Ultra-Trail Puseljc 103.8km: Slovenia's Hidden Alpine Gradient Monster, 6,520m D+ in the Baska Grapa Valley, and One of Europe's Most Demanding 100km Races With Almost No English Profile

Ultra-Trail Puseljc is among the most gradient-intensive 100km+ races in the DiscoverTrailRaces catalogue. The distance-weighted average uphill gradient is 15.72% (rank 54/~390 -- top 14% steepest in the database, UPPER tier). The average downhill is -15.17% (rank 320/~390 inverted -- near the steepest end of the database, 319 courses gentler). Only 12.7% of the course is flat (rank 75/~390 -- top 19% most mountainous). Approximately 12.83km runs above 20% gradient -- more distance is spent above 20% than in any individual lower band. The course is 42.8% uphill and 44.5% downhill: almost every kilometre is either climbing or descending at steep mountain gradient. This is not a course that tests endurance through distance alone; every kilometre demands technical mountain movement at extreme gradient, either up or down. 45 runners finished in 2025.

Three climbs and two major descents define the race. Descent 1 (km 13.08, 7.41km, 1,118m, avg -15.09%, rank 61/~390 for drop) arrives early -- a near-vertical technical plunge loading quads before the major climbs. Climb 1 (km 25.29, 6.51km, 1,201m, avg 18.45%, rank 91/~390 for rise) is the race-defining feature: a 1,201m wall at UPPER-tier gradient with near-vertical sections. Climb 3 (km 49.14, 6.90km, 1,021m, avg 14.79%) arrives at the midpoint on fatigued legs. Climb 2 (km 73.68, 12.51km, 1,198m, avg 9.58%) is the longest climb by distance -- 12.51km with 1,198m gain in the final third. Descent 2 (km 93.75, 9.15km, 968m, avg -10.58%) closes the race with 968m of descent in the final 10km on destroyed legs.

The Podbrdo Trail Running Festival is organised by Turisticno drustvo Podbrdo -- the local village Tourism Society, a community-run body. The festival's shorter GM4O (Gorski Maraton Stirih Obcin) distance has results on record from at least 2002, making this one of Slovenia's longest-running mountain events. The 100km UTP distance launched in 2015. The Baska grapa valley is identified on the official race website as the location of the first mountain run in Slovenia, held in 1970 -- a heritage claim positioning the area as the birthplace of Slovenian mountain running. On the international side, the 2016 GM4O edition hosted the 13th WMRA World Long Distance Mountain Running Championships, and 2011 hosted the 8th -- formal recognition of this course as world-class mountain running terrain.

UTMB Index data confirms 45 finishers in 2025 -- a very small field by European 100km standards, almost entirely Slovenian and central European (Slovenia, Poland, Czech Republic, Germany, Hungary, Italy confirmed in 2025). The 2025 men's winner was Ales Frlic (SLO) in 12:58:17; the women's winner was Martina Klancnik Potrc (SLO) in 15:11:42. There are no English-language race reports, no Racecheck reviews, no RaceRaves listings, and no iRunFar or international press coverage. For runners who rely on English-language race intelligence -- course photos, nutrition advice, runner experience -- this race is a near-total blank. That absence is both the editorial challenge and the discovery opportunity: Ultra-Trail Puseljc is a formally recognised, UTMB Index-listed, gradient-extreme 100km with WMRA heritage, operating almost entirely below the radar of the English-speaking trail running world.

Ljubljana Airport (LJU) is approximately 68 minutes from Podbrdo by car -- not classified as IS FAR in the DTR database (under 180-minute threshold). The drive runs via the Most na Soca junction, approximately 100km southwest of Ljubljana. A car is strongly recommended: the valley is remote with limited public transport frequency (train or bus to Most na Soca, then local taxi or ride-share). Accommodation in Podbrdo village itself is limited; recommended bases are Tolmin (approximately 20 min) or Bohinj (approximately 40 min). Book early: the June 19-21 event weekend coincides with summer tourist season in the Soca valley region. Alternative airports: Trieste TRS or Venice VCE (Marco Polo) for runners approaching from Italy. Entry fee: EU95 early / EU105 standard / EU115 on-day (2026 rates -- confirm 2027 fees at ptrf.si before entering).