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Get your running shoes and Lycra ready because we’ve scoured the UK for the very best races of 2025, from iconic marathons to unique triathlons and must-try duathlons. Whether you’re after a PB in a big-city marathon, fancy a scenic triathlon along the coast, or want to go off-road on mountain trails, these 21 events are a mix of the biggies you’ve heard of and a few below-the-radar gems that’ll make your training miles totally worth it. So, pin this list, mark your calendar, and get ready to sweat in style!



<h2 class="wp-block-heading" id="h-1-great-welsh-marathon"><a href="https://www.greatwelshmarathon.co.uk/" target="_blank" rel="noreferrer noopener">1. Great Welsh Marathon</a></h2>



Where? Carmarthenshire, Wales



When? 16 March 2025



Why? Step aside London, Wales&#8217; oldest marathon is where the PB chasers are headed. Picture this: stunning coastal parkland, a traffic-free trail, and a route so flat you could practically run it on rollers. Ideal for newbies and seasoned runners alike.



<h2 class="wp-block-heading" id="h-2-ashridge-duathlon"><a href="https://www.atwevents.co.uk/e/atw-ashridge-duathlon-8971" target="_blank" rel="noreferrer noopener">2. Ashridge Duathlon</a></h2>



Where? Ashridge House, Hertfordshire



When? 23 March 2025



Why? Dreaming of multisport? This duathlon through the gorgeous Ashridge Estate offers a 10K run, 44K bike ride, and a 5K run to finish – the perfect way to dust off winter cobwebs and launch your season in style.



<h2 class="wp-block-heading" id="h-3-brighton-marathon"><a href="https://www.brightonmarathonweekend.co.uk/">3. Brighton Marathon</a></h2>



Where? Brighton, England



When? 6 April 2025



Why? Sun, sea, and spectator-packed streets. This big-city marathon along Brighton’s famous seafront is a party in running shoes, with carnival vibes, thousands of supporters, and a mostly flat course made for fast times.



<figure class="wp-block-image size-full"><img decoding="async" loading="lazy" width="600" height="450" src="https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/welsh-marathon.png" alt="Best races 2025 UK" class="wp-image-99610" /><figcaption class="wp-element-caption">Running with a view on the Great Welsh Marathon </figcaption></figure>



<h2 class="wp-block-heading" id="h-4-rat-race-ultra-tour-of-arran">4. <a href="https://www.ratrace.com/ultra-tour-of-arran">Rat Race Ultra Tour of Arran</a></h2>



Where? Isle of Arran, Scotland



When? 5-6 April 2025



Why? Ready to take on “Scotland in miniature”? The Rat Race Ultra Tour of Arran is a two-day, 60-mile trail adventure across mountains, glens, and rugged coastlines. Expect serious climbs, jaw-dropping views, and enough scenic challenges to keep even seasoned trail runners on their toes. Not for the faint-hearted but pure heaven for trail junkies!



<h2 class="wp-block-heading" id="h-5-bamburgh-castle-duathlon">5. <a href="https://wilddeerevents.co.uk/events/130/bamburgh-castle-duathlons-2025-sprint-standard/" target="_blank" rel="noreferrer noopener">Bamburgh Castle Duathlon</a></h2>



When? 13 April 2025



Where? Bamburgh Castle, Northumberland



Why? A breathtaking duathlon at the iconic Bamburgh Castle! Run on scenic trails around the castle grounds, then cycle along the breathtaking Northumberland coast. Choose from Sprint or Standard distances, or team up with friends for a relay. With the transition area on the castle’s front Green, you won’t find a more stunning race setting in the UK.



<figure class="wp-block-image size-full"><img decoding="async" loading="lazy" width="1157" height="861" src="https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/Screen-Shot-2024-10-30-at-22.32.31.png" alt="Best races Uk 2025" class="wp-image-99629" srcset="https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/Screen-Shot-2024-10-30-at-22.32.31.png 1157w, https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/Screen-Shot-2024-10-30-at-22.32.31-600x446.png 600w, https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/Screen-Shot-2024-10-30-at-22.32.31-1000x744.png 1000w" sizes="(max-width: 1157px) 100vw, 1157px" /></figure>



<h2 class="wp-block-heading" id="h-6-manchester-marathon"><a href="https://www.manchestermarathon.co.uk/register-your-interest/" target="_blank" rel="noreferrer noopener">6. Manchester Marathon</a></h2>



Where? Manchester, England



When? 27 April 2025



Why? The UK’s flattest, fastest city marathon! Perfect for first-timers or anyone craving a PB, this closed-road race combines big-race energy with a feel-good festival atmosphere.



<h2 class="wp-block-heading" id="h-7-blackpool-marathon"><a href="https://www.runblackpoolfestival.com/marathon.html" target="_blank" rel="noreferrer noopener">7. Blackpool Marathon</a></h2>



Where? Blackpool, England



When? 27 April 2025



Why? Seaside vibes for the whole family! Pass by Blackpool Tower, enjoy the ocean breeze, and soak up that famous spring sunshine – this is the marathon for a spring PB and beachy fun.



<h2 class="wp-block-heading" id="h-8-great-birmingham-run"><a href="https://www.greatrun.org/events/great-birmingham-run/" target="_blank" rel="noreferrer noopener">8. Great Birmingham Run</a></h2>



Where? Birmingham, England 



When? 4 May 2025



Why? With both half marathon and 10K options, the Great Birmingham Run winds through the city’s iconic spots, including the stunning canals and buzzing streets. Expect cheering crowds, top-notch entertainment, and a festival finish line atmosphere. Whether you’re chasing a PB or just enjoying the ride, this is Brum at its best – lace up and join the fun.



<h2 class="wp-block-heading" id="h-9-milton-keynes-marathon"><a href="https://mkmarathon.com/" target="_blank" rel="noreferrer noopener">9. Milton Keynes Marathon</a></h2>



Where? Milton Keynes, England



When? 4-5 May 2025



Why? Bucks&#8217; biggest running event is here! Start with the Rocket 5K on Sunday, then tackle the Marathon, Half Marathon, or Relay on Monday – or do both for the MK Challenge medal. Add in a Superhero Fun Run for all ages and finish in style at StadiumMK, cheered on by thousands. 



<h2 class="wp-block-heading" id="h-10-edinburgh-marathon"><a href="https://www.edinburghmarathon.com/">10. Edinburgh Marathon</a></h2>



Where? Edinburgh, Scotland



When? 25 May 2025



Why? Edinburgh’s Marathon festival weekend and flat coastal route make this Scotland’s answer to the big city marathon but with races all weekend from 1k to 50k, there&#8217;s something for everyone . Fast, scenic, and sold-out year after year – you’ll need to be quick off the blocks to nab a spot.



<figure class="wp-block-image size-full"><img decoding="async" loading="lazy" width="1024" height="683" src="https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/run-hill-.jpg" alt="best races 2025 " class="wp-image-99649" srcset="https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/run-hill-.jpg 1024w, https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/run-hill--600x400.jpg 600w, https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/run-hill--1000x667.jpg 1000w" sizes="(max-width: 1024px) 100vw, 1024px" /></figure>



<h2 class="wp-block-heading" id="h-11-celtman-extreme-triathlon"><a href="https://cxtri.com/">11. Celtman Extreme Triathlon</a></h2>



Where? Torridon, Scotland



When? 14 June 2025



Why? Not for the faint-hearted, this extreme triathlon on Scotland’s rugged west coast is a test of true grit – with a mountain run that’ll make you feel invincible.



<figure class="wp-block-image size-full"><img decoding="async" loading="lazy" width="2560" height="1707" src="https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/emma-simpson-mNGaaLeWEp0-unsplash-scaled.jpg" alt="Best races 2025" class="wp-image-99633" srcset="https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/emma-simpson-mNGaaLeWEp0-unsplash-scaled.jpg 2560w, https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/emma-simpson-mNGaaLeWEp0-unsplash-600x400.jpg 600w, https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/emma-simpson-mNGaaLeWEp0-unsplash-1000x667.jpg 1000w, https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/emma-simpson-mNGaaLeWEp0-unsplash-1536x1024.jpg 1536w, https://dev.muddystilettos.co.uk/wp-content/uploads/2024/10/emma-simpson-mNGaaLeWEp0-unsplash-2048x1365.jpg 2048w" sizes="(max-width: 2560px) 100vw, 2560px" /></figure>



<h2 class="wp-block-heading" id="h-12-blenheim-palace-triathlon"><a href="https://www.blenheimtriathlon.com/">12. Blenheim Palace Triathlon</a></h2>



Where? Blenheim, Oxfordshire



When? 7-8 June 2025



Why? Want a multisport taster in a stunning setting? Blenheim offers a lovely, beginner-friendly triathlon option, perfect for a summer’s day with friends and family cheering you on.



<h2 class="wp-block-heading" id="h-13-croyde-ocean-triathlon"><a href="https://croydeocean.co.uk/">13. Croyde Ocean Triathlon</a></h2>



Where? Croyde, Devon



When? 6 July 2025



Why? Coastal lovers, rejoice! This triathlon boasts a scenic 37K bike ride and hills galore. Think ocean views, lush Devon hills, and a race so beautiful you won’t want it to end.



<h2 class="wp-block-heading" id="h-14-outlaw-triathlon"><a href="https://www.outlawtriathlon.com/">14. Outlaw Triathlon</a></h2>



Where? Nottingham, England



When? 26-27 July 2025



Why? Outlaw is known for its stellar support and flat, smooth course – perfect for long-distance tri newbies wanting to tackle that 140.6 miles in a friendly setting.



<h2 class="wp-block-heading" id="h-15-new-forest-marathon"><a href="https://www.newforestmarathon.co.uk/home/#top">15. New Forest Marathon</a></h2>



Where? Brockenhurst, England



When? 14 September 2025



Why? Run through ancient woodland, past ponies, and through quaint villages in the gorgeous New Forest. A firm fave for nature-loving runners.



<h2 class="wp-block-heading" id="h-16-loch-ness-marathon"><a href="https://lochnessmarathon.com/">16. Loch Ness Marathon</a></h2>



Where? Inverness, Scotland



When? 28 September 2025



Why? Scenic, legendary, and a tad spooky – Loch Ness is the marathon to run if you’re into mythical monsters, Scottish hospitality, and jaw-dropping views.



<h2 class="wp-block-heading" id="h-17-isle-of-wight-marathon"><a href="https://www.rydeharriers.co.uk/isle-of-wight-marathon-race">17. Isle of Wight Marathon</a></h2>



Where? Isle of Wight, England



When? 5 October 2025



Why? A historic, undulating route that’s been going strong since 1957. Expect sea views, rolling hills, and a good dose of island charm.



<h2 class="wp-block-heading" id="h-18-kielder-marathon"><a href="https://kieldermarathon.com/event-item/marathon/">18. Kielder Marathon</a></h2>



Where? Kielder, Northumberland



When? 5 October 2025



Why? Dubbed &#8216;Britain’s Most Beautiful Marathon&#8217;, the Kielder Marathon Weekend is packed with stunning races for all ages and abilities. Kick things off with a 10K &amp; Gravel Duathlon on Saturday, followed by Sunday’s Half Marathon and Junior races, leading up to the marathon finale. Expect an electric atmosphere and unforgettable views in one of the UK’s most scenic spots



<h2 class="wp-block-heading" id="h-19-portsmouth-coastal-marathon"><a href="https://www.fitprorob.biz/event/pcwmevent2025/">19. Portsmouth Coastal Marathon</a></h2>



Where? Portsmouth, England



When? 21 December 2025



Why? Cap off your year with a flat, seaside marathon. With holiday cheer and coastal views, this multi-terrain race is the perfect way to run off the Christmas treats. 



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Fitness goals: 19 of the best UK races to train for in 2025

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