Chateau de Chantilly Triathlon (Castle Series)
Chantilly, France · June · Independent (Castle Race Series)
Why people love it
- Race beside the Chateau de Chantilly, with a finish in the estate grounds.
- Sprint run is two shaded 2.5 km (1.6 mi) loops in woods and parkland.
- Starter, super sprint and sprint formats suit newcomers; 61% of reviewers call it beginner friendly.
- Paris CDG airport is 35 km (22 mi) away, and the train from Paris takes about 25 minutes.
- Forest bike course is mostly flat, according to reviewers.
Watch out for
- Canal water had algae and poor visibility in 2026, with a slippery exit.
- About 1 km (0.6 mi) of gravel at each end of the bike caused punctures.
- Narrow run paths crowd when several events overlap.
- Race-day instructions changed at short notice in 2026.
- Olympic bike length is listed as 40 to 45 km (25 to 28 mi), so check the guide.
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 satisfactionLoved3.7
656 Racecheck ratings average 4.20, but 2026 reviews split between raves and complaints about algae, gravel and communication. · High confidence
- OrganizationWell run3.7
Staff and bike check-in drew praise, but riders complained about race-day communication and hazards at the bike finish. · Medium confidence
- First timer friendlyFriendly4.1
750 m (0.47 mi) swim in waves, starter and super sprint options and 61% beginner share. · Medium confidence
Course traits, not part of the score
- PR potentialFast3.5
20 km (12.4 mi) flat bike and 5 km (3.1 mi) shaded run. · Low confidence
Swim
Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 16% of the overall score.
- Wetsuit legalUsually4.2
French and World Triathlon rule bans wetsuits above 24.6 °C (76.3 °F). Reviewers call the water cold, so wetsuits are likely legal. · Medium confidence
- Water temperatureAcceptable3.1
No temperature published; reviewers describe cold water in 2026 and a cold mass start, likely 16 to 19 °C (61 to 66 °F). · Low confidence
- Calm waterMostly calm4.3
Sheltered ornamental canal about 2.5 km (1.6 mi) long with no current or swell reported. · Medium confidence
- Swim easeEasy3.6
750 m (0.47 mi) in waves. · Low confidence
- Swim experienceFine2.5
Water quality 2.98/5 on Racecheck, the lowest category; algae, smell, murk and a slippery exit; organisers weeded the lake before 2026. · Medium confidence
- Swim supportGood3.7
Wave starts, lifeguards and junior races; 2026 reviewers still found the cold mass start of the half unsettling. · Medium confidence
Bike
Road surface, closures, scenery and wind. Counts for 18% of the overall score.
- Road surfaceMixed2.6
About 1 km (0.6 mi) of gravel at both transition ends with punctures and lost bottles, plus potholes, drain covers and rough strips. · Medium confidence
- Road closuresMostly closed3.7
Gendarmes and marshals at junctions praised; one reviewer was held up by slower cars, so not fully closed. · Low confidence
- Bike sceneryBeautiful3.8
Forest of Chantilly and horse-riding tracks. · Low confidence
- WindSome wind3.4
Forest gives shelter; one reviewer called the rest windy. · Low confidence
Course traits, not part of the score
- Bike speedFast3.7
Fast roads, gravel ends. · Low confidence
- Bike flatnessMostly flat3.9
Elevation unpublished; reported flat. · Low confidence
- Bike simplicitySome technical parts3.4
One reviewer called the rest technical; a roundabout sign was missing in 2026. · Low confidence
Run
Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.
- Crowd supportStrong3.6
Large festival atmosphere (73% of reviews); finish by the chateau. · Low confidence
- Aid stationsStandard3.4
One 2026 reviewer found too long a gap between aid stations; the final feed was praised; toilets limited on the course. · Low confidence
- Run sceneryBeautiful4.2
Woodland, racecourse and chateau gardens. · Medium confidence
- Run conditionsEasy3.6
Shade helps; paths shared with other events. · Low confidence
Course traits, not part of the score
- Run flatnessMostly flat3.9
Two flat 2.5 km (1.6 mi) loops. · Low confidence
Conditions
Air temperature, how predictable the weather is, setting, and spectating. Counts for 13% of the overall score.
- Air temperaturePleasant3.9
Typical June highs 18 to 25 °C (64 to 77 °F); 2026 Sunday was hot. · Medium confidence
- Weather reliabilityVariable3.4
Saturday 2026 brought three seasons in a day; 2025 sunny all weekend. · Low confidence
- Venue beautyStunning4.8
Every reviewer praises the chateau setting, even the unhappy ones. · High confidence
- Spectator friendlyEasy3.8
Large festival with the finish at the chateau; compact estate. · Low confidence
Course traits, not part of the score
- Low altitudeSea level5.0
About 40 m (130 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 early3.2
Small town with close to 7,000 competitors (2026); Paris and Senlis are the overflow. · Low confidence
- Hotel valueNormal3.2
No pricing data found; resort-style town in peak weekend. · Low confidence
- WalkabilitySome driving3.3
Estate venue, but kids' bike park is far from the swim exit and the chateau stairs add walking, per a 2026 reviewer. · Low confidence
- Travel easeEasy4.0
CDG 35 km (22 mi) and Paris Gare du Nord train about 25 min (50 km (31.1 mi) / 31 mi). · Medium confidence
- LogisticsSome complexity3.4
One estate and an efficient bike park, but several overlapping events and inconsistent race-day communication in 2026. · Low confidence
- Town and foodGood4.0
Historic town with cafes and the Chateau's attractions; no first-hand data in reviews. · Low confidence
Key facts
- Location
- Chantilly, Hauts-de-France, France
- Typical month
- June
- Latest or next date
- 12 June 2027
- Organiser
- Independent (Castle Race Series)
- Field size
- About 700 athletes
- First held
- 2010
- Distances
- 0.8 km (0.5 mi) swim, 20 km (12.4 mi) bike, 5 km (3.1 mi) run
- Swim venue
- Grand Canal, Chateau de Chantilly estate (about 2.5 km / 1.6 mi long still canal) (lake)
- Wetsuit
- Legal
- Swim start
- wave
- Run laps
- 2
- Run shade
- mostly shaded woodland and parkland
- Air temperature
- 14–25 °C (57–77 °F)
- Humidity
- moderate
- Altitude
- 40 m (130 ft)
- Nearest airport
- Paris Charles de Gaulle (CDG), 35 km (22 mi) away
- Where to stay
- Chantilly, Senlis
- Booking
- Day trip from Paris or Senlis is common; Chantilly station is about 25 min (50 km / 31 mi) from Paris Gare du Nord. Race weekend fills hotels in a small town.
What racers and reviewers say
- Racecheck: Chateau de Chantilly Triathlon SeriesRaced 2026 · aggregator · Mixed
656 ratings, 4.20 average. Reviewers agree the venue is beautiful, staff and bike check-in are good, and the shaded run is welcome. The swim is the weak point: algae, murk, cold mass starts and a slippery exit. Gravel at the start and finish of the bike causes punctures. Communication on race day drew criticism. 61% call it ideal for beginners.
“a beautiful venue, but a very disappointing race experience”
- Castle Race Series: Chateau de Chantilly 2025 race reportRaced 2025 · article · Positive
Organiser recap of the 15th edition: more than 6,000 athletes, sunshine all weekend, Olympic in five waves with a record field and the debut of the iron-distance Bastion. Promotional, with no athlete quotes, swim temperature or problems.
“record number of starters”
- Castle Race Series: Chateau de Chantilly 2026 race reportRaced 2026 · article · Positive
Organiser recap: nearly 7,000 competitors, a wet and changeable Saturday and a hot Sunday. Sprint Plus ran 450 triathletes in four waves and Sprint plus Super Sprint about 700 more. No problems mentioned, which sits oddly beside the Racecheck complaints that month.
“three seasons in a single day”
Raced Chateau de Chantilly Triathlon (Castle Series)? Your notes on the course, conditions and logistics help the next athlete decide.
Sources
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