Date: 18 April 2025
Location: Albisgütli, Zürich
Start time: 12.00
Format: Backyard Ultra
Time limit: open ended – the race continues until one runner complete a loop

The X Im!possible Backyard Ultra is not only one of the toughest Backyards ever designed — it is also a direct path into the Everesting Hall of Fame.

With ~380 m of elevation gain per loop, runners accumulate vertical meters incredibly fast:
6 loops: 1/4 Everesting
12 loops: Basecamp Everesting
24 loops (100 miles): Full Everesting

All vertical gain counts toward official Everesting achievements, making this event uniquely suited for runners aiming to combine the Backyard format with a high-elevation challenge.

X Im!possible is officially registered with Big’s Backyard Ultra and listed on DUV.

Although the Backyard format crowns only one official winner, we want every participant to take home something memorable. There will be a prize for the Last One Standing, special gifts for all runners who DNF, and every participant will receive the official event T-shirt.