Trail 100k events in the United Kingdom
Find trail 100k events in the United Kingdom. Compare 20 upcoming events by date and location. Open a race guide for the course, recorded editions and official entry information where available.
Events to explore include The Copthorne Races, Northern Traverse Series and Devon Coast To Coast Ultra Marathon.
Narrow your search to England and Wales.
Compare running races by distance, date and surface, from shorter road events to trail races and ultras.
21 listed events · 20 with upcoming dates
Upcoming 100k events
20 matching events, earliest date first. Entry availability is shown separately.
The Copthorne Races
ENGMickleham, Surrey
Looped trail ultras around Box Hill, Mickleham and Headley, with a separate Thursday start for the 200-mile event.
Date listed · latest organiser confirmation not yet checked.
Northern Traverse Series
ENGSt Bees, Cumbria / North Yorkshire
Northern Traverse Series — 300K, 100K, 80K, 55K at St Bees to Robin Hood's Bay and sectional routes across northern England.
Date listed · latest organiser confirmation not yet checked.
Devon Coast To Coast Ultra Marathon
ENGnr Plymouth, South of England
Devon Coast To Coast Ultra Marathon — Wembury, nr Plymouth. Listed on runABC (South of England).
Date listed · latest organiser confirmation not yet checked.
Jurassic Coast Ultra Challenge
ENGCorfe Castle, Dorset
Jurassic Coast Ultra Challenge in Corfe Castle.
Date listed · latest organiser confirmation not yet checked.
London 2 Brighton Ultra Challenge
ENGRichmond, Greater London
London 2 Brighton Ultra Challenge in Richmond.
Date listed · latest organiser confirmation not yet checked.
Lake District Ultra Challenge
ENGKendal, Cumbria
Lake District Ultra Challenge in Kendal.
Date listed · latest organiser confirmation not yet checked.
Cotswold Way Ultra Challenge
ENGCirencester, Gloucestershire
Cotswold Way Ultra Challenge in Cirencester.
Date listed · latest organiser confirmation not yet checked.
Race to the King
ENGWest Dean, West Sussex
Race to the King — a verified UTMB Index race for the 2026 edition.
Date listed · latest organiser confirmation not yet checked.
North Yorks Ultra Challenge
ENGScarborough, North Yorkshire
North Yorks Ultra Challenge in Scarborough.
Date listed · latest organiser confirmation not yet checked.
Ham & Lyme Summer
ENGHam Hill / Lyme Regis, Somerset / Dorset
Ham & Lyme Summer in Ham Hill / Lyme Regis.
· Entry closed
Date listed · latest organiser confirmation not yet checked.
Peak District Challenge
ENGBakewell, Derbyshire
Peak District Challenge — a verified UTMB Index race for the 2026 edition.
Date listed · latest organiser confirmation not yet checked.
Serpent Trail Race
ENGPetersfield, Hampshire
Serpent Trail Race in Petersfield.
· Status TBC
Date listed · latest organiser confirmation not yet checked.
Lakeland Trails Ultra & Ambleside Trail Runs
ENGAmbleside, Cumbria
Lakeland Trails Ultra & Ambleside Trail Runs in Ambleside.
Date listed · latest organiser confirmation not yet checked.
Race to the Stones
ENGLewknor, Oxfordshire
Race to the Stones in Lewknor.
Date listed · latest organiser confirmation not yet checked.
Gower Peninsula Ultra Challenge
WALPenrice, Swansea
Gower Peninsula Ultra Challenge in Penrice.
Date listed · latest organiser confirmation not yet checked.
Beacons Way Ultra 100KM
WALTalybont-on-Usk, Powys
Beacons Way Ultra 100KM in Talybont-on-Usk.
Date listed · latest organiser confirmation not yet checked.
Stour Valley Path Ultra Run
ENGSuffolk, Midlands
Stour Valley Path Ultra Run — Memorial Hall, Newmarket, Suffolk. Listed on runABC (Midlands).
Date listed · latest organiser confirmation not yet checked.
Foxton Hound Ultra
ENGLeicestershire, Midlands
Foxton Hound Ultra — Winwick Hall, Winwick, Leicestershire. Listed on runABC (Midlands).
Date listed · latest organiser confirmation not yet checked.
Thames Path Challenge
ENGLondon, South of England
Thames Path Challenge — Bishops Park, London. Listed on runABC (South of England).
Date listed · latest organiser confirmation not yet checked.
Chiltern Hills 100K Ultra
ENGChesham, Buckinghamshire
Chiltern Hills 100K Ultra in Chesham.
Date listed · latest organiser confirmation not yet checked.
Race archive
Past races and previous editions
Looking back at a race? Browse the guides below for recorded editions. This section also includes events awaiting a new date and cancelled editions. Previous editions of races in the upcoming calendar are available through their race guides above.
Isle of Wight Challenge
ENGChale, Isle of Wight
Isle of Wight Challenge — a verified UTMB Index race for the 2026 edition.
Next date not listed
Race guide and recorded editions →Browse states, counties and areas
Choosing a race in United Kingdom
The unfiltered upcoming calendar includes events in Ambleside (1), Bakewell (1), Chesham (1). Use the town filter to compare locations, then check the race guide for the start venue and organiser’s travel information.
Questions about 100k events in United Kingdom
What should I check before a running event in United Kingdom?
Choose your distance, then check the route, elevation, cut-off time and entry conditions in the organiser’s race guide.
Which trail 100k events are coming up in the United Kingdom?
The Copthorne Races is listed for 21 November 2026. Northern Traverse Series is listed for 3 April 2027. Devon Coast To Coast Ultra Marathon is listed for 17 April 2027. Check the race guide and organiser’s latest information before making plans.
Where can I find race entry details for the United Kingdom?
Follow the link from the race guide to the organiser or entry provider, where one is available. Check the entry deadline, eligibility and current availability there. A listed race date does not necessarily mean entries are still open.
Why has a race moved out of the upcoming calendar?
Once its listed dates have passed, a race moves to the past-editions view unless another upcoming edition is recorded. Cancelled events also leave the upcoming list. The race guide stays available, and the event returns when a new date is added.