The 24-Hour Run
in Austria
Guides, rules and background on the 24-hour run and ultramarathon scene in Austria — from course measurement and aid stations to the Grimming360 archive in Irdning.
What is a 24-hour run?
The 24-hour run is a classic ultra-running discipline: on a measured loop course, individual runners try to cover as many kilometres as possible within 24 hours. The official result is the distance completed in full loops — residual metres from the incomplete final loop are measured separately.
In Austria, the 24-hour run in Irdning (Styria) was for many years a fixed entry in the national ultra-running calendar. It ran under the name Grimming360 and was regarded as one of the most atmospheric ultra-running events in the country. This site collects knowledge and background on the format — from the rule book and course design to nutrition strategies.
Knowledge around the ultra run
Race formats: 24h, 12h, 6h and relays
Which competition formats are typically offered at Austrian 24-hour runs — from solo entries to six-runner relays.
Loop, AIMS measurement and elevation
How a 24-hour course is measured, why short loops are standard, and what the elevation profile means for pacing.
Rules for participants
Eligibility, residual-distance measurement, the final siren and the wider rule set that is standard in the Austrian ultra scene.
Preparing for a 24-hour run
Weekly volume, sleep-deprivation simulation, core work and the mental tools that carry runners through the second half of the night.
Aid station and nutrition over 24 hours
What a typical Austrian ultra aid station offers, realistic per-hour calories, and the place of vegan strategies in this format.
How registration generally works
How chip timing and online entry typically work in the Austrian ultra-running scene — ÖLV nomination for championship status, early-bird tiers and day-of late entries.
With its singular atmosphere, the 24-hour run in Irdning was for years considered a highlight of the Austrian ultra-running calendar.
A framing of the event before its format change in 2019