Toughest in Oslo, Norway. 4 events over 2 days, Sep 4–5, 2027.
Toughest Oslo is the most dramatic finish in the series. The 8 km main race works through varied forest and hill terrain in the Holmenkollen area above the city, then sends you straight up the Holmenkollen ski slope itself to the finish. It is a brutal, entirely legitimate closing obstacle, and it is the reason Oslo has a reputation among Nordic OCR regulars.
Race weekend follows the standard Toughest pattern: main race plus the Double Distance add-on (two laps, about 16 km) on the Saturday, then Xplore (4 km, untimed, no penalty rounds) and Family (2 km) on the Sunday. All three run from the same arena, so mixed-ability groups can all race the same weekend.
Holmenkollen sits at the end of Oslo's metro line 1, about 25 minutes from the city centre, so this is the rare mountain-terrain OCR you can reach on public transport from a downtown hotel. Prices are in NOK.
The organizer has not published start times yet. Waves fill up.
Register on toughest.se
Race village, nearest airport and how to get there.
Oslo, Norway
Airports within 200 km of the venue. Each one lists the other races you can reach from it.
Actual conditions on these dates over the past 5 years.
| Year | High | Low | Wind | Rain |
|---|---|---|---|---|
| 2026 | 13°C | 7°C | 8 km/h | 2.3 mm |
| 2025 | 18°C | 13°C | 27 km/h | 27.7 mm |
| 2024 | 17°C | 14°C | 12 km/h | 1.6 mm |
| 2023 | 22°C | 10°C | 17 km/h | — |
| 2022 | 14°C | 9°C | 9 km/h | 2.0 mm |
Toughest Oslo is a mountain, forest and trail course with Xplore, Main and Double Distance waves. Every training plan is built around your race date, your fitness and the days you can train.
Within 500 km and four weeks of this one, if you're making a trip of it.