Höfuðborgarsvaeðið, Iceland · Saturday, August 8, 2026

Fixed Distance 100K

Raudavatn Ultra 100km

Race completed

100 km Distance

not publishedn/a Climbing

5.0 est Grit · Challenging

Calculated from 100 km alone — the organiser has not published an elevation profile. Read 5.0 as a floor, not a verdict.

64.1727° N, 21.5668° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 15 hours 9:00 min/km average. Comfortable. Room to walk the climbs and stop at aid. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Tighter than 71% of 100K races. Measured against 214 races of the same distance. Cut-off calculator →

Field size ~8 Tiny. You will run alone for most of it.

DUV results for the 2025 edition (100km) — finishers 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 13°C

Night low 8°C

Rainfall Showers likely

Daylight 17 h 19 m of light

Regional 2001-2020 average for August — NASA POWER, grid elevation 101 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	100km	8	Arnar Petursson · 06:45:16	Mari Jaersk · 10:53:19

50% of the 2025 field were women.

DUV results for the 2025 edition (100km) — finishers 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

👟 gear

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

By UltraHub Expert

🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 100 km of road.

Trail Running Shoes 100 km of road — cushioning that is still there in the last quarter.
Race Nutrition Past 100 km the palate quits before the legs do — carry more than one flavour.
Hydration Vests Flask capacity for 100 km, without the bounce.
Headlamps A 15 h limit puts you out there after dark.
Accessories Chafe and blisters end more 100 km races than fitness does.

Salomon

Aero Glide 4 Grvl

$159.95 ★★★★★ 4.5

Salomon

Pulsar Trail

★★★★☆ 4.4

Maurten

Gel 100

Hydrogel technology for 25g carbs per gel with minimal GI distress.

$3.5 ★★★★★ 4.7

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

Squirrel's Nut Butter

Anti-Chafe Balm

All-natural anti-chafe balm. Essential for 100+ mile races.

$12 ★★★★★ 4.8

All gear guides →

Overview

The Raudavatn Ultra 100km, a road race on a loop shorter than 5km, takes place in Höfuðborgarsvaeðið, Iceland. With only 1 edition run so far in 2025, and 8 finishers, this is a smaller event than 12% of 100k races.

Runners have 15 hours to complete the 100km distance, which means a pace tighter than 65% of 100k races. This requires maintaining a pace of 9 minutes per kilometer. The next edition is scheduled for August 8, 2026, with an entry fee of 14990 ISK.

Similar races

Other 100K road ultras, closest in distance first.