Marineland, FL, United States · Saturday, August 1, 2026

Timed 12 hours

River to Sea 12 Hour Race

Race completed

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.

29.6697° N, 81.2138° W© OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Field size ~36 Small. Long stretches with nobody in sight.

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, August

Daytime high 31°C

Night low 24°C

Rainfall Wet — expect rain

Daylight 13 h 35 m of light

Regional 2001-2020 average for August — NASA POWER, grid elevation 9 m. Not a forecast.

The Aid Station

Course-specific beta from the community

👟 gear

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

By UltraHub Expert

Gear for this race

Chosen for this road race.

Trail Running ShoesCushioning on road 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.

Brooks

Cascadia 18

Versatile trail shoe with BioMoGo DNA cushioning and TrailTack rubber outsole.

$140 ★★★★★ 4.5

Salomon

Aero Glide 4 Grvl

$159.95 ★★★★★ 4.5

Skratch Labs

Sport Hydration Mix

Clean electrolyte drink mix with real fruit flavor. Low sugar.

$20 ★★★★★ 4.5

Naked

Running Band

Minimalist waist-mounted running band. Ultra-light alternative to a vest for shorter races.

$60 ★★★★☆ 4.3

Petzl

NAO RL

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

$150 ★★★★★ 4.7

Suunto

Vertical

Titanium GPS watch with solar charging, offline maps, and 140-hour GPS battery.

$630 ★★★★★ 4.5

All gear guides →

Course Notes

Course is a 1 mile trail loop that is loaded with palm and oak trees in true old Florida hammock style. It is completely flat, shaded, nontechnical and absolutely gorgeous.

Similar races

Other road ultras of the same format.