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Brecon to Cardiff Ultra

Run 70km
Event details
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The Brecon to Cardiff Ultra is a 70k, one way, fully marked race that winds its way from Brecon following the River Taff. You will start in the Brecon Beacons National Park with its dramatic mountain landscapes, past crashing waterfalls and crystal clear reservoirs. As you head further south you will encounter a different landscape with reminders of Wales’s industrial heritage.

The race starts at 0800 from Brecon. Here you join the Taff Trail which you follow all the way to the finish. The trail makes much use of an abandoned branch of the Taff Vale Railway and the Glamorganshire Canal. These had been built in the 18th and 19th centuries to transport coal and iron ore from Merthyr Tydfil, the Cynon Valley and the Rhondda valley to the docks at Cardiff and Barry. These routes, which although disused had remained largely intact, provide a convenient path along the narrow Taff valley.
From Brecon, the route heads east following the Monmouthshire & Brecon Canal to Talybont-on-usk. Here the route climbs (not steeply – but for quite a long way) to Torpantu, from this point it is downhill all the way to the finish! Passing Pontsticill Reservoir and the Brecon Mountain Railway you arrive in Merthyr at with a great view of both the Cefn Coed Viaduct and Cyfarthfa Castle. Continuing south you will pass Aberfan and the memorial before reaching Pontypridd and finally the finish line at Nantgarw.
The first 30k of the route is almost exclusively on footpath or Forestry Trails. From Merthyr, the route follows an off-road cycle path all the way to the finish.
As the route is linear, there is the option of competitors parking at the finish and be transported, by coach, to the start in Brecon.

Review summary

16 Reviews
  • Course
  • Organisation
  • Atmosphere


Scott P
"Definitely change to road shoes at the kit stop. Dont require a full trail shoe..."


Paul A
"Great event, atmosphere and support from Marshalls, organisers and supporters...."


Dominic P
"Just when and where toilets are at PitStops. Kit recommendations is definitely..."
See all reviews

How to enter the Brecon to Cardiff Ultra

  1. Ultramarathon

    Run 70km
    Event passed

Brecon to Cardiff Ultra weather forecast

Light snow (< 1 in.) in the morning and afternoon.

Predicted highs
Predicted lows
IconHigh chance of snow
IconLight breeze possible, up to 6mph

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Brecon to Cardiff Ultra reviews (16)

4.5 out of 5 stars

  • Course
  • Organisation
  • Atmosphere
  • Did the Ultramarathon in 2018

    Definitely change to road shoes at the kit stop. Dont require a full trail shoe for the start. Better with less hard core. More road to trail shoe
  • Did the Ultramarathon in 2018

    Great event, atmosphere and support from Marshalls, organisers and supporters. My only small gripe was that on arrival st race start check in venue there was a queue to enter the sports hall meaning I was waiting in the cold for about 10 mins. I would suggest everyone is moved into the sports hall straight away as queue outside was caused by earlier arrivals registering causing a queue backlog to enter building. Sorry other suggestion is to notify runners in pre race package that course is suitable for trail or even road shoes with some tread. I carried studs in my rucksack for half the race before dumping them as they werent needed at all. I was a first time Newbury to Ultras so it was all a learning experience for me. I really thought it was a fantastic event which Ive recommended to friends and I would really like to do again next year. Thank you for organising and allowing me to have a fantastic experience
  • Did the Ultramarathon in 2018

    Just when and where toilets are at PitStops. Kit recommendations is definitely a Buff to help keep neck area warm and can be used too cover face during bad weather. Mine came in handy is probably one of major factors in myself finishing.
  • Did the Ultramarathon in 2018

    Just keep going...youll get there.If you were prepared to sign up, dont let a lack of training worry you. Your mentality will get you to the end. Trust me!
  • Did the Ultramarathon in 2018

    Consider putting road shoes in your drop bag; the second half of the course is more tarmac.
  • Did the Ultramarathon in 2018

    Definitely need water proofs. The weather can be challenging and 2018 was no different. Experienced all the seasons!! Trail shoes are a must for the first half so I was really glad of choosing them as I almost decided not to. Make sure you eat well during the race and don't rush as you will miss the beauty of the Brecons.
  • Did the Ultramarathon in 2018

    There are very few toilets along the route, be prepared!
  • Did the Ultramarathon in 2018

    Excellent race with gorgeous views along the way. Packing a second pair of shoes in the drop bag was useful - as was having some dry clothes to change into! Had snow and hail change to sunny weather and back all along - so come prepared!
  • Did the Ultramarathon in 2018

    I was alone for the last 10km on a lonely creepy bike path, felt a little uncomfortable. I would recommend either running with someone or arranging company from last feed to finish line.
  • Did the Ultramarathon in 2018

    The chance to change trainers at the Merthyr check point was a bit of advice that I had read that was very welcome.
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