Katoomba, Australia · Blot

Is Australia's UTA100 the right first 100K mountain trail race?

Ultra-Trail Australia’s UTA100 starts in Katoomba on May 15, 2027. The course covers 101km with 4,400m of elevation gain and a time limit 28-hour cutoff. Entry is first-come, first-served rather than lottery-based, and opened at 11 a.m. on September 17, 2026.

101km. 4,400m of elevation gain.

Time limit 28 hours. Then 951 steps at the end.

The first three numbers make UTA100 sound manageable. Twenty-eight hours is not a tight cutoff for a 100km trail race.

But open the organizer’s published cut-off point table and the word time limit never appears. What appears instead are times: Tarros, 13.8km, 12:30 p.

m.; Pidgeon Nob, 23.8km, 2:30 p.

m.; Six Foot Track, 37.3km, 5:20 p.

m. The clock does not stop at start line.

On May 15, 2027, the race starts in Katoomba, in the Blue Mountains World Heritage Area. Entries are already open.

Katoomba, Australia

1A 101km course with 4,400m of elevation gain

From Scenic World, runners first climb to Narrow Neck. Wide trails alternate with singletrack before the route passes Ironpot Ridge and enters Leura Forest. After Wentworth Falls, it descends Kedumba Pass, then climbs the 951 Furber Steps before returning to the starting point.

Scenic World serves as both start and finish. The 101km course includes 4,400m of elevation gain. That is a different scale from calling a road marathon hilly because it gains 100m.

Averaged across the course, it amounts to 43m of climbing every kilometer, and the ascent is not spread evenly across course. The phrase “Blue Mountains World Heritage Area” describes more than the scenery; it signals repeated climbs and descents between cliffs and valleys.

Ultra-Trail Australia: UTA50 & UTA100Sat, May 15, 2027 · D-183 · Katoomba, AustraliaSee race details

Katoomba, Australia

2Checkpoint cut-offs tighten in the later stages

The organizer’s cut-off point table lists the following: Tarros, 13.8km, 12:30 p.m.; Pidgeon Nob, 23.8km, 2:30 p.

m.; Six Foot Track outbound, 37.3km, 5:20 p.m.

; Katoomba Aquatic Centre, 56.2km, 10:20 p.m.; Queen Victoria Hospital, 79.3km, 5:05 a.

m. Sunday; finish, 101.3km, 12:30 p.m.

Sunday. For a runner starting at 5 a.m.

, those checkpoints translate to 7 hours 30 minutes, 9 hours 30 minutes, 12 hours 20 minutes, 17 hours 20 minutes and 24 hours 5 minutes. The required average pace rises from 1.8km per hour to Tarros to 3.3km per hour by the mark at 79.3km. The front end is loose; the back end is tight.

Time gained early becomes the only margin later, so a strategy built around conserving effort in the first half does not work well here.

Katoomba, Australia

328-hour limit, with the finish line closing at 12:30 p.m. Sunday

Time limit The 28-hour limit starts from each runner’s individual start time. Start groups are assigned by ability, so the entire field does not set off together at 5 a.m.

The finish cut-off point, however, is fixed at 12:30 p.m. on Sunday.

That is where the two rules collide, and where the calculation changes for later groups. A 5 a.m.

start gives 28 hours until 9 a.m. Sunday, leaving 3 hours 30 minutes before the finish cut-off point.

The later the start, the smaller that margin becomes. Until the start time for bib is confirmed, the 28-hour limit is not a runner’s own clock.

Katoomba, Australia

4Mandatory gear: insulating top, waterproof jacket and headlamp

The long-sleeved thermal top must be polypropylene or wool. The waterproof jacket must have taped seams and a hood. One of a beanie, balaclava or Buff is required.

UTA100 adds long thermal pants, thermal gloves that cover the fingers and a spare light. If cold or rain is expected, waterproof overtrousers and synthetic fleece weighing 100 or more are added to the list. The organizers do not provide a temperature forecast in the regulations.

The kit list does that work. It makes clear that this is a mid-May mountain race that runs through the night, while the rule that additional equipment is confirmed only on the day before the race—and announced at check-in, the briefing and through the race app—fills in the rest. The remaining items are safety equipment: a high-visibility vest meeting Australian and New Zealand standard AS/NZS 4602; a phone with a charged battery and an activated SIM; a whistle; a compression bandage 7.5cm wide and 2.3m long; a 2-liter water bottle or bladder; 2 food items; a headlamp; a waterproof bag; and an emergency thermal blanket.

Missing even one of these means no start at start line.

Katoomba, Australia

5Fail the kit check and you get no bib

UTA100 runners must pass an equipment inspection before receiving their race pack. The rule is brief: no mandatory equipment, no start. There are two ways to complete the inspection.

It can be done before race week at a designated partner store in NSW, ACT, VIC, QLD, SA, WA or TAS, or at on-site check-in. Completing it in advance shortens the wait at the venue. If an item is missing, the race pack is withheld until it is produced—and nobody wants to spend the night before the race searching Katoomba for a waterproof jacket.

Random inspections also take place during course. If equipment is missing, the runner cannot continue until it is replaced and receives a time penalty. Cutting one item to reduce pack weight is a decision that costs the most on the 79.3km mark.

Katoomba, Australia

6Registration opens September 17 on a first-come, first-served basis and closes when capacity is reached

Many 100km races filter entrants through a lottery or qualifying performances. Ultra-Trail Australia does neither. General entry for the 2027 race opens at 11 a.

m. (AEST) on September 17, 2026, and remains open until the field is full. Before that, a limited number of priority entries for runners with a UTMB Index opened on September 15 at 11 a.

m. for 48 hours. The only race requiring a qualifying performance is the 100-mile event.

UTAMiler entrants must have an officially recorded finish of 50km or more between March 28, 2025 and March 28, 2027. Submissions close at 11:59 p.m.

(AEST) on March 28, 2027. UTA100 and UTA50 have no such requirement. In these races, the filtering does not happen at registration.

It happens during preparation.

Katoomba, Australia

7Entry fee: AUD 620; refunds available only through April 4

Entry fee entry fees include the service fee and GST: 1,170 Australian dollars for UTAMiler, 620 Australian dollars for UTA100, 420 Australian dollars for UTA50, 260 Australian dollars for UTA22 and 160 Australian dollars for UTA11. The refund policy steps down in stages. Cancel by February 21, 2027, and 45% is refunded.

By April 4, the refund is 22%. After that, nothing. April 4 is 41 days before race day.

Transfers remain available until 5 p.m. (AEST) on May 13, 2027, with a 55 Australian dollar transfer fee.

Deferrals to the following year are not available. The only exception is the pregnancy and childbirth policy, which allows a full refund or a deferral of up to 2 years. That makes April 4, 2027, the day when the real decision is made—not the day of registration.

The question is whether training is on track by then. If it is not, taking the 22% refund and stepping away is the calculation that makes sense.

Katoomba, Australia

8UTA50 — 51km, 14-hour 30-minute cut-off

UTA50 covers 51km with 2,400m of elevation gain and a time limit cutoff of 14 hours 30 minutes. Runners set out at 5:05 a.m.

, pass Fairmont Resort at 18.4km, Queen Victoria Hospital at 29.3km and the emergency aid station at 42.6km, then finish at the same finish. The course also includes the 951 steps of Furber Steps. The average pace required to finish is 3.4km/h.

That may look like walking speed, but it must be maintained for 14 hours 30 minutes while climbing 2,400m. The finish earns six Running Stones in UTA100 and four in UTA50. Runners who finish UTA100 within 19 hours also qualify to enter the Western States 100 lottery.

Editor's pick

For a first 100km attempt, UTA50, not UTA100, is the race to pick. The reason is time limit, not the distance. UTA50 has a 14-hour-30-minute cutoff, and with a 5:05 a.

m. start, most runners pass finish before dark. UTA100 is designed to take runners through one night.

That is why a headlamp and backup lighting are mandatory equipment. For runners who have already completed 100km and are considering Western States, UTA100 is the relevant race. The 19-hour line is clearly marked, more than 12 hours ahead of the final cut-off point on the cut-off point table.

Set the goal at 19 hours rather than simply finishing, and the training changes accordingly. For a 100-mile entry, the first thing to check is not entry fee but March 28, 2027. The deadline for submitting a qualifying result is that day; without one, the application is not valid.

Entries are open and remain open until the field fills. The date to mark first is not the day of registration but April 4, 2027.

After that date, no money will be refunded, leaving only the trip to Katoomba.