Nuuksio Classic 70km: Finnish Forest Ultra in Helsinki's Wild Backyard, 70km of Relentless Singletrack Through Nuuksio National Park, and Why 1,500m D+ Can Be Deceptively Brutal

Nuuksio Classic is one of the most deceptively challenging ultras in the DiscoverTrailRaces catalogue. It places among the flattest 70km races in the database (rank 352/~390). The difficulty comes from everything the gradient figures cannot measure: the course runs almost entirely on narrow, natural singletrack through Nuuksio National Park, where roots, rocks, and the variable surface of Finnish boreal forest reduce pace to a fraction of what the elevation profile would suggest. The course is technically flat, but that flat terrain is rooted singletrack, not recovery terrain. The remaining terrain is constant 20-50m rollers across 70km, each too small to be called a climb and too frequent to allow recovery. A strong runner finished in approximately 9h19m.

Pricing tiers of race entry fees starts at €99 when the registration opened on December 22, 2025 and it changes as the race date is coming close, the last tier of entry fee is at €126 per participant for 70km. Reminder that myraceresult.com may charge additional processing and transactions fees on top of the regular race fee.

The 70km Nuuksio Classic distance (branded Nuuksio70 Trail Ultra) has approximately 100 slots within a total event capacity of around 800 across the 42km and 70km distances combined. Confirmed finishers were approximately 111 in 2024 and 138 in 2025. The race requires at least one prior trail marathon or longer trail run as a prerequisite, which self-selects the field for experienced trail runners. Registration is through raceresult.com.

Early September in Nuuksio National Park typically brings some of the best trail running conditions in Finland: temperatures of 14-25°C, trails that are generally dry after summer, and daylight from approximately 06:00 to 20:30. The September 5 date specifically targets the summer-adjacent window before autumn moisture increases trail technicality. A race report from approximately 2023/2024 noted around 14°C and dry trails. The consistent challenge regardless of conditions is the underfoot terrain itself: rooted, rocky, narrow singletrack that demands attention throughout the full 70km. Running kit appropriate for a forest ultra is standard. Runners should plan for a significantly slower pace than road or well-maintained trail pace would suggest -- the terrain penalty is consistent and significant.

Helsinki Airport (HEL) is approximately 33 minutes from Espoo. Total HEL-to-start transfer is roughly 45-60 minutes depending on specific start point and transport choice. An optional paid event bus runs from Helsinki/Espoo to the start. Public transport to Espoo is very good from Helsinki city centre (train and bus), making this one of the most internationally accessible national park ultras in Europe. Helsinki has extensive accommodation at all price ranges; Espoo has additional options closer to the start area.