Ultra Running Hub St. Louis, MO, United States · Saturday, April 3, 2027
Fixed Distance 50K
Double Chubb 50k
212 days away
50 km Distance
not publishedn/a Climbing
2.5 est Grit · Entry level
Calculated from 50 km alone — the organiser has not published an elevation profile. Read 2.5 as a floor, not a verdict.
What the course asks
Time limit 9 hours
10:48 min/km average. Generous. Walkable throughout for most of the field. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Tighter than 72% of 50K races. Measured against 982 races of the same distance. Cut-off calculator →
Field size ~59 Small. Long stretches with nobody in sight.
DUV results for the 2026 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, April
Daytime high 20°C
Night low 7°C
Rainfall Showers likely
Daylight 12 h 41 m of light
Regional 2001-2020 average for April — NASA POWER, grid elevation 153 m. Not a forecast.
The Aid Station
Course-specific beta from the community
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 50 km of trail.
- Trail Running Shoes 50 km of trail — cushioning that is still there in the last quarter.
- Race Nutrition 50 km of self-supported fuelling between aid stations.
- Hydration Vests Flask capacity for 50 km, without the bounce.
- GPS Watches Battery life first — a 50 km day outlasts most full-GPS modes.
Course Notes
West Tyson Park, two out-and-backs, mostly single track and a little pavement.
Similar races
Other 50K trail ultras, closest in distance first.