Marathons in United Kingdom
40 upcoming 42 km marathons in United Kingdom for 2026 — curated on Run Atlas.
Planning a marathon in United Kingdom for 2026? Run Atlas lists 40 upcoming 42 km races — from big city events to scenic regional courses.
Whether you are chasing a personal best or your first finish line, comparing dates early helps you secure a start slot and build your training block around the right peak.
Use the calendar below to browse marathons month by month. June 2026 is a busy month in our listings when several races cluster on weekends.
Rain or shine — plan your race day
Calendar of marathons in United Kingdom
All upcoming 42 km marathons in United Kingdom, grouped by month.
June 2026
- Penn 7🇬🇧Princes Risborough
Road runs — 1.6 km
- Cornish Marathon🇬🇧Liskeard
Road runs — 42.195 km
- Dell Technologies Management Challenge🇬🇧Hay-on-Wye
Road runs — 42.195 km
- Dartmoor Discovery Ultra Marathon🇬🇧Princetown
Trail runs — 42.195 km
- Orion Harriers Marathon🇬🇧Chingford
Road runs — 42.195 km
- Rainbow Run Cornwall🇬🇧St Austell
Walk — 42.195 km
- Windermere Marathon🇬🇧Windermere
Road runs — 42.195 km
- Belfast City Marathon🇬🇧Belfast
Road runs — 42.195 km
July 2026
September 2026
- Leighton 10k🇬🇧Leighton Buzzard
Road runs — 42.195 km
- The Purbeck Marathon🇬🇧Swanage
Trail runs — 42.195 km
- Mourne Mountain Marathon🇬🇧Newcastle
Trail runs — 42.195 km
- Richard Bennett Felixstowe Coastal 10M🇬🇧Felixstowe
Road runs — 42.195 km
- The Endless Garden – A Backyard Ultra Marathon🇬🇧Welwyn Garden City
Trail runs — 42.195 km
- Loch Ness Marathon🇬🇧Inverness
Road runs — 42.195 km
October 2026
- Clarendon Marathon🇬🇧Salisbury / Winchester
Road runs — 42.195 km
- Standard Chartered Jersey Marathon🇬🇧St Helier
Road runs — 42.195 km
- The Abingdon Marathon🇬🇧Abingdon
Road runs — 42.195 km
- Marathon Eryri🇬🇧Llanberis
Road runs — 42.195 km
- Beachy Head Marathon Weekend🇬🇧Eastbourne
Trail runs — 42.195 km
- Snowdonia Marathon🇬🇧Snowdonia
Road runs — 42.195 km
November 2026
February 2027
March 2027
April 2027
Many runners look for a flagship race in the capital. London often hosts the most iconic marathon in United Kingdom, but smaller towns offer quieter starts and fast, flat profiles.
Check registration windows as soon as you pick a date — popular spring and autumn weekends fill up months ahead.
World Marathon Majors in United Kingdom are highlighted separately — bookmark your favourites on Run Atlas and set a RaceAlert when registration opens.
