Course Description


After the harvest, around the margins of freshly ploughed fields, we can run on this special landscape. It's a tough 90% off-road circuit. Knobbly shoes would be ideal for gobbling up the rough stuff along the trails. You’ll visit some tranquil woodland, brush past beehives, perhaps sight a rabbit, fox or badger home. To further enhance the fun at around 8k, you’ll be faced with some pony jumps to tackle.


Listen to Greta

Bring like-minded runners together to enjoy an environmental theme

As a group of eco-minded athletes with a dogged determination to rid the event from plastic, we wanted  to create a fun race in an area of outstanding beauty. We’re back, staging the Ecorun again with the highest possible environmental standards, all totally on private property. You can expect a low-key, non-corporate atmosphere.

About us

Born out of a passion for running, lake swimming and Triathlon, our team have been setting up races for quite some time. We were the founder organisers of the first Harpenden half marathon in 2018, (now under superb new management) and the original Merchant Taylors' Triathlons, 2008-14. We're proudly independent and free from the contraints of the hapless UK Athletics organisation. This enables us to offer the same affordable entry prices for everyone, except for vegans, who get a discount!


Talk the Talk and Walk the Walk


Setting up a race is a fairly destructive affair, usually with lots and lots of cheap plastic products. The finishers are often given polyester t-shirts, tyvek race numbers and plastic goodie bags. Contractors use diesel generators, plastic finish gantries, inflatables, and often parade a fleet of hot dog or burger vans. This made us come up with some other ideas.


With a view to giving the event an earthier feel, we decided to take action and replace the above with a fairly priced vegan or vegetarian stall only, not to have any diesel generators or cars with engines idling, to place straw bales as a race gantry. We'll be using hessian as a race number material. We’ll source some organic cotton as a start-bunting, salvage some wood, paper and card as race signage and make the turn-around bollards from timber. The water will be in plant made bottles and the cups can easily be plant based too. The finishers’ memento won’t be the usual generic mass produced type, but something that is bespoke. You can expect lots of friendly marshals and some fresh fruit at the finish to help make this a truly fun 10k!


Online entries: Pay by major credit/debit cards. 



If you would also like to support this race then contact us at:

icon Registration

Race numbers will not be posted, they can be collected at the event venue on the morning of the race. Registration will open at 7:45am and will close 15 minutes before the start of the race. Please arrive in sufficient time to collect your race number.

icon Event Profile

Event Name

Harpenden Ecorun 10K

Event Distance



Off-road through farmland






Every 1K




10km - 16


Harpenden Ecorun



The higher of a £1 or 6% transaction fee will be added by ATW


icon Prizes & Mementos

Overall 1st, 2nd, 3rd male and female prizes


Other Race Information

Race Numbers
Please wear your hessian hand-made number pinned on you somewhere

There is no parking absolutely anywhere on site. Please allow time to warm up run about 1km from Southdown/ Harpenden area

There'll be fresh fruit to finish and a drinks celebration to look forward to later in the 17th century free house, the Lower Red Lion, Fishpool St, St Albans

Time Limit
The 10km will have a time limit of 1 hour 30 minuits

Changing, Toilets & Baggage Storage
There will be only limited toilets on the field. We advise that you come changed and ready to run if possible. There will be an unsupervise baggage area, uncovered, so please leave valuables at home

ActiveTrainingWorld do not offer transfers or deferrals for this event or any events listed on the website. Instead every person who books an event has the option to purchase "Refund Protection" which allows them to get a full refund of entry fees in the event of an injury, illness or other reasons specified on the policy. The link to claim your refund will be on your confirmation email along with your booking reference number. Terms & Conditions are here


By entering this event you agree to the below:

DECLARATION:  I hereby declare that (1) I am an amateur according to the eligibility rule of UKA, (2) I am medically fit to run and I will do so at my own risk and agree not to hold the organisers responsible in any way for any injury or loss resulting from my participation in the event, prior to, during or after the event. (3) I understand the organisers reserve the right to alter the arrangements and conditions should circumstances require. The course is unsuitable for wheelchairs and prams. p>

I/We understand that entry fees are non-refundable.

In the unfortunate cancellation of the event through circumstance beyond the control of the race organisers.  I understand, and accept, the rules and terms of the entry including that there will be no refund of race fees.

LOCATION:  Pipers Lane, Harpenden, nearest postcode is AL5 1HQ. Details to follow.


Location: Harpenden Half, -, -, Hertfordshire, -