Run the grim reaper

The Grim Reaper is back and he's coming for you!

This multi-distance event at the stunning Grimsthorpe Castle Estate in South Lincolnshire gives runners the option of four solo distances - 10, 40, 70 & 100-miles with a 40-mile and 100-mile team option too. There will be two 10-mile races, one in the morning and a night version. The Grim Reaper will take place on May 20 & 21, 2023.

Expect a mix of estate roads, limestone tracks and grass trail. Trail shoes are recommended, especially in damp/wet conditions.


The new direction for the Grim Reaper


The Grim Reaper was launched in 2010 (with 12 entrants) by keen ultra-runner and event organiser Keith Gray who grew it to a peak of 250 runners. After deciding to take a step back from race organising, the Grim Reaper is being taken in an exciting, new direction by Steve Cole & Laura Bailey, runners local to the Grimsthorpe Estate who compete in races of distances from 10km up to 100-miles.

laura and steve in circle
steve, natalie, keith, mum
laura and steve

Located at the beautiful Grimsthorpe Castle


The route is a 10-mile loop that covers beautiful grass trails through ancient woodland, limestone tracks, quiet estate roads and a stretch along a disused Victorian railway line. It also skirts around the picturesque estate lake before reaching the start/finish point in front of the castle itself.


We class this as an ‘undulating’ trail course with no major hills to contend with, making it ideal for those new to ultra-running, looking to take the next step to a longer distance or aiming for a PB. The course will be fully marked.



Route/Aid Stations

The 10-mile loop around the stunning Grimsthorpe Castle Estate includes a mix of grass trails through ancient woodland, quiet estate roads, limestone tracks and even a disused Victorian railway line. You also skirt around the beautiful Grimsthorpe lake before reaching the start/finish point in front of the Castle itself.


There will be fully qualified medics onsite throughout the event.

Aid Stations

If you are running one of the ultra-distances you are expected to be self-sufficient and manage your own supplies. You are encouraged to bring your own tent/shelter which can be left close to the start/finish point. There will be an Aid Station at mile 5 stocked with limited snacks and water.

Food Drink

There will be hot food and hot/cold drinks available to purchase throughout the event (from 6am on Saturday until 10am on Sunday).

Course Marked



Expect a mix of estate roads, limestone tracks and grass trail. Trail shoes are recommended, especially in damp/wet conditions.


550ft per lap.


Runners are permitted to camp on-site on the Friday and Saturday nights. The camp area will be close to the start/finish line making it ideal for storing supplies for the race.

Start times/location

Grimsthorpe Castle, Bourne. PE10 0LY.

100 & 70-miles: 7am (Saturday 20th May)

40-miles: 8am (Saturday 20th May)

10-mile Day: 9am (Saturday 20th May)

10-mile Night: 9pm (Saturday 20th May)


May 20 & 21, 2023.




The more, the merrier. There is a small car parking charge of £5 per car (not per person) of which 100% goes to the Grimsthorpe & Drummond Castle Trust Limited (reg charity number: 507478). You are free to walk the whole course to cheer on competitors. There will be food and drink available to purchase.

Pacers (70 & 100 mile runners only)

Permitted from mile 50 and on foot only. Only one pacer per runner at any one time.


Whilst you are welcome to walk the whole course, a crew point is only permitted at the start/finish location. Anyone found breaking this rule will be disqualified.


Cut-Off Time

The three ultra-distances (40, 70 & 100-miles) have a strict cut-off time of 26-hours.

Mandatory Kit List (ultra-distances only)

  • Fully charged mobile phone, including the numbers for the Race Medic and Race Directors. Both numbers will be supplied to you prior to the race.
  • Survival blanket (1.4m x 2m minimum).
  • Headtorch/primary light source – minimum of 75 lumens.
  • Back-up light source.
  • Long sleeved baselayer (separate to what you are wearing at the start).
  • Waterproof jacket.
  • Water bladder/vest/bottle capable of carrying a minimum of 1 litre of water.
  • We are operating a cupless race so you must bring a cup with you. These will be available to purchase on the day.

Kit checks will be made upon registration. There will be a well-stocked running shop on site should you forget anything.

Mandatory Kit List (10-mile night race only)

Headtorch or chest torch.

Extra Info & Rules


If you need to withdraw for any reason, unfortunately we are unable to offer a refund. However, you can transfer your place up to two weeks prior to the event. Just email us confirmation of your transfer, including the name, address, email and phone number of the new competitor.

Qualification Standard

Whilst there is no official qualification standard, we suggest the following:

40-mile runners: Comfortable running 15 to 20-mile distances regularly.

70-mile runners: Comfortable running marathon to 50km distances regularly. There is a very generous cut-off limit so those walking still have a good chance of finishing.

100-mile runners: Have completed at least a 50-mile distance within a year of the event, with a finish time of at least 13-hours.


You cannot change the distance you have selected upon entry. If you enter the 100-mile race and decide to drop out at mile 70, you are classed as a DNF. Likewise, if you enter the 70-mile race, finish this distance and feel good enough to attempt the 100, you cannot upgrade to this distance.

Race Rules

  • Runners must follow the marked course at all times. Any runner found cutting the course will be instantly disqualified.
  • Your bib numbers must be on the front of your shirt/shorts and visible at all times.
  • Runners may not stash food/supplies on the course.
  • Littering will mean instant disqualification.
  • Runners are responsible for the actions of their pacers!
  • Pacers are permitted from mile 50 only and must be on foot.
  • Only one pacer at any one time.
  • Runners must carry mandatory kit equipment at ALL times.
  • Runners are not permitted to run with dogs at any point.
  • You must comply with all instructions given at the race briefing.
  • If you are unable to finish the race you MUST inform the race directors.
  • Walking poles are permitted


10-mile Day: £30

10-mile Night: £30

40-miles: £80

40-miles, teams of 4 max: £120

70-miles: £125

100-miles: £140

100-miles, teams of max 5: £275


Entry includes a finisher’s medal, t-shirt and goody bag. Upon entry you have the option of opting out of receiving a t-shirt and planting a tree instead through ‘Trees Not Tees’.

Trophies will be awarded to the 1st male & female in all solo races.

Those who complete the 40, 70 and 100-mile solo races get presented with a special finishers t-shirt.

grim reaper in red circle

Are you ready to take on the Grim Reaper?