Bristol’s First Backyard Ultra

What is a Backyard Ultra?

The Bristol Backyard Ultra is a last-runner-standing endurance event. Runners complete a 4.167-mile (6.7km) loop every hour, on the hour. Finish the loop in time and you start again. Miss the bell, and your race is over.

There’s no set finish distance and no pressure to “go long”. Run one loop or run all day — this event is about pacing, persistence, and seeing how far you want to go.

The Course

The course is a professionally measured 4.167-mile loop set entirely within Blaise Castle Estate, one of central Bristol’s most beautiful wild spaces.

Expect a varied and runnable route featuring woodland trails, single track, open green fields, and gentle climbs — interesting enough to stay engaging lap after lap.

The loop starts and finishes at a central basecamp area with space for personal kit, crew support, and between-loop recovery.

Photos from recent Backyard Ultras

Stay in the Loop

Tickets are released in stages. Join the mailing list for early access, event updates, and behind-the-scenes build-up.

What You’ll Get

• A properly delivered Backyard Ultra — an accurately measured 6.7km loop, clear course markings, and on-the-hour starts, every hour.
• Beautiful trail running in central Bristol — woodland paths, open fields, and varied terrain set within the historic Blaise Castle Estate.
• A fully supported event basecamp — space for your kit, chair, crew setup, or small tent, with a clearly defined start/finish area for smooth loop transitions.
• End-of-loop aid station — water, hot drinks, and essential snacks available at the end of every loop, day and night.
• Toilets available on site — permanent facilities within the estate, close to the event hub.
• Car parking nearby — convenient public parking within walking distance of the start/finish area.
• Free professional photography — high-quality images capturing the grit, determination, and atmosphere of the event.
• A welcoming environment for friends and family — a nearby café for food and coffee, plus a play park to keep supporters entertained while you run.
• An inclusive, runner-first atmosphere — whether this is your first ultra or your fiftieth, everyone is welcome and supported.
• A true Backyard Ultra experience — run, jog, or walk. Stop when you choose. The only requirement is completing each loop within the hour.

Contact

Questions? Want to get involved?
Email us at info@gravelandgritevents.com