes

1. Pushing on the closed-road sections: over 30 miles of fully closed roads tempt you to go above your watts. The bill comes due on the run with the thermometer at 32-34 °C. 2. Being unprepared for left-side aid stations: the first and last bike aid stations have left-hand grabs. Knowing this in advance keeps you from missing fluids you need. 3. Going out too fast on the first run lap: the course is pancake flat (24 m of gain) and you feel great early on. First lap conservative, ice and water at every aid station, then push on the second if your body responds.

Backup Plans to Have Ready

• Strong wind on the swim: an alternate breathing and sighting plan you've already trained; forget about speed, focus only on staying on course.
• Gusts on the descents (the dam and Pleasant Valley Road): get out of aero, hands on the brakes, compact on the bike. The seconds lost there won't decide your race; a crash will.
• Heat hotter than expected: switch from your "time" plan to your "finish" plan: cut the pace, use every aid station to the fullest, ice everywhere.
• GI issues after the swim: on the bike, start with plain fluids in small doses, and resume your full nutrition plan only once your stomach has settled.

The Finish

You finish in downtown Boise after the 2 laps on the Greenbelt. Bike and bag pickup follows the organizer's procedures: times and details aren't in the sources gathered, so check the athlete guide. Plan this out before you leave too: once the race is over, all you'll want is to sit in the shade.