Trekkers walking along footpath

Trek26 Snowdonia (Eryri)

Event Type Trek
Date 28 June 2025
Location Dolgellau
Level Very Tough
Registration Fee £25 for 26 miles, £20 for 13 miles
Fundraising Target £300 for 26 miles, £200 for 13 miles

Register your interest for Trek26 Snowdonia (Eryri) 2025 are we'll be in touch.

The challenge

Trek for loved ones and bring help and hope to everyone affected by dementia. Experience the natural beauty of Snowdonia National Park (Eryri) and its magnificent peaks, spectacular valleys, serene lakes and idyllic trails. 

‘It was a fantastic experience from start to finish, I loved every moment of it. All of the volunteers were full of energy and support, which was exactly what I needed in the final miles! ... Will definitely be back next time.’ 

- Trek26 participant 2024

What's included when you take on a Trek26?

  • A friendly team to support you every step of the way with fundraising tips and ideas.
  • Bespoke digital training plans put together by our professional training coaches.
  • Access to our event Facebook Group.
  • A fully supported route including regular rest stops with snacks, drinks and toilets.
  • Free breakfast, lunch and hot drinks included.
  • Medical support and back walkers along the route.
  • A medal and glass of bubbly to celebrate crossing the finish line!


You'll start and finish the trek at our event hub in Marian Mawr, Dolgellau.

The route

Both the 26 and 13 mile routes will start and finish at Marian Mawr in Dolgellau and follow a route through the towering peaks and breath-taking valleys of Snowdonia National Park (Eryri). You’ll take in stunning views of Cregennan Lakes, Mawddach Estuary and the legendary Cadair Idris. 

*The map above can be expanded for more detail. Simply click the box in the top right corner.

**Please note the route and rest stops above are subject to change.

Kit List

Download our kit list which you can tick off when packing for the trek. We also have some top tips on how to find the best kit for you


Fundraising Target

Your fundraising will ensure that people facing a dementia diagnosis won't be alone. The money you raise will pay for vital services and research into treatments to improve people's lives. 

13 miles

  • Registration fee: £20
  • Fundraising target: £200

26 miles

  • Registration fee: £25
  • Fundraising target: £300

Your fundraising target covers the cost of your place on the event and still have plenty of money left to help us get closer to a world without dementia.

It's always best to hit your target early, so once you sign up you'll have access to our exclusive online event hub packed full of helpful fundraising tips and tools. Plus, by hitting your target, you'll bag yourself a FREE trekking top to wear with pride on the day.


The route is designed to be challenging but is achievable for most people provided you train well in advance. When you sign up we’ll email you a training guide to help you prepare.

The minimum age limit for the Trek26 series is 14. All participants must be at least 14 on event day.

Anyone under 18 must be accompanied by an adult, who must also register and take part in the trek.

Absolutely! You can create your team when you register by clicking 'Create'. To join an existing team click on the ‘Find’ button and type either the team name or the name of the team captain. Every member of the team must register for the trek via the website (joining a team on Just Giving is not a valid entry for the trek).

Your fundraising target is still £200 per person for the 13 mile route or £300 per person for the 26 mile route, but you're welcome to combine your targets into one team total. 

When you register as a Team Captain, your team members will receive 20% off their registration fee when they sign up. Details of the discount will be emailed to the Team Captain upon registration.

You will need to be able to carry all essential kit required for the challenge e.g. waterproofs, layers, water (minimum 2 litres), sun cream and snacks. See full Kit list above

Please make sure you have trained with your backpack on and carrying everything you need, so that you are used to trekking with your pack at full weight.

We trek on varied and undulating terrain. Some sections may be muddy if it has rained so wearing suitable footwear is essential.

We'll have members of the team spread along the route, and a back marker walking at the rear. The route will be well-marked with brightly coloured marker arrows and there will be extra marshals at any sections that are less straightforward.

There'll also be staffed rest stops along the route, where we’ll be on hand to provide help and plenty of encouragement, and there will be refreshments, water refill stations, first aid support, and toilets at all rest stops.

Both the 13 and 26 mile routes will have a rest stop halfway along the route, where you can collect your lunch. The 26 mile route will also have an additional two rest stops. Please check your route map for specific rest stop locations.

This event is not a race; everyone should be able to trek at a comfortable pace. In order for the event to be managed safely, there will be a cut-off time.

The 26 miles should take approximately 9-10 hours but can take some walkers up to 13 hours. The 13 miles should take approximately 5-6 hours but can take some walkers up to 9 hours.

There will be toilet facilities at the event hub, where you start and finish your trek, as well as at each rest stop along the route.

We provide food, hot drinks, and water re-fill stations for every participant on a Trek26 event. We plan these rest stops every 6-7 miles to ensure our trekkers are fully supported, with lunch at the halfway rest stop for each distance.

• The start line - A breakfast snack, hot drinks, and water re-fill stations.

• Rest stops - A selection of snack bars, chocolate, fruit, crisps, hot drinks, and water re-fill station.

• Lunch - A selection of sandwiches, snack bars, chocolate, fruit, crisps, hot drinks, and water re-fill station

If you smash your fundraising target one month before your event day we’ll send you out a free trekking top. You don't need to get in touch to claim it - as long as you have hit your target on your JustGiving page or paid in cash donations, we'll send out your top automatically. 

If you hit your target after the one month deadline you can still claim your free trekking top on the day (visit our merchandise stand)

If you are fundraising in a team, please let us know by creating a team when you sign up so we can make sure you all receive your tops.

We carry on! Do make sure you check the kit list and come prepared for all types of weather.

No, we’re afraid not. Everyone taking part needs to be fully registered and fundraising to beat dementia.

Unfortunately, dogs are not permitted to take part in the trek due to safety issues and due to us trekking on privately owned land.

They are welcome to be on the event hub with friends and family but must be kept on a lead and the person looking after them is responsible for cleaning up any mess. 

There will be plenty of parking at Dolgellau Farmer’s Mart, a short walk from the event hub where you will start and finish your trek. Parking is free and no booking is required. Please allow time to walk from the Farmer’s Mart to the event hub.

Start times for the trek are staggered in waves from 06:10 until 7:00am for the 26 mile route, then from 8:30 until 9:30am for the 13 mile route. You can choose your preferred start time when registering. If you will be walking at a slower pace, we advise you to choose an earlier start time to allow plenty of time to complete the route.

We recommend arriving 30 minutes before your start time so you can grab breakfast, meet the team, and prepare for your trek.


Not a trekker? You can still do something incredible and make a difference to people affected by dementia.

We are looking for enthusiastic volunteers to cheer our trekkers over the finish line. We'll kit you out with an Alzheimer's Society t-shirt and provide you with everything you need to give our trekkers an amazing event day experience.

You'll help to set them on their way to raising even more money to change the lives of people affected by dementia. And we can guarantee you'll have a great time!


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