IRONMAN Chattanooga
Chattanooga, USA · September · IRONMAN
Why people love it
- Fast downstream river swim through the city
- Riverwalk and bridge run in a walkable downtown
- Strong local support and a vibrant riverfront
- Host of the 2027 IRONMAN 70.3 World Championship
Watch out for
- Swim cancelled when river flow is high (2018 full)
- Hilly bike (about 1,310 m (4,300 ft) / 4,300 ft of gain) and a bridge-climbing run (335 m (1,100 ft) / 1,100 ft)
- Heat and humidity can be severe: 36 °C (97 °F) in 2016, about 40% DNF per one report
- Course changes in 2024 and 2025 (US-27 highway bike, new run route)
- Non-wetsuit swim possible: water 24-26 °C (75-79 °F) vs a 24.5 °C (76.1 °F) limit
Race
How racers feel about it, how well it is run, and how it treats a first timer. Counts for 27% of the overall score.
- Racer satisfactionLoved3.8
Few recent full-distance reviews. The city, venue and community are praised; the hard bike and run, heat and swim-cancellation risk hold it back. · Low confidence
- OrganizationWell run3.8
Well-run venue, but the full swim was cancelled in 2018, a wrong T1 bag was handed out and courses changed in 2024 and 2025. · Low confidence
- First timer friendlyDoable2.8
A fast swim helps, but 1,310 m (4,300 ft) of bike gain, run bridge climbs and heat make it hard; roughly 40% DNF in 2016. · Low confidence
Course traits, not part of the score
- PR potentialAverage3.2
A current-assisted swim and a 10:01 finisher PB in 2025, but 1,310 m (4,300 ft) of bike gain and run bridge climbs slow most athletes. · Medium confidence
- Course easeVery tough2.4
About 1,310 m (4,300 ft) of bike gain plus 335 m (1,100 ft) on the run, with heat and humidity. A 2023 racer: 'hard'. · Medium confidence
Swim
Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 15% of the overall score.
- Wetsuit legalSeldom2.4
Water is typically 24-26 °C (75-79 °F), straddling the 24.5 °C (76.1 °F) limit. Wetsuits were banned in 2025 but allowed in 2023. · Medium confidence
- Water temperatureAcceptable3.1
24-26 °C (75-79 °F) is warm but not hot. · Medium confidence
- Calm waterMostly calm3.9
A river with strong downstream current and little chop, but high flow can cancel the swim. · Medium confidence
- Swim easeEasy4.4
Current-assisted, fast and uncrowded per 2023 and 2025 racers. One 70.3 racer found the current imperceptible in 2023. · Medium confidence
- Swim experienceGreat3.9
A downstream point-to-point swim through the city, praised by racers. Cancellation risk when river flow is high. · Medium confidence
Bike
Road surface, closures, scenery and wind. Counts for 19% of the overall score.
- Road surfaceGood3.5
Good roads reported on the older Georgia course. Few details on the US-27 highway. · Low confidence
- Road closuresMostly closed4.0
Large closures including a dedicated lane on US-27. No incident reports found. · Low confidence
- Bike sceneryPleasant3.1
North Georgia countryside on older courses. The US-27 highway loops are less scenic. · Low confidence
- WindSome wind3.0
The headwind reversed from the prior year and was stronger outbound in 2025. · Low confidence
Course traits, not part of the score
- Bike speedAverage3.1
A rolling three-loop highway course with an extra-long hill before loops two and three. A 10:01 finisher biked 5:10 in 2025. · Medium confidence
- Bike flatnessRolling3.1
About 1,310 m (4,300 ft) per the 2024 course announcement. A 1,714 m (5,623 ft) figure in finisher listings is unverified. · Low confidence
- Bike simplicityMostly simple3.5
Highway loops are straightforward. Lookout Mountain descents applied only to the old course. · Low confidence
Run
Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.
- Crowd supportStrong3.8
Crowd and volunteer support praised in 2025 and the run crosses busy bridges. A 2023 racer found the swim and early run quiet. · Low confidence
- Aid stationsGood4.0
Aid and cola praised. One 2025 racer walked the aid stations. · Low confidence
- Run sceneryBeautiful4.1
The Riverwalk, Veterans Bridge, the Aquarium and downtown. · Medium confidence
- Run conditionsModerate2.6
Hills plus heat and humidity: 27 °C (81 °F)+ (80+ °F) in 2025, 36 °C (97 °F) in 2016. One racer found the last 20 km (12.4 mi) 'relentless'. · Medium confidence
Course traits, not part of the score
- Run flatnessRolling3.1
335 m (1,100 ft) over two loops, with steep Veterans Bridge and North Shore climbs. · Medium confidence
Conditions
Air temperature, how predictable the weather is, setting, and spectating. Counts for 15% of the overall score.
- Air temperatureWarm or cool2.8
Late September: 27 °C (81 °F)+ (80+ °F) in 2025, 36 °C (97 °F) in 2016, mild in 2023. Humid. · Medium confidence
- Weather reliabilityVariable2.7
The 2018 swim was cancelled for high river flow, and heat ranges from mild to extreme. · Low confidence
- Venue beautyLovely4.1
Riverfront, bridges and surrounding mountains. · Medium confidence
- Spectator friendlyEasy3.9
A compact downtown with a free electric shuttle and bike share. Long gaps between swim and run for spectators. · Medium confidence
Course traits, not part of the score
- Low altitudeLow4.4
A valley city at roughly 200 m (660 ft). No altitude effect expected. · Medium confidence
Stay and travel
Hotels, walkability, getting there, and the town around the race. Counts for 11% of the overall score.
- Hotel availabilityGood3.9
A large city with many hotels. No race-week sell-out data found. · Low confidence
- Hotel valueGood3.5
No pricing data found. · Low confidence
- WalkabilityWalkable3.8
Downtown hotels are near Ross's Landing, but the point-to-point swim needs a T1 bus around 6:20 a.m. · Low confidence
- Travel easeOne connection3.0
Chattanooga airport (CHA) is small. Most fly into Atlanta, about 190 km (118 mi) and 2 hours away. · Low confidence
- LogisticsSome complexity2.9
A bus to T1 and a point-to-point swim, though a city shuttle is available. · Medium confidence
- Town and foodGood4.4
A walkable riverfront with restaurants, coffee, breweries and a vibrant downtown. · Medium confidence
Key facts
- Location
- Chattanooga, Tennessee, USA
- Typical month
- September
- Latest or next date
- 27 September 2026
- Organiser
- IRONMAN
- Field size
- About 1,600 athletes
- First held
- 2014
- Distances
- 3.8 km (2.4 mi) swim, 180 km (112 mi) bike, 42.2 km (26.2 mi) run
- Swim venue
- Tennessee River, point-to-point ending at Ross's Landing (river)
- Water temperature
- 24–26 °C (75–79 °F)
- Wetsuit
- Optional (non-wetsuit call at 76 F in 2025; wetsuits allowed in 2023)
- Swim start
- rolling
- Swim laps
- 1
- Bike climbing
- 1,714 m (5,620 ft)
- Bike laps
- 3
- Key climbs
- Extra-long hill before loops two and three (2025 course)
- Run climbing
- 335 m (1,100 ft)
- Run laps
- 2
- Run shade
- Limited; large exposed portions along the river
- Humidity
- Humid; 80+ F run in 2025; 97 F in 2016
- Nearest airport
- Chattanooga Metropolitan (CHA); Atlanta (ATL) used by many
- Where to stay
- Downtown / Riverfront, North Shore, Bluff View
- Booking
- Large city with many hotels; Airbnb about half a mile from start used in 2025. Shuttle buses carry athletes to T1.
What racers and reviewers say
- CyclizingRaced 2023 · blog · Positive
Sixth full IRONMAN. Fast uncrowded wetsuit river swim under 50 minutes, mostly rolling bike through Georgia countryside, comfortable temperatures, quiet early run that faded as fatigue grew. Gels every 20 minutes and cola after mile 13 worked fine.
“IRONMAN is hard! That's my takeaway from this race.”
- Trimarni blogRaced 2025 · blog · Positive
2025 PB of 10:01 after a non-wetsuit current-assisted swim in 24 °C (76 °F) water, a new three-loop highway bike with rolling hills and an extra long climb before loops two and three, and a hot (27 °C (81 °F)+ / 80+ °F), windy run with strong crowd and volunteer support. Rented a house 0.8 km (0.5 mi) from the start; bus to T1.
- Medium (Bruno Sanchez-Andrade Nuno)Raced 2016 · blog · Negative
Reported from a search snippet (page returned 403). Record 36 °C (97 °F) course heat; roughly 40% of 2,716 registrants did not finish, double the previous year; finished in 15:20, about 2 h over goal. Year inferred as 2016.
- Triathlon Magazine CanadaRaced 2018 · blog · Mixed
Swim was cancelled and became a time-trial bike start. Author describes a tough race with a relentless final 20 km (12 mi) of running, thanked the volunteers and city, and took away nutrition and pacing lessons.
- NewsChannel 9 (WTVC)Raced 2025 · article · Mixed
2025 preview: TVA monitoring river flow, athletes still worried about a swim cancellation earlier in the year, bike moved to US-27 through Red Bank/Soddy-Daisy, and run rerouted over Veterans Bridge instead of Frazier Ave/Walnut Street Bridge.
Show 5 more
- Slowtwitch forum: Chattanooga for 70.3 Worlds 2027Raced 2017 · forum · Mixed
Forum thread (June 2026, 70.3-focused). Posters say bike and run are hard (a final climb of about 5 km (3 mi), steep bridge climbs), swim is easy when current-assisted, heat/humidity is a concern for some but 2017 was mild, and travel is workable via Atlanta though the airport transfer is long.
- Slowtwitch interview (70.3 Worlds 2017)Raced 2017 · article · Positive
70.3 World Championship story: age-grouper praised the swim course and venue, called the course beautiful and honest, the city charming and locals generous, despite a flat on Lookout Mountain.
“beautiful and honest”
- TriRating (2014 results analysis)Raced 2014 · aggregator · Positive
Page returned 429 when fetched; reported from search snippet: strong river current in the inaugural 2014 full produced fast swim times and records.
- Visit Chattanooga spectator guide (70.3 era)article · Positive
Official tourism guide written for the 70.3 format: spectating spots along the Riverwalk and bridges, bike-share and restaurants near the course, and a dramatic finish line at Ross's Landing. No hotel advice given.
- Journey to 140 (70.3 Chattanooga)Raced 2023 · blog · Mixed
70.3 report: the downriver swim felt great in temperature and the current was imperceptible. Reported from search snippet; shows the current effect varies year to year.
Sources
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