Please do not attend parkrun if you display any COVID-19 symptoms

The Course

The course is 5000m (5k) long. This has been accurately measured by us with a professional measuring wheel. The course is in Aldenham Country Park, Elstree. The course is run on a mixture of dirt paths, grass and pavement. Some sections of the course may accumulate mud, leaves and puddles after rain. Dependent on availability, marshals will be at key sections of the course, or signs will be in place.

Please remember that the parkrun uses shared paths. For the continued success of the event, please give way to other park users. This won't hurt your time, it won't stop you from getting a PB and it will make sure everyone continues to enjoy the event.

Please, wherever possible walk, jog, cycle or use public transport when attending the event. If you do have to drive, please consider car-sharing to reduce our impact on both the environment and other park users. Please also watch out for other park users when arriving and leaving. Parking may be limited so try to arrive early.

Course Safety

The Aldenham parkrun is a fun, free event organised by volunteers for the benefit of everyone. We wish to make the run as safe as possible, so runners, spectators and helpers are asked to take care about the following:

  • Please be considerate to the park and other park users at all times.
  • Children under the age of eleven must be accompanied (within arm's reach) throughout the run by a parent, guardian or appropriate adult of the parent's choice.
  • Please arrive by foot, by pedal-power or by public transport if you can - your efforts help to reduce our impact on the park and the planet.
  • Please consider volunteering to help occasionally - this event survives only because of your generosity - please visit the volunteer page for more information.
  • Take care near roads and car parks - some vehicles drive very quickly. Please congregate away from the cars and be careful in particular if you have children. If you’re driving to the run, please drive carefully even if you’re late!
  • When running, take care on uneven surfaces - whether on grass or on tarmac. Watch out for cyclists, other runners, pedestrians, children, dogs, wildlife, park animals, vehicles, park maintenance work, falling branches, bollards, posts and other obstacles around the course.
  • Please ensure that you are fit enough to walk, jog, run 5k (3.1 miles) with us. Health advice about running can be found at the excellent Runners' Medical Resource website (although this external website focuses on preparation for a race and does not describe parkrun events).
  • Remember to warm up before the run.
  • If you see a runner with a serious problem, please stop to help them out and get help as soon as possible.
  • If you’re watching, keep clear of runners on the course, and look after any children and dogs you may have with you.
  • It is not permitted to run with a pushchair and a dog at the same time.
  • Lyme Disease is a bacterial infection spread to humans by infected ticks. Consider protecting yourself by wearing repellent when at parkrun events in grassy or wooded areas. See for further details.
  • You are welcome to take part with a dog, but please keep the dog on a short lead or short harness and under control throughout the event. Please also review the parkrun support page article about running with a dog at parkrun events.
  • Runners pushing buggies are welcome, but please take care of others around you and do your best to start at an appropriate place in the field for your pace.

We hope these tips help to ensure that Aldenham parkrun is fun and safe for everyone.

Age Grading

All parkrun events use Age Grading to help parkrunners compare results.

Age Grading takes your time and uses the world record time for your sex and age group to produce a score (a percentage). This score allows you to compare your personal performance against other people's performances even though they might be a different age and a different sex to you - the higher the score the better the performance. The scores can also be compared across different race distances - to allow you to, for example, compare a 5km time against a marathon.

For more information, please see our Support page.

Course Map

Course Description

Starting from the Aldenham Country Park car park, the course is two clockwise loops of Aldenham reservoir, crossing the dam causeway and looping back through the woods. The first lap takes in an inner loop of the reservoir, following the waterline (turn right at the marshal point). The second, slightly shorter lap (turn left at the marshal point) cuts through a hedged pathway to the finish.


Car parking charge has changed - the new discounted rate for parkrunners is £3.00 (which now includes VAT). The full rate is £4.50, but discount is available to anyone who shows a barcode at the mobile sales facility outside the farm shop / adjacent the Clock House Kiosk before 10:00. There is now no lower spending limit on card/contactless payments.

Toilets, hand washing. disabled toilets and baby changing facilities are available in the car park toilets next to the exit barrier and next to the Farm Office (beside the Play Barn). There are also bike racks, picnic and BBQ areas and outdoor play areas.

Getting There

Location of start

The run starts on the grass adjacent to the Aldenham Country Park car park.

Getting there by public transport

Train: Elstree and Borehamwood is the nearest train station, which is 3km (about 40 minutes) from the country park.

Train: 107 to Elstree Village from Elstree and Borehamwood station. However we strongly recommend using the website where you can enter your journey details using the postcode WD6 3BA.
The nearest bus stop is by the Fishery Bar on Elstree Road. You can enter directly into the Country Park opposite the bar and use the lakeside path to walk around to the car park where the run begins. The walk is about 1.2km (15 mins).

Getting there on foot

The park can be accessed on foot via Dagger Lane, Aldenham Road and Watford Road.

Getting there by road

The country park is located on Aldenham Road, post code WD6 3BA. It can be reached via the A5, A41, A1(M) or M1 (J5). Look for the brown signs on nearby roads.

Car parking charge has changed - the new discounted rate for parkrunners is £3.00 (which now includes VAT). The full rate is £4.50, but discount is available to anyone who shows a barcode at the mobile sales facility outside the farm shop / adjacent the Clock House Kiosk before 10:00. There is now no lower spending limit on card/contactless payments.

Post Run Coffee

Every week we grab a post parkrun coffee in one of the two cafes on site at Aldenham Country Park. The Clock House Kiosk serving a selection of refreshments and snacks such as ice creams, coffees and sandwiches has benches outside. Rustic Rhubarb offers a sit down meal with both outdoor and indoor seating serving up all day breakfasts and homemade cakes - please come and join us!