SLOVÉNIE · Carinthia (Koroška)
K24 Ultra-Trail 50km: 2,550 Metres of D+ Through Slovenia's Karawanken Alps
Informations clés
Distance
50 km
Date
Droit d’inscription
80 EUR
€ / km
€1.60
Slovenia’s cult ultra: steep climbs, rocky ridges, and the iconic 24-hour mountain challenge vibe.
K24 Ultra-Trail 50km traces 50 kilometres through the Karawanken mountains of Slovenia's Koroška (Carinthia) region, based out of the former mining town of Črna na Koroškem. With 2,550m of D+ — officially confirmed on the race website at 51m per kilometre — the course ranks 94th most mountainous out of 390 European ultras: only 93 races carry more mountainous terrain. The biggest single descent drops 645m at an average gradient of −8.74%, ranking 92nd most dramatic in the database. Public transport is limited and accommodation in Črna books quickly — a car and advance planning are both essential. Entry is uncomplicated: €80 for 2026 with no hidden fees, and the race has no sell-out history at this distance. First staged in 2019, the K24 is a cult fixture in the Slovenian mountain running calendar, listed on ITRA and drawing runners to one of the least-touristed mountain corners of the Eastern Alps. Three airport options — Ljubljana, Klagenfurt, Trieste — within 1–2.5 hours serve international access.
Élévation et Terrain
Mètres totaux
2,550m
D+/KM
51.0m/km
Pour référence, le Tor des Géants 330 km a 73 D+/km.
Pente montante moyenne
14.3%
Pente descendante moyenne
-12.6%
Distribution du gradient de montée
| 2–5% | 4.6 km | |
|---|---|---|
| 5–10% | 3.9 km | |
| 10–15% | 3.6 km | |
| 15–20% | 2.3 km | |
| 20%+ | 4.8 km |
Profil de parcours
AnalysedDétail du terrain
| 40.2% | Montée |
|---|---|
| 14.4% | Plat |
| 45.4% | Descente |
Terrain
Ascensions
Principales montées
| Rank | Length | Elevation gain | Start km | Average gradient | Max gradient |
|---|---|---|---|---|---|
| 1 | 3.6 km · 645 m gain starts km 29 · avg 17.9% · max 48.1% | ||||
| 2 | 3.9 km · 591 m gain starts km 0 · avg 15% · max 52.2% | ||||
| 3 | 5.8 km · 504 m gain starts km 6 · avg 8.8% · max 33.3% |
Principales descentes
| Rank | Length | Elevation drop | Start km | Average gradient | Max gradient |
|---|---|---|---|---|---|
| 1 | 9.2 km · 1111 m drop starts km 33 · avg -12.1% · max -70.1% | ||||
| 2 | 4.7 km · 409 m drop starts km 14 · avg -8.7% · max -43.1% | ||||
| 3 | 2.9 km · 361 m drop starts km 44 · avg -12% · max -48.2% |
K24 Ultra-Trail 50km: 2,550 Metres of D+ Through Slovenia's Karawanken Alps
K24 Ultra-Trail 50km Elevation Gain and Course Profile▼
Q: How much elevation gain does the K24 Ultra-Trail 50km have? A: The official race website confirms 2,550 meters of elevation gain over a 50km distance, averaging 51 meters of climbing per kilometer, a figure verified by exact GPX data matching. The course ranks 94th most mountainous out of 390 European ultras and 139th in vertical density. The GPX file measures the course slightly shorter at 47.79km, the official 2,550m in elevation gain is official and used for all rankings.
Getting to Črna na Koroškem: Airports, Logistics, and Why You Need a Car▼
Q: Where is K24 Ultra-Trail and how do I get there? A: K24 Ultra-Trail is based in Črna na Koroškem, a small town in Slovenia's Koroška (Carinthia) region. Public transport is limited — a car is strongly recommended. The three nearest airports are Ljubljana (LJU), Klagenfurt (KLU, Austria), and Trieste (TRS, Italy), all approximately 1–2.5 hours away. Accommodation in Črna is limited; book early, and consider Slovenj Gradec (~25km) as an alternative base.
The Route: Climbs, Descents, and the Terrain of the Koroška Karawanken▼
Q: How hard is K24 Ultra-Trail 50km? A: Very hard by the data. The course ranks 94th most mountainous out of 390 European ultras. The biggest single descent drops 645m at an average gradient of −8.74%. Average uphill gradient ranks 107th steepest. With only 15% flat terrain and 2,550m of elevation gain in 50km, this is a technically demanding alpine race — not a beginner ultra. The course demands both uphill endurance and technical downhill skill.
Entry, Cost, and the K24 Story: Slovenia's Cult Mountain Ultra Since 2019▼
Q: Is K24 Ultra-Trail 50km sold out? A: No — the K24 50km has no sell-out history at this distance. Entry for 2026 is €80 (January 1 to May 31, 2026) with no hidden administrative fees. Registration is via https://k24trail.si/en/proge/k24-trail-50km-en/. The race is ITRA certified and first held in 2019. Both entry tiers for 2026 may be expired as of race week (August 2026) — verify current registration status directly with the organiser. For 2026, early bird fee is at €70 (October 1, 2025-December 31, 2025), regular prices at €80 (January 1, 2026-May 31 2026), last minute registration fee €90 (June 1, 2026-July 31, 2026).
Fichiers de course
Logistique
Aéroport le plus proche
Ljubljana (LJU) / Klagenfurt (KLU) / Trieste (TRS)
Notes
Start: ~1.0–2.5 hrs to Črna na Koroškem area / Public transport: limited; buses to Slovenj Gradec/Ravne + taxi last-mile; car recommended / Accommodation: limited in Črna; book early; alternative base in Slovenj Gradec
