Date
Sat, 22 May 2027
Start
07:00
Venue
Grimsthorpe Castle, Bourne, Lincolnshire, PE10 0LY
Bourne, Lincolnshire
Countdown
May
The full 100 miles as ten laps of one loop, with a night in the middle. The climbing is modest, so the challenge is staying with it.
Key facts
01Minimum age 18
02Mandatory kit required on any lap started after 18:00
0328-hour cut-off; a recent 50-mile finish is recommended, not required
Create a free training plan for the The Grim Reaper 161 km
7-day free trial, no card required
The course
One lap, on repeat
Bourne · one lap
Distance161km
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
2024 results
Who finishes, and how
#RiderTimeAvg speed
01Alex Whearity16:25:559.8 km/h
02Simon Burcham18:48:158.6 km/h
03Mike Reid21:00:437.7 km/h
8
Finishers
23:33:49
Median time
6.8 km/h
Median speed
Overall · 2024 results, as published by the organiser.
How fast could you finish?
Get a prediction based on your recent training
Organiser
OrganiserBog Dog Running (Steve Cole and Laura Bailey)
Websitebog-dog.co.uk
Instagram@bogdogrunning
Running since2013
Training
Training for the The Grim Reaper 161 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 161 km plan targets
Typical sessions
161 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 161 km plan.
7-day free trial, no card required.
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