IRONMAN cutoff times, transition procedures, and equipment rules vary by event and season. Some races set separate swim, bike, and overall limits; others also use intermediate checkpoints, and an athlete can be stopped before the final cutoff. Use the current athlete guide for your race as the authority on timing, layout, and rules.
What are the IRONMAN cutoff times?
There is no single cutoff schedule that applies to every IRONMAN or IRONMAN 70.3. A race may set limits for the swim, the cumulative swim–T1–bike time, and the full event, as well as intermediate checkpoints. The guide may count time from an individual athlete’s start, a gun start, or another stated reference point. Check the basis printed for your event before calculating how much time you have.
These published examples show why you should not treat a cutoff from another race as a guarantee for yours:
| Event and distance | Swim limit | Swim, T1 and bike limit | Overall limit | Timing basis and caveats |
|---|---|---|---|---|
| IRONMAN 70.3 Alghero; race-week page checked in 2026, publication date not shown | 1 hour 10 minutes | 5 hours 30 minutes | 8 hours 30 minutes | The page presents these as event cutoffs; confirm the timing reference and checkpoints in the current athlete guide. IRONMAN Alghero cutoffs |
| IRONMAN Alghero full distance; race-week page checked in 2026, publication date not shown | 2 hours 20 minutes | 10 hours | 17 hours | The page presents these as event cutoffs; confirm the timing reference and checkpoints in the current athlete guide. IRONMAN Alghero cutoffs |
| IRONMAN Chattanooga full distance; 2024 athlete guide | Separate swim limit applies; exact value not stated in the cited information | Separate bike limit and intermediate bike checkpoints apply; exact values not stated in the cited information | 16 hours 30 minutes from the swim-start timing mat | The guide also lists intermediate run checkpoints and says transitions and aid-station stops count toward elapsed time. 2024 IRONMAN Chattanooga athlete guide |
For a 70.3-specific example of a different timing basis, the 2025 IRONMAN 70.3 Tours guide says its posted times are calculated from each athlete’s individual start time, not the gun start. Courses can also impose time-of-day checkpoints. Read the guide’s wording rather than assuming the clock starts when the first athlete begins.
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What happens if you miss an IRONMAN cutoff?
A cutoff or intermediate checkpoint can end your race even if the overall cutoff has not passed. The 2025 Tours guide says officials may remove an athlete when, based on the athlete’s location, time, and average speed, they determine that the athlete cannot finish the discipline before its posted cutoff. A race’s transition area may also close after a discipline cutoff; the timing and procedure are event-specific.
For example, the 2024 Chattanooga guide sets T1 closure at 20 minutes after the swim cutoff and T2 closure at 10 minutes after the bike cutoff. Those intervals are for Chattanooga’s cited guide, not a universal IRONMAN rule. The event guide also explains that cutoffs must be respected in light of road permits and athlete safety.
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What are T1 and T2?
- T1 is the transition from swim to bike.
- T2 is the transition from bike to run.
Transitions are part of the race schedule: where a guide sets cumulative swim–T1–bike or overall limits, transition time counts. Follow your event’s transition map, bag instructions, assigned locations, and timing rules rather than expecting the same layout at every race.
Example: the 2025 Tours transition procedure
The 2025 Tours guide describes athletes collecting a transition bag, changing, returning gear to the assigned bag location, taking the bike, and heading to the transition exit. It says the helmet chin strap must be fastened before riding and the athlete must not mount until past the marked line at the bike-park exit. Other events may use different procedures and layouts.
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Can you wear a wetsuit in an IRONMAN?
Wetsuit eligibility depends on the event’s conditions and applicable rules; do not assume that a wetsuit is permitted or required because it was allowed at another race. In its 2025 guide, IRONMAN 70.3 Tours says wetsuits may be worn at water temperatures up to and including 24.6°C and are mandatory below 16°C under that event’s stated rules. Check the current guide for your race and season for the applicable thresholds and swimwear requirements.
Which swim and bike equipment rules should you check?
The 2025 Tours guide allows swim goggles or facemasks, but prohibits fins, gloves, paddles, flotation devices such as pull buoys, and snorkels. It also says athletes must not wear a race bib during the swim. These are event-guide examples, not a substitute for checking the rules that govern your event.
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For the bike, the same guide requires the helmet chin strap to be closed before riding and prohibits mounting before the marked line. Consult the current competition rules and event guide for any further equipment specifications that apply to your race.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What happens to an IRONMAN relay team if a member misses a cutoff?
The IRONMAN 70.3 Nice FAQ says relay teammates exchange the timing chip in the relay zone and follow the same cutoffs as individual athletes. It also says that if a relay member misses the swim or bike cutoff, the entire team is recorded as DNF and may not continue. Confirm the current relay instructions for your event, since this is guidance from the Nice FAQ.
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Where should you verify the rules for your race?
- Find the current athlete guide for your event and season. Use its schedule for discipline cutoffs, cumulative clocks, intermediate checkpoints, transition closures, and the clock’s starting reference.
- Read the transition and relay instructions. Check the map, bag process, assigned locations, mount line, and any team-specific timing-chip procedure.
- Check swim conditions and equipment requirements. Confirm wetsuit eligibility and restrictions for swim aids, bibs, helmets, and other gear in the guide and applicable competition rules.
- Use the current IRONMAN Competition Rules for rule details. IRONMAN says the 2026 rules take effect for events after March 2, 2026. Its rules page identifies updates concerning professional-athlete bike draft zones, equipment specifications, and Para Open Division terminology; consult the full rules, modifications summary, and FAQs for the exact provisions rather than inferring details from a summary. IRONMAN Competition Rules
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