THE SYDNEY TRAIL MARATHON 21

On Monday October 6th 2025 (Oct Long Weekend), get ready for the Sydney Trail Marathon 21, presented by 180 Cadence

The race takes place in Bidjigal Reserve, a rare island of natural beauty in the heart of Sydney. Alive with noise, colour, and movement, this rugged sanctuary is rich with hidden treasures waiting to be explored.

STM 21 is a single-lap course that takes runners beneath towering eucalypt canopies where the sunlight filters through the leaves, streams flow gently alongside the trails, and creeks sparkle in the morning light.

RACE DETAILS

DISTANCE: 21 KM

ELEVATION: +377 m / -377 m

START TIME: 7:00 am

START LOCATION: Eric Mobbs Reserve

RACE DATE: Monday, 6th of October 2025

Everything from the organisation, communication, course marking, vibe, medals, photos and trails was amazing. Thank you! - Michaela, 2024 Runner

PRICING

EARLY
$130 AUD

STANDARD
$135 AUD

FINAL SPOTS
$140 AUD

THE STM 21 IS LIMITED TO 200 RUNNERS

THE COURSE

WHAT YOU GET AT THE

SYDNEY TRAIL MARATHON 21

Premium Event Shirt

Free Race Photos

Finishers medal

Aid Stations

And everything else you expect from a world-class event.

MANDATORY GEAR

The Sydney Trail Marathon 21km course traverses trails where it might take some time for medical and support services to reach you, therefore it is essential that every athlete carry their mandatory gear at all times.

STM is also a cupless event. Athletes are required to carry their own drinking cup, bottle, flask or hydration vest which can be used at the aid stations.

MANDATORY GEAR LIST

  • Must be fully charged with a live SIM card capable of making calls and accessing the internet.

  • The bandage is required as you might need to use it treat sprains or potential snake bites. We recommend this snake bandage from Amazon.

  • This can be in the form of 1 × 500ml running flasks, a bladder or normal water bottles.

    Please note that STM is a cupless event.

FAQ

  • The 21km course takes runners through the stunning landscapes of Bidjigal Reserve which are among the best trails in the world

    You can find a link to the course on Strava here.

    You can find a link to the course on Garmin here. 

  • You will pass an aid station two times in the STM 21. Aid stations can be found at the following KM marks: 9, 15

  • All participants are required to carry the full list of mandatory gear from start to finish throughout the race. Random gear checks will be conducted before letting you into the starting corral. Failure to carry all mandatory gear during the race will result in disqualification

  • Runners will be able to park at Eric Mobbs Reserve which is next to the startline.

    Parking is free for the entirety of the event. There will be no need for additional shuttle buses or to purchase a parking pass

  • The race starts at 7:00am on Monday the 6th of October 2025 (long weekend). The race will start at Eric Mobbs Reserve in Castle Hill, Sydney

  • There is a 4 hour cut off to finish the STM 21. All runners must reach the finish by 11:00 am in the morning

    The pace you need to average to finish in 4 hours is 11:25 min/km 

  • There will be a bag drop available at the start and finish line

  • You will be able to collect your bib pre race and on race day morning. Details will be sent out closer to the event

  • The STM 42 is limited to 200 runners