The Beast of the Beacons 10 Mile, 20 Mile, and 40 Mile races promise an exhilarating journey through some of Wales' most awe-inspiring landscapes within the Brecon Beacons National Park. These events cater to runners at all levels, from seasoned trail warriors to those new to the sport. The race begins in Llangynidr village hall, nestled deep inside the park's heartland, and takes participants on a journey that traverses forests, mountains, rivers, reservoirs, and mud-filled trails. As you run through this diverse terrain, expect panoramic views of rugged peaks and serene valleys that will inspire awe at every turn. Red kites soar overhead while an array of wildlife dots the landscape, making each step feel like an adventure in nature’s wild kingdom. The route is peppered with challenging ascents, rocky paths, soft forest trails, rivers to cross, muddy stretches, and occasional surprises – including snow patches that can persist even into spring. For those opting for the full 40-mile challenge, you'll get a second lap of the course in reverse direction, offering new perspectives on familiar scenery. Each distance comes with generous cut-off times: five hours for the 10-miler, eight hours for the 20-miler, and sixteen hours for the epic 40-mile run. A highlight for trail enthusiasts is that this event welcomes canicross runners—those who enjoy running alongside their dogs on a leash. Dogs must be at least one year old, fit to participate, and under strict control throughout the race. While owners are responsible for their pets both during the race and around headquarters, regrettably, no trophies will be awarded in this category due to the unique advantages canicross runners might experience. The Beast of the Beacons offers a blend of natural beauty and rugged terrain that challenges even the most experienced trail runner while providing an unforgettable adventure for all participants.
Races Offered
10 Mile Trail Running Challenge
Apr 17, 2027
straighten
Distance —
16.1K
terrain
Type —
Running
timer
286 days remaining
sell
£44.85
20 Mile Trail Running Challenge
Apr 17, 2027
straighten
Distance —
32.2K
terrain
Type —
Running
timer
286 days remaining
sell
£55.20
40 Mile Ultra Challenge
Apr 17, 2027
straighten
Distance —
64.4K
terrain
Type —
Running
timer
286 days remaining
sell
£75.04
Weather History
These values represent the 3-year monthly averages for April in Llangynidr.
thermostatTemperature
5.2° / 12.6°
wb_sunnyFeels like
1.7° / 8.8°
light_mode
Avg sunshine hours
7h 20m
water_drop
Avg rainfall
4.0 mm
ac_unit
Avg snowfall
0.1 cm
air
Avg wind speed
13.9 km/h (Gentle breeze)
opacity
Sweat loss rate
Low
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (3.5)
humidity_mid
Humidity
82.9%
wb_twilight
Sunrise
06:14
nightlight
Sunset
20:10
About Llangynidr
Learn more about the host city, Llangynidr.
Llangynidr is a village, community and electoral ward in Powys, Wales, about 4 miles (6.4 km) west of Crickhowell and 9 miles (14.5 km) south-east of Brecon. The River Usk flows through the village as does the Monmouthshire and Brecon Canal. It is in the historic county of Brecknockshire.