Date
Sat, 22 May 2027
Start
07:00
Venue
Grimsthorpe Castle, Bourne, Lincolnshire, PE10 0LY
Bourne, Lincolnshire
Countdown
May
Seven laps of the same 10-mile loop, starting at 7am and running through the night. Mild hills, but the repetition is the real test.
Key facts
01Minimum age 18
02Mandatory kit required on any lap started after 18:00
0328-hour cut-off
Create a free training plan for the The Grim Reaper 113 km
7-day free trial, no card required
The course
One lap, on repeat
Bourne · one lap
Distance113km
Total climb168m
Start · finishOne lap · elevation
0 kmDrag map to rotate16.1 km
Weather
Late-May, Bourne
17°CTypical high
8°CTypical low
2°CColdest in 20 years
42%Days with rain
Highs around 17°C and lows around 8°C, but it has dropped to 2°C. Rain on 42% of days.
NASA POWER data, 2006-2025, the week either side of race day
Results
Course verified. Results not yet available.
Organiser
OrganiserBog Dog Running (Steve Cole and Laura Bailey)
Websitebog-dog.co.uk
Instagram@bogdogrunning
Running since2013
Training
Training for the The Grim Reaper 113 km
We don't do generic plans. We combine deep knowledge of this race's demands with your recent training, then build a plan with you that progresses as you do.
Beina integrates directly with your existing tools to understand your current fitness, and synchronise your planned sessions.
Intervals.icuWhat a The Grim Reaper 113 km plan targets
Typical sessions
113 km with 168 m of climbing
Time on feet and fatigue resistance
Fuelling and pacing for the whole event
What your weeks look like
Typical sessions
Long runs that build time on your feet
Tempo and threshold sessions to hold race pace
Back-to-back weekend runs for fatigue resistance
Not a generic schedule
Typical sessions
Built from your current fitness and the time you actually have
Adapts every week as Beina learns how you respond
Syncs your sessions straight to Garmin and Wahoo
One clear next session, never a wall of spreadsheet
Entries open now
Get your The Grim Reaper 113 km plan.
7-day free trial, no card required.
Other races at The Grim Reaper
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