GPS navigation only through 160K of Bulgaria's highest alpine wilderness
The Pirin Ultra 160K is one of Eastern Europe's most demanding ultramarathons, traversing the Pirin Mountains of Bulgaria — a UNESCO World Heritage National Park — on technical mountain terrain with no course marking whatsoever. Runners navigate 160 kilometers and 11,000 meters of vertical gain using GPS only, passing through remote alpine wilderness above 2,000 meters, scrambling through scree fields and dense dwarf pine, and crossing dramatic passes with panoramic views across the Balkans. The course loops from Bansko through eight aid stations, with the most technical and exposed section through the Pirin peak area between km 45–55 requiring careful navigation in any weather or light conditions. A mandatory medical examination is required before the race, and comprehensive gear including compass, GPS device, and thermal layers is required from start to finish. The race serves as a Hardrock 100 qualifier and UTMB World Series 100M event, attracting experienced mountain runners from across the world.
Recommended for seasoned ultrarunners
Bansko, BulgariaSeptember 11, 2026
Must meet custom qualifier requirements within the qualification window
Must have completed a minimum of 4 ITRA points from a single race prior to registration. This race is also a Hardrock 100 qualifying event.
| Location | km | Elevation |
|---|---|---|
Start Start | 0.0 | 929 m |
Banderitsa Aid Station | 10.0 | 1,812 m |
Mandrata (Outbound) Aid Station | 25.0 | 1,263 m |
Javorov Aid Station | 40.0 | 1,765 m |
Senokos Aid Station | 60.0 | 945 m |
Mandrata (Return) Aid Station | 86.0 | 1,263 m |
Begovitsa Aid Station | 104.0 | 1,799 m |
Trite Reki Aid Station | 115.0 | 1,605 m |
Bezbog Aid Station | 134.0 | 2,239 m |
Finish Finish | 160.0 | 931 m |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
September in the Pirin Mountains brings unpredictable alpine conditions — warm sunny days can shift quickly to cold rain and afternoon thunderstorms, particularly on exposed ridgelines. Nighttime temperatures above treeline can drop near or below freezing. Runners will experience a wide range of conditions over the 50-hour window, and mandatory gear reflects the real risk of hypothermia at elevation.
Course reaches above 2,800m on Pirin peak. Significant portions run above 2,000m throughout.
Afternoon thunderstorms common in September on exposed ridgelines and peaks. The section from km 45–55 around Pirin peak is particularly exposed.
Nighttime temperatures at elevation can drop near or below freezing. Thermal base layer and emergency foil are mandatory.
Mountain weather in the Pirin can change rapidly. Conditions vary significantly between valley and ridge elevations.
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