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Fri, Jul 21


Idaho Falls

Operation CENTURY

100+ miles. 48 hours. It's the ultimate challenge...

Registration is Closed
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Operation CENTURY

Time & Location

Jul 21, 4:00 PM – Jul 23, 6:00 PM

Idaho Falls, Forest Trail 122, Irwin, ID 83428, USA

About the Event

Operation CENTURY

Distance: 105 +/- miles

Event Start Time: Friday 21st July 2023 at 1600hrs

Start Location: North Indian Creek Trail Trailhead, ID

Event Finish Time: Sunday 23rd July 2023 at 1800hrs

Finish Location: North Indian Creek Trail Trailhead, ID

WARNING: This event is very challenging. It is our longest distance single event at over 100 miles.


Operation CENTURY is a 100+ mile event consisting of 5 laps of a 21 +/- mile course. The route starts in Idaho and takes you over the border into Wyoming before returning you to Idaho. Operation CENTURY is our longest single event and is a real test of endurance and fitness at altitude and mental strength.


Candidates must complete the 105 +/- mile route in under 48 hours to pass and earn the GBF Operation CENTURY Dog Tag.


Candidates will meet at the North Indian Creek Trail Trailhead parking area on Friday 21st July. After 1600hrs, GBF Staff will give an event brief before checking candidates' kits. Candidates are advised to carry paper maps (waterproofed), in addition to their smartphone, for navigation. Once GBF Staff are happy with the candidate's kit, they will be released to begin the route.

Candidates must complete FIVE loops, including Observation Point, to finish the 100+ mile event.

Candidates finishing in under 48 hours will receive the highly sought-after 'GBF Operation CENTURY’ dog tags. The first candidate (or pair) to complete the course will receive a GBF Gold Dog Tag.

IMPORTANT. Each loop must be completed in under 10 hours to progress onto the next loop. Candidates NOT expected to finish in under 48 hours will be withdrawn when it is evident they are going to go over time.

Service Support

- Mapping. You can navigate this route easily from the AllTrails app on your Smartphone. GBF suggests candidates have a paper map, compass, and GPS too. To download the route from AllTrails, you will need to sign up for a membership.

- Route. Operation CENTURY. This 21 +/- mile loop is gradual and consists of a loop and a branch off to Observation Peak (9,964 ft) on every loop. The final 2 miles is on a track/dirt road.

- Dress. Candidates' dress will be a personal choice but they are reminded this is a rural event with no vehicle support. Wet weather and cold weather gear is mandatory in case of inclement weather conditions.

- Equipment.

This list is mandatory. You will NOT be allowed to start if an item is missing. (Items linked are for guidance only)

This list is strongly recommended:

- Replen. This is a self-sufficient route until you return to the start / finish point. There will be water and bananas and energy drinks at the start / finish. Depending on recent rainfall, there may be streams with the possibility to filter water with the LifeStraw.

- Rations. Candidates must have a minimum of 4 x energy bars as emergency rations on each loop. It is the candidates' own decision if they wish to take extra food with them.

- Water. Candidates should carry enough water to last 25 +/- miles in case they get lost. There will also be water at the end. Candidates must start the event with a minimum of 4 litres of water or they will not be allowed to start.

- Medical. A personal medical kit is required by every candidate. GBF Staff must be made aware of any medical conditions prior to starting the event. If any GBF staff deems a candidate is medically unfit to continue, they may be withdrawn from the event for their own safety.

- Transport. Transport to and from the event will be at candidates own arrangement.

Command and Signal

GBF HQ - 9419939432

Weight - Candidate’s backpacks must weigh a minimum of 25 lbs at the start of each loop, including all the mandatory gear and water and food.

Numbers - Maximum number of candidates 40. Minimum number of candidates 10.


Until 1st May $245

Until 1st June $255

Until 1st July $265

Until Event Day $275

Refunds - Refunds will be in the form of a GBF voucher for future events. Refunds within 30 days of an event will not be possible.





  • Operation CENTURY


    +$17.15 Tax


    +$17.15 Tax





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