Ultra Running Hub Konstantinovy Lazne, Czechia · Friday, May 8, 2026
K6 Czech Ultramarathon Festival - 12h
We hold no course length for this race — a timed or backyard event is measured by the clock, not the kilometre — so there is no Grit score to give you.
What the course asks
DUV results for the 2026 edition (12h) — ranked runners only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, May
Regional 2001-2020 average for May — NASA POWER, grid elevation 494 m. Not a forecast.
Results history
| Year | Race | Finishers | Men's winner | Women's winner |
|---|---|---|---|---|
| 2026 | 12h | 28 | Riziero Boccia · 102.744 km | Gundula Weckenmann · 103.494 km |
| 2025 | 12h | 22 | Dalibor Muran · 117.172 km | Gundula Weckenmann · 105.474 km |
| 2024 | 12h | 16 | Simon Vejmelek · 113.181 km | Jana Reznickova · 115.548 km |
| 2023 | 12h | 11 | Lukas Kozlik · 112.534 km | Jana Maluchova · 96.717 km |
The field grew 27% between 2025 (22) and 2026 (28). 32% of the 2026 field were women.
DUV results for the 2026 edition (12h) — ranked runners only. Starters are not published, so the field was at least this big and no finish rate can be given.
The Aid Station
Course-specific beta from the community
With road terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for this road race with 12 m of ascent.
- Trail Running Shoes Cushioning on road that is still there in the last quarter.
- Race Nutrition Self-supported fuelling between aid stations.
- Hydration Vests Flask capacity without the bounce.
- Headlamps A 12 h limit puts you out there after dark.
- GPS Watches Battery life first — an ultra outlasts most full-GPS modes.
Similar races
Other road ultras of the same format.