Trail
Backyard Loop
6.7 km
386m
Start: Apr 16, 02:00 PM
X Im!possible Backyard Ultra
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Trail in Switzerland, Zürich
Distances
About
X Im!possible Backyard Ultra is presented by X-Bionic as one of the toughest Backyard Ultras in the world, set in Zurich with a 6.706 km loop and ~380 m of climb held every hour until only one runner remains.
Catering & aid stations
Not specified on the event pages; typical for Backyard Ultra format.
Pacers
Event is a Backyard Ultra — runners complete loops of 6.706 km (~380 m climb, anti-clockwise) on an open-ended course until one runner remains; pacing aligns with the one-hour loop rhythm.
Results
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Typical weather in Zürich
Monthly averages based on historical data (2000–present).
Jan4°-2°
↑ 08:10
↓ 17:02
Feb6°-1°
↑ 07:33
↓ 17:49
Mar10°1°
↑ 06:39
↓ 18:32
Apr14°4°
↑ 06:38
↓ 20:15
May18°9°
↑ 05:50
↓ 20:56
Jun22°13°
↑ 05:30
↓ 21:25
Jul24°15°
↑ 05:46
↓ 21:20
Aug23°15°
↑ 06:23
↓ 20:39
Sep19°11°
↑ 07:04
↓ 19:40
Oct15°7°
↑ 07:45
↓ 18:39
Nov9°3°
↑ 07:32
↓ 16:52
Dec5°-1°
↑ 08:07
↓ 16:37
Last updated: Jun 5, 2026, 11:52:16 PM
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