Backyard Ultra

Rules

Below you will find the key rules of the Backyard Ultra format.

6.706 km Loop

Every runner must complete a loop of 6.706 km (4.167 miles) within one hour.

Start Every Full Hour

At the top of every hour, runners must be in the start corral and begin the next loop at the bell. A whistle will sound 3, 2, and 1 minute before each start.

Keep Going

Runners must continue completing loops as long as they can return to the start line within 60 minutes.

No Accumulated Rest

Any remaining time before the next bell is the runner’s rest time — there is no extra pause.

Stay on the Course

Runners may not leave the course until they finish the loop, except for emergency restroom breaks.

No Personal Aid During the Loop

Support, pacing, or assistance is only allowed between loops at the race base — never during a loop.

No Poles or Artificial Aids

Trekking poles and similar aids are not permitted.

Faster Runners Have Priority

Slower runners must allow faster runners to pass safely.

Mandatory Headlamp at Night

A headlamp is required between 21:00 and 06:00 for safety.

No Littering

Any runner caught littering will be disqualified (DNF).

Last One Standing

The race continues until only one runner completes a loop and starts the next one alone. That runner is the winner.

No Second Place

All other participants are officially DNF. If the last runner fails to complete their final loop, there is no winner.

Big’s Backyard Ultra

For the full and detailed rulebook, please visit:
bigsbackyardultra.com/backyard-ultra-rules

X Im!possible Backyard Ultra is officially registered with Big’s Backyard Ultra.