Aberdyfi, United Kingdom · Saturday, August 15, 2026

Fixed Distance 50 mi

Run to the Castle Ultra

Race completed

68 km Distance

not publishedn/a Climbing

3.4 est Grit · Challenging

Calculated from 68 km alone — the organiser has not published an elevation profile. Read 3.4 as a floor, not a verdict.

52.5451° N, 4.0534° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 12 hours 10:35 min/km average. Firm. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. About average for a 50 mi. Measured against 477 races of the same distance. Cut-off calculator →

Field size ~25 Small. Long stretches with nobody in sight.

DUV results for the 2023 edition (42mi) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, August

Daytime high 18°C

Night low 11°C

Rainfall Showers likely

Daylight 14 h 48 m of light

Regional 2001-2020 average for August — NASA POWER, grid elevation 255 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2023	42mi	25	Sam Chilvers · 06:40:12	Sarah Denton · 08:17:03
2023	42mi	18	Julian Ayres · 06:42:22	Sonia Williams · 07:25:32
2022	40mi	13	Toby Hellman · 08:53:45	Sarah Denton · 09:15:53
2022	40mi	39	Charles Allington · 07:04:50	Freya Bevan · 08:34:46
2021	40mi	19	Ryan Williams · 07:11:23	Nerys Jones · 07:07:26
2020	40mi	17	Sean Rice · 06:35:39	Ute Baird · 08:48:40
2019	40mi	34	Dylan Moxon · 06:31:35	Charlotte (Charlie) Beddow · 07:13:05
2019	40mi	43	Tom Randall · 06:24:56	Sarah Morwood · 06:53:16
2018	40mi	39	Richard Taylor · 06:06:35	Susie Chesher · 06:06:35
2018	40mi	39	Julian Ayres · 06:50:05	Lucy Tolley · 08:34:26

28% of the 2023 field were women.

DUV results for the 2023 edition (42mi) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Course notes

gear With trail terrain, choose a shoe with moderate cushioning for optimal performance.

Gear for this race

Chosen for 68 km of trail.

Trail Running Shoes 68 km of trail — cushioning that is still there in the last quarter.
Race Nutrition 68 km of self-supported fuelling between aid stations.
Hydration Vests Flask capacity for 68 km, without the bounce.
Headlamps A 12 h limit puts you out there after dark.
GPS Watches Battery life first — a 68 km day outlasts most full-GPS modes.

Adidas

Terrex Agravic Speed Ultra

RunRepeat found the Adidas Terrex Agravic Speed Ultra to be perfect for midfoot and forefoot strikers, while iRunFar noted that the shoe feels incredibly effici…

★★★★★ 4.5

New Balance

Fuel Cell Super Comp Trail

★★★★★ 4.5

Spring Energy

Awesome Sauce

Real food gel with 180 calories. Rice-based with natural flavors.

$4 ★★★★★ 4.6

Salomon

ADV Skin 12

Industry-standard 12L race vest with front flask pockets and minimal bounce.

$180 ★★★★★ 4.8

Petzl

NAO RL

1500-lumen reactive lighting headlamp with 15-hour runtime. Automatic brightness adjustment.

$150 ★★★★★ 4.7

COROS

APEX 2 Pro

GPS running watch with 75-hour GPS battery, topo maps, and training metrics.

$500 ★★★★★ 4.7

All gear guides →

Overview

Run to the Castle Ultra was a 68-kilometer coastal trail race in Aberdyfi, United Kingdom, organized by How Hard Can It Be Events. With a 12-hour time limit, competitors faced a required cutoff pace of 10.6 minutes per kilometer, making the deadline tighter than 59% of 50-mile ultras and more generous than 41%.

The course guided participants along the coast past Tywyn, Fairbourne, Fairbourne Bridge, and Barmouth before finishing at the castle town of Harlech. Field sizes remained modest compared to international peers—smaller than 71% of 50-mile events and bigger than 28%—with the 2023 edition seeing 25 runners reach the finish line.

Similar races

Other 50 mi trail ultras, closest in distance first.