Blenheim Palace Triathlon
Woodstock, United Kingdom · June · Independent (Supertri Blenheim)
Course: 0.8 km (0.5 mi) swim, 19.8 km (12.3 mi) bike, 5.4 km (3.4 mi) run. 750 m (0.47 mi), 19.8 km (12.3 mi), 5.4 km (3.4 mi). A 2013 blogger measured the swim at 705 m (0.44 mi), run 5.5 km (3.4 mi).
Why people love it
- Transition is in the palace courtyard, with the lake and grounds around you.
- Bike and run are on closed estate roads and paths.
- The 400 m (0.25 mi) super sprint is a gentle first triathlon.
- Free competitor parking and big, noisy crowds on the finish straight.
- Wave starts and marshals on a wide, easy-to-sight lake course.
Watch out for
- Long, steep, barefoot run uphill from the lake to the courtyard transition.
- Three-lap bike has two climbs a lap and a steep descent to a blind corner.
- Wetsuit is compulsory, so practise getting it off quickly on the uphill run.
- Rain in 2025 and 2026 made roads slippery; pack for wet weather.
- Spectators need pre-booked tickets and parking is for competitors only.
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 satisfactionLoved4.2
Racers from 2012 to 2026 describe a lively, well-supported day in the palace grounds. Most reports are older, and all are positive. · Medium confidence
- OrganizationWell run4.0
Marshals and briefings are praised, and Supertri is credited in 2026. A bus-damaged footbridge forced a dismount on every bike lap in 2013. · Medium confidence
- First timer friendlyFriendly4.0
Super sprint and wave starts suit beginners; the hilly bike and steep climb to transition add effort. · Medium confidence
Course traits, not part of the score
- PR potentialAverage2.8
Hilly three-lap 19.8 km (12.3 mi) bike and a climb on each run lap make it slower than flat sprints. · Medium confidence
Swim
Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 16% of the overall score.
- Wetsuit legalAlmost always4.6
Wetsuits are compulsory under British Triathlon rules, so there is no swimsuit option. Rentals were offered in 2025. · Medium confidence
- Water temperatureComfortable3.5
Water temperature is not published. One 2026 racer found the lake warmer than expected. · Low confidence
- Calm waterMostly calm3.7
Sheltered park lake, though swimmers in 2024 and 2026 reported some chop. · Medium confidence
- Swim easeEasy3.7
Wide lake and one turn, but deep-water wave starts and some chop in 2024 and 2026. · Medium confidence
- Swim experienceGreat4.0
Calm starts in a palace-park lake that racers called serene. The slippery exit and steep barefoot climb to transition take the shine off. · Medium confidence
- Swim supportGood4.0
Marshals help at the slippery exit, wave starts spread the field and wetsuits add buoyancy. A 400 m (0.25 mi) super sprint is offered. · Medium confidence
Bike
Road surface, closures, scenery and wind. Counts for 18% of the overall score.
- Road surfaceMixed3.3
Estate roads with a bumpy bridge. Racers in 2025 and 2026 found them slippery when wet. · Low confidence
- Road closuresFully closed4.7
Estate roads are traffic-free for the race, as reported in 2008 and 2026. · High confidence
- Bike sceneryBeautiful4.2
Parkland and woodland of the palace estate; racers describe the bike as scenic. · Medium confidence
- WindMostly calm3.5
Wooded estate with few wind complaints, though the 2026 race was reported windy and wet. · Low confidence
Course traits, not part of the score
- Bike speedAverage3.0
Short and fast by reports, slowed by a bumpy bridge and a blind corner. · Low confidence
- Bike flatnessRolling2.7
Two decent climbs a lap over three laps; total gain is not published. · Low confidence
- Bike simplicitySome technical parts2.6
Three laps with passing, tight turns, and a steep descent to a blind corner that is slippery when wet. · Medium confidence
Run
Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.
- Crowd supportStrong4.2
Strong crowds at the palace forecourt and finish straight, mentioned by racers from 2012 to 2026. · Medium confidence
- Aid stationsGood3.5
A few drink stations on a 5.4 km (3.4 mi) run. Racers say little else about aid. · Low confidence
- Run sceneryBeautiful4.2
Two laps around the main lake in the palace grounds, finishing near the palace. · Medium confidence
- Run conditionsModerate3.3
Mixed surface, repeated laps and wet weather in recent years. · Low confidence
Course traits, not part of the score
- Run flatnessRolling2.8
A long uphill fills about a third of each 2.7 km (1.7 mi) lap, plus a footbridge climb. · Low confidence
Conditions
Air temperature, how predictable the weather is, setting, and spectating. Counts for 13% of the overall score.
- Air temperaturePleasant3.7
Early June is mild, roughly 11 to 21 °C (52 to 70 °F) by regional norms, but recent editions were wet. · Low confidence
- Weather reliabilityVariable2.9
Thunder and rain in 2025 and a wet, windy 2026 show a British June can turn. · Medium confidence
- Venue beautyStunning4.8
World Heritage palace grounds with a lake and bridge; transition sits in the palace courtyard. · High confidence
- Spectator friendlyEasy4.1
Three bike laps and two run laps in the grounds, with a palace finish. Spectators must book access tickets in advance. · Medium confidence
Course traits, not part of the score
- Low altitudeSea level4.9
About 100 m (330 ft) above sea level. · High confidence
Stay and travel
Hotels, walkability, getting there, and the town around the race. Counts for 10% of the overall score.
- Hotel availabilityBook early3.3
Woodstock is small and race weekend books early. Oxford is 13 km (8 mi) away. · Low confidence
- Hotel valueNormal3.1
No price reports found. Expect tourist-town rates on a busy race weekend. · Low confidence
- WalkabilitySome driving3.3
Lake, courtyard transition and finish are close together, but a long steep run links the swim exit and transition. · Medium confidence
- Travel easeEasy3.9
Heathrow is 90 km (56 mi) away. Oxford Parkway station and the S3 bus, about every 30 minutes, reach Woodstock. · Medium confidence
- LogisticsSimple3.7
One courtyard transition and free competitor parking. Multiple waves and spectator tickets add steps. · Medium confidence
- Town and foodGood3.6
Woodstock is a pretty small town. No race-specific food reports. · Low confidence
Key facts
- Location
- Woodstock, Oxfordshire, United Kingdom
- Typical month
- June
- Latest or next date
- 5 June 2027
- Organiser
- Independent (Supertri Blenheim)
- Field size
- About 2,500 athletes
- First held
- 2005
- Distances (non-standard)
- 0.8 km (0.5 mi) swim, 19.8 km (12.3 mi) bike, 5.4 km (3.4 mi) run
- Swim venue
- Blenheim Palace lake (lake)
- Wetsuit
- Mandatory
- Swim start
- wave (mass deep-water start per wave)
- Swim laps
- 1
- Bike laps
- 3
- Key climbs
- Two decent climbs per lap (2013 report); Steep descent to a blind corner, slippery when wet (2026 report)
- Run laps
- 2
- Run shade
- partial tree cover
- Air temperature
- 11–21 °C (52–70 °F)
- Humidity
- moderate
- Altitude
- 100 m (330 ft)
- Nearest airport
- London Heathrow (LHR), 90 km (56 mi) away
- Where to stay
- Woodstock, Oxford
- Booking
- Woodstock is small. Oxford is about 13 km (8 mi) south. Train to Oxford Parkway, then S3 bus to Woodstock about every 30 minutes (organiser guide).
What racers and reviewers say
- Racecheck (Jonathan C.)Raced 2012 · aggregator · Positive
Rated the event highly. Wide lake swim with one turn and helpful marshals on the slippery exit. Scenic, multi-lap rolling bike where faster riders pass you. The run from the lake to transition is steep and long, so strip the wetsuit early. Safety briefing and crowd support were strong at the palace.
“A great event with fantastic support.”
- Racecheck (Andrianna C.)Raced 2014 · aggregator · Positive
Loved the palace grounds setting and the carpeted courtyard transition. The lake swim was easy with marshals at the exit; the barefoot run up the hill to transition was the toughest part. Bike scenic and undulating, run picturesque with good support. Event is pricey but worth it.
- Ben's Place blog (Sprint 2013)Raced 2013 · blog · Positive
First open-water sprint for this racer. The deep-water mass start was calmer than feared but sighting without lanes was harder. Three-lap bike with two decent climbs; a bus-damaged footbridge forced a dismount each lap, costing minutes. Pulling the wetsuit off on the run to transition was hard.
- Coach magazine (Nick Hutchings)Raced 2015 · article · Positive
Returning racer after four years. Calls the 19.8 km (12.3 mi) bike short, hilly and fast with winding wooded descents. The two-lap 5.67 km (3.5 mi) run has a long climb on each loop. Describes it as among the UK's best multisport races with a lively crowd.
- Alpkit blog (Matt Hammerton)Raced 2008 · blog · Positive
Early edition: 750 m (0.47 mi) swim starting in a busy 'washing machine', closed-road bike laps through the grounds, and a hot, hilly run. Transition was in the palace forecourt after a climb from the lake. About 5,500 racers over two days, one of the UK's biggest events then.
Show 5 more
- Mirror Writing (Allan Sutherland)Raced 2024 · blog · Positive
A couch-to-5K novice who swam breaststroke through choppy water and was jostled by Weekend Warriors. Found the three-lap 20 km (12.4 mi) bike hilly and the transition walk long and pebbly. Upbeat announcer and cheering family made it fun.
- Zone3 recap (various athletes)Raced 2025 · article · Positive
Athletes call the lake serene and the swim enjoyable, but warn of a steep hill between swim exit and transition. Bike is multi-lap with a mostly uphill first half, steep accelerations and tight turns. Rain and some thunder, yet praise for organisers and crowds. Wetsuit rental offered.
- UK Run ChatRaced 2025 · article · Positive
Race news for the 21st edition (7-8 June 2025): sprint doubled as British and English sprint championships and GB qualifier. Formats were super sprint, sprint, relay and Weekend Warrior; 509 running clubs took part and over GBP 130,000 was raised for charity. No weather or water detail.
- 220 Triathlon (Weekend Warriors, Supertri Blenheim)Raced 2026 · article · Positive
Newcomer did three sprints on one wet, windy day. Lake warmer than expected and a bit choppy with a calm start; steep climb out of the water. Bike traffic-free but slippery with a fast descent to a blind corner and a bumpy bridge. Marshals and crowds well placed; Supertri organisation praised.
- Blenheim Palace Triathlon organiser and event pagesRaced 2027 · aggregator · Mixed
Official listing of 2027 dates (5-6 June), distances and start times. Organiser guidance states wetsuits are compulsory and calls the event beginner friendly. Treated as facts only, not an opinion source.
Raced Blenheim Palace Triathlon? 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.
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