iau-ultramarathon.org

What is the International Association of Ultrarunners (IAU)?

The International Association of Ultrarunners (IAU) is the international governing body for ultradistance running. It describes its main role as promoting and developing long-distance running, and it organizes and sanctions championships across the sport's main formats, including trail, 24-hour, 50 km and 100 km events. Its site also carries official announcements, such as the news that Croatia will host the 2027 IAU 100 km European Championships.

Who it matters to

• Runners aiming at national or international competition, who look to the IAU for the official championship calendar and event standards.
• National federations and race organizers, who need the governing framework for sanctioned ultradistance events.
• Coaches and supporters tracking which distances and formats have official championships.

How to use it

If you are planning a season around a specific format, start with the format headings (Trail, 24 H, 50 K, 100 K) to see which championships exist and where they are announced, then check your national federation for entry paths and qualifying requirements, since the IAU sets the international level rather than handling individual entries.

How can I find an IAU-certified ultramarathon race near me?

The IAU itself does not publish a searchable "certified races near me" directory on its home page. What the site does show is how the organisation frames the sport: it presents itself as the international governing body for ultradistance running and organises its content by discipline — Trail, 24 H, 50 K, 100 K and IAU Ultramarathon — with news items such as championship host announcements (for example, Croatia hosting the 2027 IAU 100 km European Championships). So the practical route is to work from IAU championship and labelled-race information outward to national bodies, rather than expecting a postcode search.

A workable search sequence

1. Start with the IAU site by discipline. Check the Trail, 24 H, 50 K and 100 K sections for the championship calendar and any race-labelling information. This tells you which events carry IAU recognition, but not which ones are close to you.
2. Go to your national athletics federation or national ultrarunning association. IAU recognition flows through national member federations, and those bodies usually list domestically labelled or championship-qualifying races with dates and locations. This is where "near me" actually gets answered.
3. Confirm the label with the race organiser. Ask directly whether the event is IAU-labelled or a championship qualifier, and for which year — labels and host decisions change, as the 2027 Croatia announcement illustrates.
4. Match the discipline to your goal. A 50 K road race, a 24-hour track event and a mountain trail ultra have very different entry requirements, qualifying standards and support structures. Decide which discipline you are targeting before shortlisting.

Where to look beyond the IAU

IAU – International Association of Ultrarunners is the right starting point for what counts as an IAU-recognised event; World Athletics is useful for understanding how national federations are structured, since your federation is the bridge to local races.

A concrete example: if you want a 100 km road race in your region, check the IAU 100 K section for the championship and label framework, then ask your national federation which domestic 100 km races hold that status this season, then email the organiser of the nearest candidate to confirm. That three-step chain is more reliable than any single listing, because recognition is granted to specific events for specific years.

What are the official IAU race distances and categories, such as 50K, 100K, 24H, and trail?

The IAU's official ultradistance categories are 50 K, 100 K, 24 H and trail, as listed in the site's main navigation. In practice these are the four families under which the association labels and promotes ultramarathon competition, rather than a single ladder of distances.

How the categories differ in use

The distinction that matters most is fixed distance versus fixed time. A 50 K or 100 K runner knows the target; a 24 H runner paces against the clock and stops when it expires. Trail sits apart again, because the course profile and surface shape performance more than a precise distance does.

A useful next step

If you are choosing where to start, pick the category that matches how you prefer to measure effort: a set distance (50 K, then 100 K) if you like a defined finish, or 24 H if you prefer racing the clock. Then check the IAU site's own category pages, which sit under the headings above, for the events and championships attached to each.

The page's news item — Croatia hosting the 2027 IAU 100 km European Championships — illustrates the pattern: the IAU's championship calendar is organised by these categories, so following one category's page is the simplest way to track relevant races.

How do I qualify to represent my country at an IAU World or European Championship?

Qualification is run through your national federation, not by applying to the IAU directly. The IAU sets the championship and the entry rules; each member federation selects and enters its own athletes. So the practical answer is: meet your federation's selection standard, then get entered by them before their deadline.

What the IAU page tells you, and what it doesn't

The page confirms the championship structure you'd be targeting: separate Trail, 24 H, 50 K and 100 K disciplines, and it shows the IAU awarding host duties well ahead of time — for example, Croatia hosting the 2027 IAU 100 km European Championships, announced in October 2026. That lead time matters for planning: a championship two or three years out is already on the calendar, so you can build a qualifying window around it. The page does not publish athlete entry criteria, so treat the federation as your source for standards.

How selection usually works

Most federations use a mix of the following. Confirm which apply to you rather than assuming.

• A qualifying performance at a specified distance within a set window, often at a listed trial race or a sanctioned event.
• A ranking or quota system, where a limited number of places go to the fastest eligible entrants.
• Automatic entry for defending medalists or athletes above a federation-set benchmark.
• Membership and eligibility conditions, including nationality or residency rules and clean-sport requirements.

A concrete scenario

Suppose you run the 100 km and want the 2027 European Championships. Work backwards: ask your federation for the selection policy document, note the qualifying window and trial date, and check whether it ranks entrants or holds a single trial. If it ranks, your target time needs to beat recent selected athletes, not just a nominal standard. Then plan one or two attempts inside the window, allowing recovery time between them.

Where to look next

Start with your national federation's ultrarunning or championships page — it will carry the selection policy and nomination deadline. For the international calendar and discipline structure, the governing body's own site is the reference: IAU – International Association of Ultrarunners. If your country's federation is slow to publish, check the host federation's event page for entry logistics, since organisers usually list which bodies submit entries.

Decision criteria

• If your federation publishes a policy: follow its window and deadline exactly; late nominations are rarely accepted.
• If it runs a trial: treat that race as your priority and taper for it.
• If selection is ranking-based: compare your recent times with the last two or three selected teams.
• If you hold no qualifying mark yet: pick a sanctioned race far enough out to allow a second attempt.

Where can I access official IAU race results and world records?

Official IAU race results and world records are published on the association's own site, IAU – International Association of Ultrarunners. The homepage is the governing body's hub for ultradistance running and links into its discipline sections—Trail, 24 H, 50 K and 100 K—which is where event results and record information sit.

How to use it

• Start from the discipline that matches the race format: a 100 km road result is filed under 100 K, a timed event under 24 H.
• Look for the results or records section within that discipline rather than expecting a single combined database on the homepage.
• For championship events, check the news items too; announcements such as the 2027 IAU 100 km European Championships being awarded to Croatia show how the site pairs event news with its results archive.

Practical example

A runner who finished a national 24-hour championship wants to know how their distance compares internationally. They would open the 24 H section, find the relevant event results, then cross-check the world record listing for that discipline—rather than searching the whole site, which mixes road, trail and timed formats.

Decision criterion

If you need an official, governing-body figure—for record ratification or entry standards—use the IAU site. For live splits during a race or historical results across many races in one place, national federation sites and dedicated results services are usually quicker, but treat the IAU as the authority when the distinction matters.

What does hosting an IAU championship event require for a national federation or local organizer?

The page evidence on IAU's site does not spell out a bid or hosting checklist, so the requirements below are general advice for federations and local organizers rather than a published IAU rulebook. The one concrete signal is that IAU awards championships to specific hosts—for example, the site announces that Croatia will host the 2027 IAU 100 km European Championships—which means hosting is granted through a selection process rather than simply declared.

What hosting typically involves

• Federation backing. IAU is a governing body working through national federations, so a credible bid usually comes from or with the formal support of the national federation, not a local club alone.
• A certified course. For road events such as 100 km and 50 K, expect to need a measured, certified route and a technical plan for timing, aid stations and medical cover.
• Officials and referees. International championships require qualified technical delegates and referees, often appointed by the governing body, plus local officials to support them.
• Team services. Hosts must handle entries, accreditation, team areas, transport and accommodation guidance for visiting national teams.
• Medical and anti-doping readiness. Ultradistance events carry specific medical risks; a serious host plans medical protocols and anti-doping procedures in advance.
• Budget and risk. Venue, timing equipment, insurance, volunteers and contingency funds are the usual pressure points; a realistic budget and local authority permits matter as much as the course itself.

A useful next step

Before drafting anything, contact your national federation and ask for the IAU's current bid documents and technical requirements for the specific discipline (trail, 24-hour, 50 K or 100 K), since criteria differ by event type. Build your proposal around course certification, medical planning and team logistics first—those are the areas that most often decide whether a bid is taken seriously.