Date
Sat, 22 May 2027
Start
08:00
Venue
Grimsthorpe Castle, Bourne, Lincolnshire, PE10 0LY
Bourne, Lincolnshire
Countdown
May
Four 10-mile laps of the same gently rolling loop. You get to know every bend, and the 27-hour limit leaves plenty of room to keep moving.
Key facts
01Minimum age 18
02Mandatory kit required on any lap started after 18:00
0327-hour cut-off
Create a free training plan for the The Grim Reaper 64 km
7-day free trial, no card required
The course
One lap, on repeat
Bourne · one lap
Distance64km
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
01Paula Downing06:54:369.3 km/h
02Melissa Mason08:07:137.9 km/h
03Kirsty Malone08:10:197.9 km/h
13
Women finishers
10:06:57
Median time
6.4 km/h
Median speed
Women · 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 64 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 64 km plan targets
Typical sessions
64 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 64 km plan.
7-day free trial, no card required.
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