Bellevue, AB, Canada · Saturday, October 31, 2026

Timed 12 hours

The Dark 12 Hours Underground

45 days away

not publishedn/a Distance

not publishedn/a Climbing

not publishedn/a Grit

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.

53.5647° N, 113.4448° W© OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Field size ~12 Tiny. You will run alone for most of it.

DUV results for the 2025 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, October

Daytime high 9°C

Night low -1°C

Rainfall Dry — rain unlikely

Daylight 9 h 36 m of light

Regional 2001-2020 average for October — NASA POWER, grid elevation 720 m. Not a forecast.

The Aid Station

Course-specific beta from the community

👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

Gear for this race

Chosen for this trail race.

Trail Running ShoesCushioning on trail that is still there in the last quarter.
Race NutritionSelf-supported fuelling between aid stations.
Hydration VestsFlask capacity without the bounce.
HeadlampsA 12 h limit puts you out there after dark.
GPS WatchesBattery life first — an ultra outlasts most full-GPS modes.

Saucony

S/Lab Ultra 3

Premium ultra trail shoe with Advanced Chassis for stability on technical terrain.

$200 ★★★★★ 4.8

Tailwind

Endurance Fuel

All-in-one calorie and electrolyte drink mix. 200 calories per serving.

$25 ★★★★★ 4.8

Salomon

ADV Skin 12

Industry-standard 12L race vest with front flask pockets and minimal bounce.

$180 ★★★★★ 4.8

Petzl

NAO RL

1500-lumen reactive lighting headlamp with 15-hour runtime. Automatic brightness adjustment.

$150 ★★★★★ 4.7

COROS

APEX 2 Pro

GPS running watch with 75-hour GPS battery, topo maps, and training metrics.

$500 ★★★★★ 4.7

All gear guides →

Course Notes

The Dark is a loop race in the Bellevue Underground Mine with 6, 12, and 24 h categories. The mine shaft is 250m long with a 1% grade, so each loop is 500m. It is approximately 4m wide for most of its length. The goal is to run as far as possible.

Similar races

Other trail ultras of the same format.