ADELSÖ IF · EST. 1927
LAKE MÄLAREN, SWEDEN

New trail ultra

Adelsö
Ultra

A 43 km trail ultra around the island of Adelsö, over its highest hill, along the shore of Lake Mälaren, and back to where it began.

Adelsö, sketched from the map · 43 km loop

START · ADELSÖVALLEN, 0 KM KUSTABERGET, ~KM 35 FINISH, 43 KM
● UNDER CONSTRUCTION

We're in the early, get-things-running stage: building this website and getting ready to open registration through RaceID. Some details here may still change. Questions in the meantime? Write to info@adelsoultra.se.

Follow along on Instagram: @adelsoultra. That's where updates land first, and once registration opens we expect spots to go quickly, so keep an eye on your feed.

Distance

43 km, trail

Start

11:00 Adelsövallen

Race day

Sunday 16 May 2027

Elevation

~650 m gain

The race

Adelsö Ultra is a new 43 km trail race on Adelsö, an island in Lake Mälaren west of Stockholm. The course climbs to Kustaberget, the island's high point, and threads along shoreline, farmland, and forest before looping back to the start.

The weekend opens on Saturday with free camping, talks, and food at Adelsövallen. Sunday is race day: a single start at 11:00, four aid stations along the way, and a finish back where it began.

Adelsö Ultra is organized by Adelsö IF, marking the club's 100th anniversary. Proceeds go straight back into the club's youth and community activities.