Due to the proposed closure of Shepton mallet prison we have a new venue “Dorchester Prison ” Dorset.


After a 2 year break the Green mile is back for not just one day marathon  BUT a spooky Halloween evening edition as well
so your choice do you take on the gruelling stairs in the day light or in the Dark or do you do both.

2nd November 2024

Former HMP Dorchester  7 North Square, Dorchester, Dorset DT1 1JD

Head torches will be needed and a strong constitution.. Warning we will be changing the lighting and  turning the lights off to add to the atmosphere and the Victorian prison can be scary, you enter at your own risk.

This is the only marathon ran completely inside a prison in the world.


Day Marathon

9 AM to 3.30 PM
£60 affiliated £62 Unaff.
limited to 115 runners.
New Medal for 2024


Night Marathon

5PM to 11.30 am

£62 affiliated/ £64.Unaff

Limited to 100 runners


Both Marathons ( the long Stretch )

£100 affilated /3105 Unaff



Entry via www.sientries.co.uk