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Triathlon Atlas

Half distance · 24 July 2027

IRONMAN 70.3 Boise

Boise, United States

The race at a glance

Official race website
Circuit
IRONMAN
Distance
Middle distance
Terrain
Road
Swim
1.9 km
Bike
90 km
Run
21.1 km
Date
24 Jul 2027
Registration
Open
Swim venue
Reservoir
Average water temperature
19 °C
Bike profile
Hilly
Bike elevation gain
505 m
Run profile
Flat
Run elevation gain
56 m
High air temperature
38 °C
Low air temperature
21 °C
Overall cut-off
8 h 30 min
Entry fee, from
$420
Altitude
938 m
First edition
2008
Swim start
Rolling start

Edition history

202625 Jul 2026Held
202526 Jul 2025Held

How the day is laid out

The swim is held in a reservoir. The wetsuit call is made on race morning, against the temperature measured then.

The bike leg is labelled hilly and runs over 2 loops.

The run is labelled flat.

A hilly bike ahead of a flat run puts the day's decision early: what you spend on the climbs is what the run will not have.

Expect air between 21 °C and 38 °C on race day. A spread of 17 degrees across the day matters as much as the peak, because what you wear at the swim exit is rarely what you want at the far end of the bike.

Against the calendar

Where this race sits among the others

Ranks are computed across every race of the same distance.

  • Average water temperature

    19 °C · median 21 °C

    The 30th coldest of the 128 middle-distance races with a figure, across every circuit.

  • High air temperature

    38 °C · median 25 °C

    The hottest of the 152 middle-distance races with a figure, across every circuit.

  • Bike elevation gain

    505 m · median 569 m

    The 44th flattest of the 105 middle-distance races with a figure, across every circuit.

11

races of this distance pair a hilly bike with a flat run, out of 159. 29 share the bike profile alone.

37

races across every distance fall in July, out of 354.

68

races are held in North America. 12 of them in the same month as this one.

Questions about this race

When is IRONMAN 70.3 Boise 2027?
IRONMAN 70.3 Boise is held on 24 July 2027 in Boise, United States. Registration is open on the official race page.
Is a wetsuit allowed at IRONMAN 70.3 Boise?
Most likely. The average water temperature is 19 °C, below the 24.5 °C limit up to which wetsuits are allowed for age-group athletes. The official call is made on race morning.
What is the cut-off at IRONMAN 70.3 Boise?
The course closes 8 h 30 min after the start. Intermediate cut-offs after the swim and the bike are in the athlete guide.
How hard is IRONMAN 70.3 Boise?
The bike course climbs about 505 m, the 44th flattest of 105 half-distance races with a figure. The bike is labelled hilly and the run flat. Expect highs of about 38 °C on race day.
How much is the entry fee for IRONMAN 70.3 Boise?
Entries start at US$420 for an individual age-group entry, before service fees. Prices rise by tier as the race fills.

Where to stay

Hotels and rentals around the race venue, for the nights around race day.

Suggested stay: 22 Jul 2027 to 25 Jul 2027

The map is provided by Stay22. Bookings are made with the provider.

Races of the same distance in the same region

Entries are handled by the organiser

Registration and the athlete guide are on the official race page.

Open the official race page