Race detail
Fission 20 2027 Entry, Date & Race Info
Hamfields, South West, UK
Last checked: 6 June 2026
Quick summary
The Fission 20 is a 20-mile road race in Berkeley, Gloucestershire, and is a popular option for runners preparing for a spring marathon.
Next race
Sunday, 14 March 2027
Location
Hamfields, South West
Distance
20 Mile
Surface
Road
Upcoming dates
Choose a date and check the latest entry options.
| Date | Start time | Status | Entry |
|---|---|---|---|
Sun, 14 Mar 2027Next race | TBC | Closed |
Race overview
About Fission 20
The Fission 20 is a 20-mile road race in Berkeley, Gloucestershire, and is a popular option for runners preparing for a spring marathon.
The course is known for being flat and fast, making it well suited to marathon-pace practice and longer training efforts in the final build-up to race day.
It is often used as a key benchmark race, giving runners a clear indication of fitness ahead of their target marathon.
Planning to run Fission 20?
Frequently asked questions
Is Fission 20 2027 entry open?
Entries for the 2027 Fission 20 are currently closed.
When is Fission 20?
Fission 20 takes place on Sunday, 14 March 2027.
What is the Fission 20 course like?
The Fission 20 is a 20-mile road race in Berkeley, Gloucestershire, and is a popular option for runners preparing for a spring marathon. The course is known for being flat and fast, making it well suited to marathon-pace practice and longer training efforts in the final build-up to race day.
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