IRONMAN 70.3 Cozumel

Cozumel (San Miguel), Mexico · September · IRONMAN

IRONMAN 70.3 Cozumel: cyclist on the ironman 70.3 cozumel course in san miguelQwasert, CC BY-SA 4.0
Cyclist on the Ironman 70.3 Cozumel course in San Miguel. Photo via Wikimedia Commons.

Why people love it

  • Warm, clear Caribbean swim, 28 °C (82 °F), often with a helpful current
  • Flat, fast 90 km (56 mi) bike and a flat two-lap run
  • Strong local atmosphere along the waterfront and plaza
  • Fast winning times: 3:43:48 men and 4:13:46 women in 2022

Watch out for

  • Highs of 30 to 33 °C (86 to 91 °F) and high humidity make the run the crux
  • No wetsuit: swim skins only in 28 °C (82 °F) water
  • Wind on the exposed east side and slick roads in rain
  • Split transitions with bus logistics, and a bike flight via Cozumel or Cancun
  • September is hurricane season

Race

4.5Very good

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 satisfactionLoved4.2

    Few reviews, but racers rate production and scenery highly; heat is the main complaint. · Medium confidence

  • OrganizationWell run4.2

    Production rated highly, and buses moved thousands of athletes to the swim start smoothly; some rolling-start delays. · Medium confidence

  • First timer friendlyFriendly3.5

    Flat course and clear water, but heat of 30 to 33 °C (86 to 91 °F), a bike flight and split transitions add difficulty. · Low confidence

Course traits, not part of the score

  • PR potentialFast4.0

    Flat island loop with fast winners (3:43:48 men, 4:13:46 women in 2022) and a 2:05:21 pro bike, though heat and wind bite. · Medium confidence

  • Course easeModerate3.5

    Flat, but hot, humid and windy. · Medium confidence

Swim

2.4Below par

Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 15% of the overall score.

  • Wetsuit legalRarely1.0

    Water of 28 to 29 °C (82 to 84 °F) is above the legal limit; swim skins only. · High confidence

  • Water temperatureUncomfortable1.8

    At 28 to 29 °C (82 to 84 °F) the water is above the 27 °C (81 °F) hot threshold. · High confidence

  • Calm waterMostly calm3.5

    Open sea on the sheltered side of the island, but swell has pushed swimmers toward shore. · Medium confidence

  • Swim easeEasy4.0

    A helpful current gave very fast swims in 2022; the rolling start and three 90-degree turns add some contact. · Medium confidence

  • Swim experienceSuperb4.6

    Clear turquoise water over reef, described by one racer as second to none. · Medium confidence

Bike

3.2Good

Road surface, closures, scenery and wind. Counts for 19% of the overall score.

  • Road surfaceMixed3.3

    Potholes and painted-line hazards in wet 2018 conditions; otherwise paved island highway. · Low confidence

  • Road closuresMostly closed4.0

    The island highway is generally closed to traffic; little direct evidence. · Low confidence

  • Bike sceneryBeautiful3.6

    Coastal highway with sea views; little bike-specific detail. · Low confidence

  • WindSome wind2.8

    The east side of the island is windy, with head and cross winds over much of the loop. · Low confidence

Course traits, not part of the score

  • Bike speedFast4.1

    Flat 90 km (56 mi) with a 2:05:21 pro bike in 2017; wind and wet-road patches slow some years. · Medium confidence

  • Bike flatnessPancake flat4.9

    Almost completely flat, though no gain figure is published. · Medium confidence

  • Bike simplicityStraight and simple4.6

    Straight highway with a few turns through town; wet roads add risk. · Medium confidence

Run

3.7Very good

Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.

  • Crowd supportStrong3.8

    Residents cheer along the waterfront, plaza and neighbourhoods on the two-lap run. · Medium confidence

  • Aid stationsGood4.3

    Aid stations were praised as very clean, with ice and sponges that matter in the heat. · Medium confidence

  • Run sceneryBeautiful4.0

    Waterfront malecon, downtown plaza and historic streets. · Medium confidence

  • Run conditionsHard2.0

    Flat, but 30 to 33 °C (86 to 91 °F) and about 78% humidity; heat exhaustion is reported. · Medium confidence

Course traits, not part of the score

  • Run flatnessFlat4.8

    Flat paved two-lap run; no gain figure published. · Medium confidence

Conditions

2.1Below par

Air temperature, how predictable the weather is, setting, and spectating. Counts for 15% of the overall score.

  • Air temperatureHarsh1.5

    Highs of 30 to 33 °C (86 to 91 °F) with high humidity. · High confidence

  • Weather reliabilityVariable2.8

    September is hurricane season, with pre-race downpours in 2018 and occasional storms. · Medium confidence

  • Venue beautyStunning4.5

    Caribbean island with reefs, a seafront promenade and a historic centre. · Medium confidence

  • Spectator friendlyEasy3.7

    Run laps downtown are easy to watch, but the bike is spread over the island and transitions are split. · Low confidence

Course traits, not part of the score

  • Low altitudeSea level5.0

    Sea level, about 3 m (10 ft). · High confidence

Stay and travel

2.3Below par

Hotels, walkability, getting there, and the town around the race. Counts for 11% of the overall score.

  • Hotel availabilityBook early3.2

    The race has sold out and host hotels fill, though the island has plenty of resorts. · Low confidence

  • Hotel valueNormal2.8

    Resorts are pricey in race week, and taxis at about US$20 per ride add up. · Low confidence

  • WalkabilityMostly driving2.4

    T1 and T2 are far apart and host hotels sit far from the finish, so most use taxis and shuttles. · Medium confidence

  • Travel easeOne connection3.0

    Direct flights to Cozumel (CZM) exist; many fly into Cancun and take the ferry, and bike fees apply. · Medium confidence

  • LogisticsSome complexity2.5

    Bus to the swim start, T1 at Chankanaab and T2 downtown. · Medium confidence

  • Town and foodGood4.3

    San Miguel waterfront with plenty of restaurants and tourist infrastructure. · Medium confidence

Key facts

Location
Cozumel (San Miguel), Quintana Roo, Mexico
Typical month
September
Latest or next date
26 September 2027
Organiser
IRONMAN
Field size
About 2,500 athletes
First held
2012
Distances
1.9 km (1.2 mi) swim, 90 km (56 mi) bike, 21.1 km (13.1 mi) run
Swim venue
Caribbean Sea off Chankanaab Park (ocean)
Water temperature
28–29 °C (82–84 °F)
Wetsuit
Banned (water ~28 C / 82 F; swim skins only)
Swim start
rolling (self-seeded by projected swim time)
Swim laps
1
Bike laps
1.3
Run laps
2
Run shade
Mostly exposed; some shaded sections downtown
Air temperature
26–33 °C (79–91 °F)
Humidity
High
Altitude
3 m (10 ft)
Nearest airport
Cozumel International (CZM); many fly Cancun (CUN) + ferry
Where to stay
San Miguel town, Host hotels near Chankanaab
Booking
Host hotels offer shuttles to the swim start but sit far from the finish; Fiesta Americana is popular near town (~5 km / 3 mi from T2).

Official race website (ironman.com)

What racers and reviewers say

  • SlowtwitchRaced 2022 · article · Mixed

    Pro-race report: a helpful current produced very quick swim splits, then 32 C (89 F) heat on the run decided late duels. Taccone won in 3:43:48 and Frades in 4:13:46.

    “the fierce heat”

    Slowtwitch staff
  • SlowtwitchRaced 2017 · article · Mixed

    Winners posted 22:08 swim and 2:05:21 bike on a flat course (men), with a hot, humid day on the island; confirms the course is fast but heat is a factor.

    “the heat in this place is unreal”

    Slowtwitch staff
  • Michi Weiss blog (Miguel Blanco wins)Raced 2018 · blog · Mixed

    First-person account: 28 C (82 F) clear Caribbean water so swim skins, three 90-degree swim turns, near-flat bike on wet roads with potholes and painted-line hazards, and a punishing hot run. Windy side of the island gave fast sections.

  • RaceRavesRaced 2022 · aggregator · Positive

    Two reviews: 'Cozumel is easy' (2022) and 'Beautiful but painful' (2018), both praising production and scenery. Pros: clear water, flat bike and run, friendly locals; cons: heat, humidity, wind on the flat course.

    “Cozumel is easy”

    RaceRaves reviewers
  • RaceCheck (full IRONMAN Cozumel)Raced 2015 · aggregator · Positive

    Full-distance review, not 70.3-specific, but same venue and logistics: efficient check-in, buses moving ~2,700 athletes smoothly to the swim start, rolling start chaos, a swell pushing swimmers to shore, head/crosswinds on the bike and the 'cleanest aid stations'. Heat 32 C (90 F), ~78% humidity.

Show 3 more
  • Slowtwitch forum: Ironman Cozumel threadRaced 2025 · forum · Positive

    Participants praise the swim; one 70.3 racer was heat-exhausted afterwards. Travel advice: fly direct vs Cancun ferry, no car needed, taxis about US$20 (CZM airport staff confiscated some tools), host hotels are far from the finish, Fiesta Americana popular.

    “the swim is second to none”

    Multiple posters
  • Cozumel4YouRaced 2023 · article · Positive

    Local preview of the 2023 edition: over 1,500 athletes registered, T1 at Chankanaab, T2 by City Hall downtown, run along the waterfront and plaza; residents cheer athletes on and the race has sold out before.

  • Slowtwitch forum: Cozumel travel threadsRaced 2021 · forum · Mixed

    Full-distance racers discuss wind on the east side, equipment rules and getting a ferry from Cancun without a booking; suggests the ferry route works but airline baggage policies matter.

Sources

Pages we used for facts and ratings. See how we rate.

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