11/02/2026
Let me introduce myself — Rachel Stephens, the heart and soul behind Kernow Killer.
Five years ago, Kernow Killer was on the brink of disappearing, and I stepped in and saved it. Not for the glory and certainly not because it was easy, but because it mattered.
Since then, I’ve worked relentlessly to keep this event alive and growing. Running an OCR event today isn’t just about building brutal, muddy courses (although that’s a huge part of it) — it’s the endless paperwork, permissions, risk assessments, planning, organising, logistics, and problem-solving that happens behind the scenes long before anyone even reaches the start line.
Despite all the challenges that come with running events in today’s world, Kernow Killer is still here and stronger than ever — because I refuse to water it down or let it become something it’s not.
Let’s be clear:
Kernow Killer is the biggest, the muddiest, and the toughest OCR event in Cornwall.
But Kernow Killer is about more than mud and medals. Over the years, we’ve proudly raised vital funds for Children’s Hospice South West, helping support families when they need it most. That will always be at the very heart of this event.
And none of this — absolutely none of it — would be possible without our incredible marshals. These amazing people give up their own time, weekends, and energy to stand out on the course, guide runners, keep everyone safe, and make sure the event runs smoothly. Rain, wind, mud, and long hours — they show up and they graft. Kernow Killer simply could not run without them.
This year, we’re also launching something new — a brand-new course for dog lovers, giving you the chance to tackle the mud and obstacles with your best four-legged friends by your side 🐾
There are companies out there who claim they’re bigger or better and talk about taking over — but they’re not. Bigger doesn’t mean tougher, better doesn’t mean muddier, and none of them deliver what Kernow Killer does.
My goal is simple: to keep Kernow Killer going for many, many years to come — staying true to its roots, its grit, its community, and its reputation.
This event needs your support to keep it alive.
Please check out the link, get yourself signed up, and come be part of it — because there truly is something for the whole family.
If you’ve crawled it, climbed it, dragged yourself through it, or crossed that finish line absolutely ruined — you already know.
Kernow Killer.
Built with heart.
Powered by community.
Finished in mud. 🖤🟠💪
Kernow killer K9 : https://www.sientries.co.uk/event.php?elid=Y&event_id=16940
Kernow killer : https://www.sientries.co.uk/event.php?elid=Y&event_id=16686
