The Grim Reaper is a distinctive endurance race designed to push participants to their physical and mental limits. Runners compete in a timed race format where they must complete as many laps as possible within a set time, with the "grim reaper" (a time cutoff) chasing them as they race against the clock. The event is known for its intense atmosphere and brutal challenge, attracting athletes looking to test their endurance and resilience. Whether participants aim to complete a set number of laps or go the full distance, The Grim Reaper offers a unique race experience that tests not only speed and stamina but also mental toughness in an exciting and competitive environment.
Races
100 Mile
70 Mile
40 Mile
10 Mile
The Grim Reaper 100-Mile Ultra, scheduled for May 24–25, 2025, is the ultimate endurance battle, featuring 1,676 meters of elevation gain across ten relentless loops of Grimsthorpe Castle’s legendary trails. Organized by Bog Dog Running, this race is designed for ultra veterans and ambitious first-timers, offering a true test of grit, patience, and strength.
On May 24, 2025, the Grim Reaper 70-Mile Ultra tests runners with 1,173 meters of elevation gain, spanning seven loops of Grimsthorpe Castle’s challenging multi-terrain course. Organized by Bog Dog Running, this ultra-marathon is designed for those who thrive on mental resilience, strategic fueling, and the thrill of pushing beyond their limits.
The Grim Reaper 40-Mile Ultra, set for May 24, 2025, presents a tough yet rewarding challenge, with 671 meters of elevation gain spread across four laps of the castle estate’s rugged trails. Hosted by Bog Dog Running, this race is a perfect entry point into ultra-distance running, offering a blend of endurance, pacing strategy, and breathtaking scenery.
The Grim Reaper 10-Mile Race, scheduled for May 24, 2025, is a fast yet scenic loop with 168 meters of elevation gain, winding through the historic Grimsthorpe Castle Estate. Organized by Bog Dog Running, this race offers an ideal blend of runnable trails, gentle hills, and stunning countryside views, with options to race during the day or night.
Weather based on historical averages.
FAQs
What is the Grim Reaper?
How long is the Grim Reaper?
Where does the Grim Reaper take place?
What is the elevation gain of the Grim Reaper?
How can I prepare for the Grim Reaper?
How do I choose the right training plan for the Grim Reaper?
The Grim Reaper 100-Mile Ultra, scheduled for May 24–25, 2025, is the ultimate endurance battle, featuring 1,676 meters of elevation gain across ten relentless loops of Grimsthorpe Castle’s legendary trails. Organized by Bog Dog Running, this race is designed for ultra veterans and ambitious first-timers, offering a true test of grit, patience, and strength.
The Grim Reaper is 161km long.
The Grim Reaper takes place in Grimsthorpe Castle Park & Gardens, Grimsthorpe, Lincolnshire, UK.
The Grim Reaper elevation gain is 1676 meters, which Runna classifies as a Moderate race.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Grim Reaper?
The Grim Reaper 100-Mile Ultra, scheduled for May 24–25, 2025, is the ultimate endurance battle, featuring 1,676 meters of elevation gain across ten relentless loops of Grimsthorpe Castle’s legendary trails. Organized by Bog Dog Running, this race is designed for ultra veterans and ambitious first-timers, offering a true test of grit, patience, and strength.
How long is the Grim Reaper?
The Grim Reaper is 161km long.
Where does the Grim Reaper take place?
The Grim Reaper takes place in Grimsthorpe Castle Park & Gardens, Grimsthorpe, Lincolnshire, UK.
What is the elevation gain of the Grim Reaper?
The Grim Reaper elevation gain is 1676 meters, which Runna classifies as a Moderate race.
How can I prepare for the Grim Reaper?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Grim Reaper?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Grim Reaper?
How long is the Grim Reaper?
Where does the Grim Reaper take place?
What is the elevation gain of the Grim Reaper?
How can I prepare for the Grim Reaper?
How do I choose the right training plan for the Grim Reaper?
On May 24, 2025, the Grim Reaper 70-Mile Ultra tests runners with 1,173 meters of elevation gain, spanning seven loops of Grimsthorpe Castle’s challenging multi-terrain course. Organized by Bog Dog Running, this ultra-marathon is designed for those who thrive on mental resilience, strategic fueling, and the thrill of pushing beyond their limits.
The Grim Reaper is 112km long.
The Grim Reaper takes place in Grimsthorpe Castle Park & Gardens, Grimsthorpe, Lincolnshire, UK.
The Grim Reaper elevation gain is 1173 meters, which Runna classifies as a Moderate race.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Grim Reaper?
On May 24, 2025, the Grim Reaper 70-Mile Ultra tests runners with 1,173 meters of elevation gain, spanning seven loops of Grimsthorpe Castle’s challenging multi-terrain course. Organized by Bog Dog Running, this ultra-marathon is designed for those who thrive on mental resilience, strategic fueling, and the thrill of pushing beyond their limits.
How long is the Grim Reaper?
The Grim Reaper is 112km long.
Where does the Grim Reaper take place?
The Grim Reaper takes place in Grimsthorpe Castle Park & Gardens, Grimsthorpe, Lincolnshire, UK.
What is the elevation gain of the Grim Reaper?
The Grim Reaper elevation gain is 1173 meters, which Runna classifies as a Moderate race.
How can I prepare for the Grim Reaper?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Grim Reaper?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Grim Reaper?
How long is the Grim Reaper?
Where does the Grim Reaper take place?
What is the elevation gain of the Grim Reaper?
How can I prepare for the Grim Reaper?
How do I choose the right training plan for the Grim Reaper?
The Grim Reaper 40-Mile Ultra, set for May 24, 2025, presents a tough yet rewarding challenge, with 671 meters of elevation gain spread across four laps of the castle estate’s rugged trails. Hosted by Bog Dog Running, this race is a perfect entry point into ultra-distance running, offering a blend of endurance, pacing strategy, and breathtaking scenery.
The Grim Reaper is 64km long.
The Grim Reaper takes place in Grimsthorpe Castle Park & Gardens, Grimsthorpe, Lincolnshire, UK.
The Grim Reaper elevation gain is 671 meters, which Runna classifies as a Moderate race.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Grim Reaper?
The Grim Reaper 40-Mile Ultra, set for May 24, 2025, presents a tough yet rewarding challenge, with 671 meters of elevation gain spread across four laps of the castle estate’s rugged trails. Hosted by Bog Dog Running, this race is a perfect entry point into ultra-distance running, offering a blend of endurance, pacing strategy, and breathtaking scenery.
How long is the Grim Reaper?
The Grim Reaper is 64km long.
Where does the Grim Reaper take place?
The Grim Reaper takes place in Grimsthorpe Castle Park & Gardens, Grimsthorpe, Lincolnshire, UK.
What is the elevation gain of the Grim Reaper?
The Grim Reaper elevation gain is 671 meters, which Runna classifies as a Moderate race.
How can I prepare for the Grim Reaper?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Grim Reaper?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Grim Reaper?
How long is the Grim Reaper?
Where does the Grim Reaper take place?
What is the elevation gain of the Grim Reaper?
How can I prepare for the Grim Reaper?
How do I choose the right training plan for the Grim Reaper?
The Grim Reaper 10-Mile Race, scheduled for May 24, 2025, is a fast yet scenic loop with 168 meters of elevation gain, winding through the historic Grimsthorpe Castle Estate. Organized by Bog Dog Running, this race offers an ideal blend of runnable trails, gentle hills, and stunning countryside views, with options to race during the day or night.
The Grim Reaper is 16km long.
The Grim Reaper takes place in Grimsthorpe Castle Park & Gardens, Grimsthorpe, Lincolnshire, UK.
The Grim Reaper elevation gain is 168 meters, which Runna classifies as a Moderate race.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Grim Reaper?
The Grim Reaper 10-Mile Race, scheduled for May 24, 2025, is a fast yet scenic loop with 168 meters of elevation gain, winding through the historic Grimsthorpe Castle Estate. Organized by Bog Dog Running, this race offers an ideal blend of runnable trails, gentle hills, and stunning countryside views, with options to race during the day or night.
How long is the Grim Reaper?
The Grim Reaper is 16km long.
Where does the Grim Reaper take place?
The Grim Reaper takes place in Grimsthorpe Castle Park & Gardens, Grimsthorpe, Lincolnshire, UK.
What is the elevation gain of the Grim Reaper?
The Grim Reaper elevation gain is 168 meters, which Runna classifies as a Moderate race.
How can I prepare for the Grim Reaper?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Grim Reaper?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
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This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by The Grim Reaper or Bog Dog Running Limited. All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the The Grim Reaper website.
