Runs, swims, duathlons & triathlons
ATW Events caters to athletes of all levels, from beginners to experienced competitors. They provide well-organized, chip-timed events that support local communities and charities.
- Running events - from fun runs to festivals including 5K runs, 10K runs and half marathons
- Triathlons - including the ATW Grafman & ATW Odyssey Triathlons
- Duathlons & aquabikes - including the Sprint Duathlon European Qualifier event
ATW events in 2025/26
- Sun 1 Feb
- £12-£38
ATW Watford Half Marathon, 10K & Fun Run
This popular event has a strong history within the running community and has been taking place for over 40 years! Join a day of running, community spirit and exciting experiences.
- Fun run
- Half marathon
- 10K run
- Sat 7 Feb
- £45-£85
Dorney Duathlon | Feb
Take on a Super Sprint, Sprint or Standard distance and take the opportunity to race around this unique and inspiring Olympic venue!
- Super sprint duathlon
- Sprint duathlon
- Standard duathlon
- Sun 15 Feb
- £28-£30
ATW Love Welwyn Garden City 10K
11th anniversary! Welcome to the Love Welwyn Garden City 10K — historically held around Valentine's Day this is the event that encourages you to fall in love with running.
- 10 km road running + 246 ft ascent
- Sun 22 Feb
- £28-£38
ATW Bedford Half Marathon & 10K
This chip timed event is a sure-fire guarantee to give you the best chance of a PB in the Half Marathon or 10K.
- 10K run
- Half marathon
- Sun 1 Mar
- £19-£31
ATW Great Yarmouth Seafront Half Marathon, 10K & 5K
Combines the thrill of running and the picturesque charm of Great Yarmouth over a fast-paced course through the town's rich history and vibrant landscapes.
- 10K run
- Half marathon
- 5K run
- Sun 8 Mar
- £45-£85
Dorney Duathlon | March
Take on a Super Sprint, Sprint or Standard distance and take the opportunity to race around this unique and inspiring Olympic venue!
- Super sprint duathlon
- Sprint duathlon
- Standard duathlon
- Sun 8 Mar
- £20-£38
ATW Nottingham Holme Run
Join this fantastic experience on a completely flat course – perfect for achieving your personal best over a certified, accurate route, with free race photo, custom medal and friendly support!
- 5K run
- 10K run
- Half marathon
- Sun 15 Mar
- £18-£29
ATW Debden 10K and 5K
This disused airfield has a fast, flat, tarmac course with no sharp corners, and the surrounding tree cover makes for relatively still conditions on most days - but your PB or run stress-free.
- 5K run
- 10K run
- Sun 15 Mar
- £22-£36
Essex 20
The Essex 20 is held annually and is an ideal 20-mile race for the build-up to Marathon season, set over a 5-lap, flat, fast, tarmac course. Also hosting the Essex County Road Running Championships.
- Road run 2
- Sun 22 Mar
- £28-£38
ATW Run Fest at Lee Valley
Smash your personal best on a traffic-free, flat and fast course from the White Water Centre and into surrounding beautiful regional parkland with a custom-designed medal for finishers.
- 10K run
- Half marathon
- Sun 22 Mar
- £32-£34
Hillingdon 20
The Hillingdon 20, (formerly the Finchley 20), is the longest-running 20-mile race in the UK. A hilly 20 mile road race, an ideal build-up to the London or other spring marathons.
- 20 miles road running + 738 ft ascent
- Sat 28 Mar
- £86
Fortitude Ultra | Pippingford
10 Hours • 10 Laps • You vs You. You will be awarded an event medal and coloured finisher's shirt based on your ability to complete 10 laps of the 3-mile, 4-mile or 5-mile loops in the given time.
- 10 hrs trail running + 1824 ft ascent
- Fri 3 Apr
- £28-£30
ATW St Albans Easter 10K
A flat, fast and chip timed event - it's a sure-fire guarantee to give you the best chance of a PB in the 10K.
- 10 km road running + 108 ft ascent
- Sat 4 Apr
- £45-£85
Dorney Duathlon | April
Take on a Super Sprint, Sprint or Standard distance and take the opportunity to race around this unique and inspiring Olympic venue!
- Super sprint duathlon
- Sprint duathlon
- Standard duathlon
- Mon 6 Apr
- FREE-£36
ATW Stevenage Spring Half Marathon & 10K
From the fantastic Ridlins Stadium athletics track, wind your way around superb traffic-free tarmac routes and enjoy the beautiful Fairlands Valley Park the return to a vibrant event village!
- Fun run
- 10K run
- Half marathon
- Sun 12 Apr
- £46-£58
ATW Mallory Park Duathlon - Incorporating the Draft-Legal Sprint Duathlon Age Group Qualifier (World Championship)
Experience the thrill of multisport racing at the ATW Mallory Park Duathlon — a fast, flat, and traffic-free course on one of the UK’s most iconic race circuits.
- Super sprint duathlon
- Sprint duathlon 2
- Sun 12 Apr
- £8-£27
ATW Mallory Park Runs
Gear up for an adrenaline-packed running experience like no other at Mallory Park Motor Racing Circuit with fast laps, great support and distances suited to every runner’s goals.
- Fun run
- 5K run
- 10K run
- Sun 19 Apr
- FREE-£21
Cambridge Biomedical Campus 10K, 5K and Fun Run
Run, walk or cheer on family at this traffic-free campus event, with 10K, 5K and fun run options supporting local charities and welcoming all ages.
- Fun run
- 5K run
- 10K run
- Short walk
- Sun 26 Apr
- £20-£74.50
Woking Spring Triathlon & Junior Aquathlon
Kick-start the season with a friendly spring triathlon and junior aquathlon, combining safe racing, supportive organisation and smooth courses perfect for confidence-building and early-season speed.
- Super sprint triathlon
- Sprint triathlon
- Sprint aquathlon
- Kids aquathlon 5
- Sat 2 May
- £58-£120
Dorney Triathlon | May
Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sun 3 May
- £57-£119
ATW St Neots Triathlon | Race 1
Stunning riverside venue! Swim in the beautiful River Ouse, cycle through scenic villages and run around Riverside Park in a triathlon or aquabike event of your choice.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Sun 10 May
- £44-£49
HSV Sprint Triathlon & Aquabike
This is a great race for all standards, from the absolute beginner right through to the seasoned triathlete. The course is fast, flat and has great PB potential.
- Sprint triathlon
- Sprint aquabike
- Sat 16 May
- £79-£180
ATW Big East & Maldon Triathlon
The Big East and Maldon Triathlon is brought to you by the largest triathlon organiser in the UK! A great experience featuring a tidal river swim.
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Half Ironman
- Middle aquabike
- Sat 23 May
- £130
ATW Box End Mixed Team Relay
Unleash your team’s speed and strategy in an exhilarating mixed relay, racing through swim–bike–run laps at Box End’s stunning, spectator-friendly lakeside venue.
- 350 m lake swimming
- 7.7 km road cycling + 102 ft ascent
- 1 km road running
- Sun 24 May
- £67-£139
ATW Box End Triathlon
Experience a choice of multi-sport events — triathlon, relay triathlon and aquabike — at a stunning watersports venue with pristine water, scenic routes, a custom medal and more.
- Sprint triathlon
- Sprint aquabike
- Olympic triathlon
- Standard aquabike
- Half Ironman
- + 1 more race
- Wed 27 May
- £58-£78
Midweek Dorney Triathlon | May
Take on this multi-activity event and take the opportunity to race around this unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Sprint aquabike
- Sat 6 Jun
- £58-£120
Dorney Triathlon | June
Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sun 7 Jun
- £146-£187
ATW Grafman Middle Distance Triathlon & Aquabike
One of the country’s most popular middle distance swim-bike-run events, delivered by triathletes for triathletes, at the beautiful and iconic Grafham Water.
- Half Ironman
- Middle aquabike
- Sun 14 Jun
- £11-£40
ATW St Albans Half Marathon, 10K, 5K & Fun Run
A community-focused event, ATW St Albans Half Marathon aims to raise money for local charities and organisations as well as put on a great day out for all the family, delivered by runners for runners.
- Fun run
- 5K run
- Half marathon
- Challenge walk
- 10K run
- Sun 21 Jun
- £66-£119
ATW Stewartby Lake Triathlon & Aquabike
Dive into the ATW Stewartby Lake Triathlon and Aquabike – a flat, fast and friendly race offering stunning lake views, smooth roads, and surefire PB potential.
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sat 27 - Sun 28 Jun
- £20-£99
ATW Triathlon | Mallory Park
Mallory Park Triathlon Extravaganza: A traffic-free triumph! A thrilling and safe circuit nestled in picturesque surroundings, boasting its own self-contained swimming lake.
- Super sprint triathlon
- Sprint triathlon
- Super sprint aquabike
- Sprint aquabike
- Novice triathlon
- Sat 27 Jun
- £20-£31
ATW Childrens Triathlon Mallory Park
Mallory Park Junior Triathlon: Where dreams take flight! Nurturing the next generation of triathletes, providing a safe and exhilarating environment for children to discover the thrill of multisports.
- Kids triathlon 5
- Wed 1 Jul
- £58-£78
Midweek Dorney Triathlon | July
Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Sprint aquabike
- Sun 5 Jul
- £69-£175
ATW Odyssey At Box End Triathlon
Get ready for one of the UK’s most exciting triathlon events of the year! Dive into crystal-clear lake waters at Box End, then ride a smooth, rolling bike course and follow scenic on-site run paths.
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Sprint aquabike
- Standard aquabike
- + 1 more race
- Sun 12 Jul
- £65-£115
ATW Bristol Triathlon
Swim, bike, and run through an iconic city backdrop with a flat, fast course and incredible atmosphere — one of the UK's most-popular 'closed-road' triathlons.
- Sprint triathlon
- Sprint aquabike
- Olympic triathlon
- Standard aquabike
- Sun 12 Jul
- £58-£120
Dorney Triathlon | July
Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sat 18 Jul
- £265-£293
- Early bird
Castle To Coast Triathlon
A one-of-a-kind triathlon adventure from castle to coast – swim, bike, run and soak up the best of the North and South Downs, fully supported all the way, no navigation needed!
- 1.2 miles lake swimming
- 66 miles road cycling + 3550 ft ascent
- 14 miles trail running + 1512 ft ascent
- Sun 19 Jul
- £27-£29
ATW St Albans Summer 10K
ATW brings you the St Albans Summer 10K with a twist! Flat, fast and chip-timed with pacers to help you achieve a PB, plus buzzing event village for all the family with music, play zone and ice cream.
- 10 km road running + 108 ft ascent
- Sun 26 Jul
- £58-£120
Dorney Triathlon | July
Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sat 1 Aug
- £60-£85
ATW Mallory Park Triathlon - Incorporating the 2027 European Age Group Championship Sprint Triathlon Qualifier
Mallory Park delivers a fast, unforgettable triathlon experience with smooth tarmac, a traffic-free circuit and a clean enclosed lake — an exhilarating, athlete-friendly venue.
- Super sprint triathlon
- Sprint triathlon
- Fri 7 Aug
- £12-£22
ATW Colchester Friday Night Runs
Race under the lights at a fast, friendly Friday night 5K, featuring the Essex 5K County Championships and a buzzing summer atmosphere with great support.
- Fun run
- 5K run
- Sat 8 Aug
- £145-£285
- Early bird
ATW Odyssey Triathlon
Complete your own Odyssey on a journey of self-discovery in the Cambridgeshire countryside featuring a swim in the River Ouse, a scenic ride and a run around the beautiful town of St Neots.
- Ironman
- Half Ironman
- Sat 8 Aug
- £120-£210
ATW Odyssey Aquabike
Complete your own Odyssey on a journey of self-discovery in the Cambridgeshire countryside comprising a swim in the meandering River Ouse followed by a cycle around scenic countryside.
- Long aquabike
- Middle aquabike
- Sat 8 Aug
- £67-£119
ATW St Neots Triathlon | Race 2
Stunning riverside venue! Swim in the beautiful River Ouse, cycle through scenic villages and run around Riverside Park in a triathlon or aquabike event of your choice.
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Sprint aquabike
- Sat 8 Aug
- £58-£120
Dorney Triathlon | August
Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sat 8 Aug
- £56-£285
ATW First To Full Triathlon Festival
Be part of a UK first. This isn’t just another triathlon—it’s the first event of its kind where you decide the distance, from sprint to full, and race your way.
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Ironman
- Sprint aquabike
- + 4 more races
- Sat 8 Aug
- £56-£95
ATW Odyssey12
The ATW Odyssey 12hr Run is more than just a running event, its a journey of self-discovery through the beautiful multi-terrain footpaths around St Neots.
- 12 hrs trail running
- Sun 16 Aug
- £56-£97
ATW Oundle Triathlon
ATW is the largest triathlon organiser in the UK and is bringing you the Oundle Triathlon! It doesn’t matter if you are an experienced triathlete or this is your very first attempt at swim-bike-run.
- Super sprint triathlon
- Sprint triathlon
- Sprint aquabike
- Sun 16 Aug
- £22-£31
ATW Oundle Children’s Triathlon
A fun, friendly and fully supported triathlon for children of all abilities — perfect for first-timers looking to experience the thrill of swim, bike and run in Oundle.
- Kids triathlon 5
- Wed 26 Aug
- £58-£78
Midweek Dorney Triathlon | August
Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Sprint aquabike
- Sat 5 - Sun 6 Sep
- £12-£39
ATW Bedford Running Festival
More than just a running race! Join thousands at Bedfordshire’s most popular weekend of running with festival magic, live music, bar, yoga, kids zone, street food, outdoor cinema and fun fair!
- Fun run
- 5K run
- 10K run
- Half marathon
- Road run
- Sun 13 Sep
- £20-£74.50
Woking Autumn Triathlon & Junior Aquathlon
Dive into clear waters, ride fast on quiet roads and run strong at a friendly, autumn challenge offering triathlon and aquathlon options for all ages and abilities.
- Super sprint triathlon
- Sprint triathlon
- Kids aquathlon 5
- Sprint aquathlon
- Sun 20 Sep
- £57-£119
ATW St Neots Triathlon | Race 3
Stunning riverside venue! Swim in the beautiful River Ouse, cycle through scenic villages and run around Riverside Park in a triathlon or aquabike event of your choice.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Sprint aquabike
- Sat 26 Sep
- £77-£118
ATW Grafham Triathlon
Sprint or Standard Tri or Aquabike, in and around the beautiful, clean reservoir, on a flat course for all abilities with custom-designed medal, free photos and finish line goodies.
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Sat 26 Sep
- £58-£120
Dorney Triathlon | September
Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sat 3 Oct
- £45-£85
Dorney Duathlon | October
Take on a Super Sprint, Sprint or Standard distance and take the opportunity to race around this unique and inspiring Olympic venue!! This event is draft-illegal.
- Super sprint duathlon
- Sprint duathlon
- Standard duathlon
- Sun 4 Oct
- FREE-£37
- Early bird
ATW Welwyn Half Marathon & Fun Run
The popular Welwyn Half Marathon starts and finishes on the impressive 400m athletics track at Gosling Sports Park with an ideal, traffic-free, disused railway line in between.
- Fun run
- Half marathon
- 10K run
- Fri 16 Oct
- £16-£25
ATW Neon Run 5K & 10K
Get ready to light up your Friday night at the brand-new ATW 5K & 10K Neon Run, an exciting evening running event coming to Cyclopark in Gravesend.
- 5K run
- 10K run
- Sun 25 Oct
- £54-£79
ATW Grafham Duathlon
Your chance to race at the iconic Grafham Water, one of the UK’s most celebrated multisport venues. Push your pace on this fast, scenic duathlon course which welcomes all levels.
- Sprint duathlon
- Standard duathlon
- Sun 1 Nov
- FREE-£33
ATW Bedford 10K & Half Marathon
Chase your personal best on one of the UK’s flattest, fastest and most scenic courses, looping the River Ouse and Priory Park in a spectacular Bedford run.
- Fun run
- 10K run
- Half marathon
- Sat 7 Nov
- £9-£34
ATW Remembrance Runs
Join ATW for the Remembrance Runs at The Carver Barracks, (Formerly Debden Airfield), in Essex to help honour our fallen heroes and raise money for this fantastic military charity.
- Fun run
- 5K run
- 10K run
- Half marathon
- Sun 8 Nov
- £45-£85
Dorney Duathlon | November
Take on a Super Sprint, Sprint or Standard distance and take the opportunity to race around this unique and inspiring Olympic venue!!
- Super sprint duathlon
- Sprint duathlon
- Standard duathlon
- Sun 29 Nov
- £23-£25
ATW Hatfield 5
Join the 12th Year of the Hatfield 5, now featuring the Herts County Senior Championships. This is the region's fastest 5 miler (3rd fastest time in the UK 2022).
- Road run
- Sun 6 Dec
- £28-£33
ATW Grafham Water 10 Mile
The most scenic running event in Cambridgeshire! You are invited to the beautiful Grafham Water to tackle a scenic 10-mile trail run that circumnavigates the reservoir.
- 10 miler
- CaniCross
- Sun 20 Dec
- £14-£32
ATW Nottingham Holme Run
This fantastic, traffic-free, pancake-flat event takes place at the scenic National Water Sports Centre in Nottingham, offering a perfect setting for runners of all abilities.
- 5K run
- 10K run
- Half marathon
- Thu 31 Dec
- From £25
ATW St Albans New Years Eve 10K
Finish the year with a brand new PB and celebrate the arrival of a brand new year with a glass of fizz and a healthy twist at this New Year's Eve running extravaganza.
- 10 km road running + 92 ft ascent