Guildford Triathlon (RunThrough, Surrey Sports Park)
Guildford, United Kingdom · July · RunThrough (earlier years: aat events)
Course: 0.5 km (0.3 mi) swim, 23 km (14.3 mi) bike, 5 km (3.1 mi) run. 500 m (547 yd) pool, 23 km (14.3 mi) bike per the 2026 athlete guide (listings give 22 km / 13.7 mi; Racecheck lists 23 km), 5 km (3.1 mi) trail run (Racecheck lists 5.8 km / 3.6 mi from earlier years).
Why people love it
- 500 m (547 yd) swim in a clean 50 m (55 yd) pool, started one swimmer at a time.
- Friendly marshals and a clear pre-race video; reviewers often call it a good first triathlon.
- Race-morning pack pickup, bag drop and one transition, with parking a short walk from the pool.
- Trail run through university grounds and forest, with views toward Guildford Cathedral.
Watch out for
- All athlete reviews date from 2016 to 2019, under the previous organiser. Nobody has written up RunThrough's editions yet.
- Early years had swim queues of up to 50 minutes; 2018 and 2019 reviewers found the swim better run.
- Bike roads are open, with a timed stop at lights, speed bumps and roundabouts. No water or puncture help.
- The 5 km (3.1 mi) run is uneven trail with one water point at 1.5 km (0.9 mi).
- Pool to transition is a 300 m (330 yd) run, and the hot 2018 race brought dehydration complaints.
Race
How racers feel about it, how well it is run, and how it treats a first timer. Counts for 30% of the overall score.
Toughness: Tough
- Racer satisfactionLoved3.8
Racecheck average 4.02/5 from 80 reviews, all 2016 to 2019 under the previous organiser; praised marshals and pool, disliked swim queues. · Medium confidence
- OrganizationAdequate3.4
Reviews from 2016 to 2019 report swim queues, out-of-order starts and timing-chip failures; the current organiser has no athlete reviews yet. · Low confidence
- First timer friendlyFriendly4.1
Many first-timers liked the 500 m (547 yd) pool swim and friendly marshals; the rugged 5 km (3.1 mi) trail run is the catch. · Medium confidence
Course traits, not part of the score
- PR potentialAverage2.9
Open roads with a timed stop, speed bumps, about 180 m (590 ft) of climbing and a rough trail run; slower than most sprints. · Low confidence
Swim
Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 16% of the overall score.
- Wetsuit legalRarelyn/a
Pool swim, so wetsuit_legal is not applicable. · High confidence
- Water temperatureComfortable4.2
Heated leisure pool; temperature not published, typically 27 to 29 °C (81 to 84 °F). Reviewers made no complaints. · Low confidence
- Calm waterRoughn/a
Pool swim, so calm_water is not applicable. · High confidence
- Swim easeEasy4.3
500 m (547 yd) in a 50 m (55 yd) pool; occasional overtaking and ducking under lane ropes; no sighting needed. · Medium confidence
- Swim experienceGreat3.5
Clean modern 50 m (55 yd) pool praised, but reviewers waited up to 50 minutes and saw out-of-order starts. · Medium confidence
- Swim supportGood4.4
Pool with lifeguards, mandatory poolside briefing, wristband and cap for identification; no open-water risk. · Medium confidence
Bike
Road surface, closures, scenery and wind. Counts for 18% of the overall score.
- Road surfaceMixed3.3
Speed bumps and roundabouts noted; no potholes complained about; surface not discussed in detail. · Low confidence
- Road closuresMostly open2.2
Roads are open to vehicles (2026 guide); early Sunday start but later waves met traffic; marshals at junctions. · Medium confidence
- Bike sceneryBeautiful3.6
Reviewers called it a scenic country ride; one called it flat and boring; towards Worplesdon, Pirbright and Normandy. · Low confidence
- WindMostly calm3.5
Wind not mentioned in reviews; Surrey lanes with some shelter. · Low confidence
Course traits, not part of the score
- Bike speedAverage3.1
23 km (14.3 mi) undulating open roads; timed stop at traffic lights, speed bumps and roundabouts slow riders. · Low confidence
- Bike flatnessRolling3.4
About 180 m (590 ft) of climbing over 23 km (14.3 mi); reviewers called it gently undulating with a few hills. · Low confidence
- Bike simplicitySome technical parts3.2
Roundabouts, speed bumps and a set of traffic lights with a timed dead zone near the start. · Low confidence
Run
Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.
- Crowd supportDecent2.8
Trail run through grounds and forest; supporters mostly at the finish and event village. · Low confidence
- Aid stationsStandard3.0
Racecheck aid stations 3.56/5 (52 ratings); one water station at 1.5 km (0.9 mi) on the run, none on the bike; water at the finish. · Medium confidence
- Run sceneryBeautiful4.0
Forest and farmland trail with views toward Guildford Cathedral. · Medium confidence
- Run conditionsModerate2.6
Uneven ground, tree roots, mud in wet weather and, in 2018, overgrown sections; trail shoes advised. · Medium confidence
Course traits, not part of the score
- Run flatnessRolling3.0
Reviewers call the 5 km (3.1 mi) trail loop hilly and uneven; elevation is not published. · Low confidence
Conditions
Air temperature, how predictable the weather is, setting, and spectating. Counts for 13% of the overall score.
- Air temperaturePleasant3.9
Late July mornings are typically 13 to 24 °C (55 to 75 °F); 2018 was hot and some racers reported dehydration. · Low confidence
- Weather reliabilityVariable3.4
UK summer; reports of heat in 2018 and mild conditions in 2019. · Low confidence
- Venue beautyLovely3.5
University sports park with forest trail and cathedral views; functional rather than scenic. · Low confidence
- Spectator friendlySome viewpoints3.4
Pool viewing and the event village; run is on trails away from the pool. · Low confidence
Course traits, not part of the score
- Low altitudeSea level4.7
Stag Hill is about 60 m (200 ft) above sea level. · Medium confidence
Stay and travel
Hotels, walkability, getting there, and the town around the race. Counts for 10% of the overall score.
- Hotel availabilityGood3.8
Guildford has many hotels; no event-weekend data. · Low confidence
- Hotel valueNormal3.2
Surrey prices; no race-week data found. · Low confidence
- WalkabilitySome driving3.0
Parking is a short walk; transition and registration are a 5-minute walk from the pool; swim exit to transition is 300 m (328 yd). · Medium confidence
- Travel easeEasy4.4
Guildford station 2 km (1.2 mi); Heathrow about 38 km (24 mi) by road. · Medium confidence
- LogisticsSome complexity3.3
Race-morning pack pickup 90 minutes before wave, one transition, bag drop; but pool and transition are apart and the pool starts in waves. · Medium confidence
- Town and foodGood4.0
Guildford town centre 2 km (1.2 mi); cafe at the sports park. · Low confidence
Key facts
- Location
- Guildford, Surrey, United Kingdom
- Typical month
- July
- Latest or next date
- 26 July 2026
- Organiser
- RunThrough (earlier years: aat events)
- First held
- 2016
- Distances (non-standard)
- 0.5 km (0.3 mi) swim, 23 km (14.3 mi) bike, 5 km (3.1 mi) run
- Swim venue
- Surrey Sports Park 50 m pool (pool)
- Wetsuit
- Not applicable (pool)
- Swim start
- pool time-trial: athletes set off one by one in number order, next swimmer starts when the one ahead is halfway down the lane; three waves (07:00, 07:45, 08:45)
- Bike climbing
- 180 m (590 ft)
- Bike laps
- 1
- Run laps
- 1
- Run shade
- forest paths in part
- Air temperature
- 13–24 °C (55–75 °F)
- Humidity
- moderate
- Altitude
- 60 m (195 ft)
- Nearest airport
- London Heathrow (LHR), 38 km (24 mi) away
- Where to stay
- Guildford town centre, Stag Hill / University of Surrey
- Booking
- Guildford has plenty of hotels. Distance to Heathrow is an approximate road estimate, 38 km (24 mi).
What racers and reviewers say
- Racecheck (80 verified reviews)Raced 2019 · aggregator · Positive
Racecheck shows 4.02/5 from 80 reviews (2016 to 2019; 2019 average 4.37). Reviewers agree on friendly marshals, a clean modern 50 m (55 yd) pool, a pleasant bike route and a good first-triathlon day. Recurring complaints: swim start queues and out-of-order starts, congestion at transition entry and exit, a long walk from pool to transition, uneven and hilly trail run, no drinks on the bike or early on the run in hot weather, and timing-chip failures in 2018. 2016 and 2017 had the most organisation complaints; 2018 and 2019 reviewers said the swim was better run. All reviews predate the RunThrough takeover.
“Great event, especially for first timers.”
Raced Guildford Triathlon (RunThrough, Surrey Sports Park)? Your notes on the course, conditions and logistics help the next athlete decide.
Sources
Pages we used for facts and ratings. See how we rate.
Training for Guildford Triathlon (RunThrough, Surrey Sports Park)? Moku Coach builds your plan around race day.