Brechfa Trail Races.
The half marathon at the Brechfa Trail Races is a single lap of forestry tracks through Glyn Cothi forest in Wales, with around 500 metres of climbing. Two places define it: the long climb right at the beginning and the ramp just before the finish, which takes back what the opening downhill gave you. Your preparation has to aim at both.
Brechfa Trail Races 2027: Course, Elevation & Route Profile
The lap opens downhill, dropping almost 40 metres in the first kilometre before a short flat stretch. At kilometre 2 the longest climb of the day begins: a little over three and a half kilometres at around five percent on average, lifting you from about 150 to more than 330 metres. Between kilometres 5 and 10 you stay up there, and the course only undulates gently.
The second half is more restless. From kilometre 10 the route loses over 100 metres in two kilometres, and just before kilometre 14 comes the second real climb: one kilometre at nearly eight percent, which carries on more gently to kilometre 15.5. From there it heads down, interrupted by a short steep kick at kilometre 17.5, to the lowest point of the lap at kilometre 19. The last ramp, about 650 metres at just over seven percent, sits right before the finish.
The event is based at Keepers Car Park in Brechfa Forest. The lap follows a Natural Resources Wales trail past quiet pine stands, deciduous woods, waterfalls and open panoramic views. It is fully marked and easier going than the technical sections of Ridge Runners' longer races. Marshals, medical support and aid stations with water and snacks are out on course, and you will have company: the marathon runners set off an hour ahead of you on the same lap, which they cover twice.
| Start | Length | Ø | Max. | Gain | Cat. |
|---|---|---|---|---|---|
| km 1.9 | 3.7 km | 5.4 % | 14.1 % | +200 m | Cat. 3 |
| km 8 | 0.4 km | 3.4 % | 4.2 % | +13 m | — |
| km 13.7 | 1 km | 7.7 % | 13.3 % | +79 m | — |
| km 17.6 | 0.4 km | 6.9 % | 13.9 % | +28 m | — |
| km 19.6 | 0.7 km | 7.2 % | 18.6 % | +47 m | — |
Climb categories follow the road-cycling convention and rate the terrain itself (length and gradient) regardless of sport: Cat. 4 marks the easiest rated climbs, Cat. 1 the hardest, and HC (hors catégorie, “beyond categorization”) is reserved for the most brutal ascents. Short climbs below the Cat. 4 threshold stay unrated.
How to pace Brechfa Trail Races.
Start under control
Let the opening downhill roll without trying to bank time from it, because from kilometre 2 only your climbing counts. On the first climb pick an effort you can hold for the whole three and a half kilometres, and take a short walk on the steepest pitches rather than overreach. Your best pace belongs on the forestry tracks up high, through kilometre 10: the ground carries you there, and you gain more time than on any ramp.
Hold your rhythm
The race is decided between kilometres 14 and 16. This climb arrives after the long descent has already worked your quads, and it is steeper than the first. If you can still run it smoothly, you will be passing people all the way home.
Spend what is left
The trap comes straight after. The downhill to kilometre 19 invites you to let go, yet the closing ramp is right behind it, and on battered legs it turns into a walk. Hold a little back on that last descent. Do not get pulled along by marathon runners you meet out there either: their sums are different from yours.
Training plan for Brechfa Trail Races: 12-week build
Build the base
Age-group runners are out for roughly 2:15 to 3:15 hours. A little over 40 percent of the distance climbs and slightly more descends, so this is no steady tempo run: long aerobic stretches alternate with climbs that push you past comfortable, and only the section between kilometres 5 and 10 allows a settled rhythm.
Train race pace
Two demands decide your day. Early on you need climbing endurance for an ascent of 20 minutes or more; late on you need the strength to climb steeply again after a lot of downhill running. The second is the rarer ability, and it is what the closing phase from kilometre 14 tests.
Rehearse the course
So make your long runs hilly and put the climbing deliberately in their second half. A strong key session for the final weeks is a long run that ends with a brisk downhill, followed by a few repeats on a short steep slope. Add hill intervals of three to five minutes for the long climb. Quad strength work and regular downhill running prepare your legs for the switch between the two.
Arrive fresh
A mid-March date puts your longest runs in January and February, so schedule them early. Spend as much time as you can on forestry tracks, since that pace on that surface carries your race and technical trail practice matters little here. Use the long runs to test what you can eat on the move: the aid stations offer water and snacks.
Courses
Download the Brechfa Trail Races course as a GPX file for your watch or bike computer.
Let YOUB adapt your plan for Brechfa Trail Races dynamically
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Everything about Brechfa Trail Races.
How long is Brechfa Trail Races?
Brechfa Trail Races is 21.1 km long. That distance shapes how much aerobic endurance, pace durability, and race-specific work belong in the training plan.
How much elevation gain does Brechfa Trail Races have?
Brechfa Trail Races has around 500 m of elevation gain over 21.1 km. That affects pacing, muscular load, and preparation for late-race sections.
What is the route profile of Brechfa Trail Races?
Brechfa Trail Races is classified as Hilly, averaging 24.6 vertical metres per kilometre. 16% of the route is flat, 29% climbs moderately (2 to 6%) and 11% is steeper than 6%.
What climbs does Brechfa Trail Races have?
The hardest climb of Brechfa Trail Races starts at kilometre 1.9, runs for 3.7 km at an average of 5.4% and gains 200 metres. Cycling-convention rating: Cat. 3. 5 climbs are mapped in total.
Is Brechfa Trail Races a loop course?
Yes, Brechfa Trail Races is laid out as a loop: start and finish are in the same place.
Is there a GPX file for the Brechfa Trail Races course?
Yes. The Brechfa Trail Races course is on this page as a free GPX download — ready to import into Garmin, Wahoo, Komoot, Strava or any other app that reads GPX.
How should I prepare for Brechfa Trail Races?
Preparation for Brechfa Trail Races should account for 21.1 km, 500 m of elevation gain, current training load, and available training time. An adaptive plan helps place key sessions without ignoring recovery and real life.
What pacing strategy works for Brechfa Trail Races?
The pacing strategy for Brechfa Trail Races should reflect 21.1 km, 500 m of elevation gain, and your current fitness. Start controlled and keep margin for sections where the profile or fatigue makes target pace harder.
When does Brechfa Trail Races take place?
Brechfa Trail Races takes place on March 13, 2027.
Where does Brechfa Trail Races take place?
Brechfa Trail Races takes place in Brechfa, United Kingdom.
Which distances does Brechfa Trail Races offer?
Brechfa Trail Races offers 2 distances — Half Marathon: 21.1 km; Marathon: 42.2 km.
How do I register for Brechfa Trail Races?
Registration runs through the organiser: ridgerunners.co.uk. YOUB shows you the course, elevation profile and training plan for your preparation.
