Trelly '25 | Grelly Cycling

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Trelly '25 - "Run, Sleep, Repeat"

After two incredible editions, we are thrilled to announce our 3rd trail edition: ' Trelly '25 '! We keep the good habit of exploring new regions in and around our country Belgium. This edition, we are exploring the breathtaking Semois region in the very South of Belgium. Famous for its beautiful nature, deep valleys, stunning viewpoints and more, this is a runner's paradise! Our journey kicks off in Haybes, a picturesque town in the French Ardennes, right on the banks of the Meuse. Mark your calendars for the first full weekend of June, we are welcoming all adventurous (trail-)runners amongst us to join. Expect everything you love about ultra-trailing: off-road challenges, endurance, camaraderie , self-supported experience, fun, ... and the thrill of discovering new horizons - this time, on foot! Whether you’re a seasoned trail runner or seeking your next big challenge, lace up your running shoes and join us for Trelly ’25. Adventure awaits!

What is it?

Trelly is more than just a run - it is a multi-stage trail run adventure with a social twist! Over the course of 3 unforgettable days, you will cover a distance anywhere between 100 km and 100 miles. Each day offers 2-3 distance options, and while we will all start together, it will be up to you to pick your pace and be smart regarding your own supplies - remember that Trelly is a self-supported event.

Is it a race ? Not really … Is it a challenge? Yes, sure!

Start: June 6th, 2025 - ~9:00 a.m.

Finish: June 8th, 2025 - ~3:00/4:00 p.m.

Start / Finish location: Haybes, 08170 France (to be confirmed).

Day distances will vary between 30-65 km/day, to reach a total of ~100 to 160 km after 3 days.

Limited # Spots: with a small group, there is more flexibility, more social interactions, ... and we value that a lot! We will limit our event to 20 participants.

Place to be ?

This year’s course brings us through the enchanting Semois and Meuse region, starting and finishing in France while embracing the natural beauty of southern Belgium. Guided by the meandering Semois River, you’ll encounter challenging climbs, breathtaking viewpoints, and countless moments to connect with nature. While last year’s Mullerthal trails were all about rock formations, this year’s focus is on steep ascents and scenic rewards. For simplicity and a touch of comfort, we’ve opted for a single base camp for 2 nights. This means two point-to-point tracks (on Day 1 and Day 3) and a looped course on Day 2. The result? Mornings and evenings that are a bit more relaxed, giving you time to recharge and connect with fellow participants.

Where will we sleep? We have spotted a well-located glamping area, offering choices to suit different preferences. From cozy glamping tents with a good bed & shared showering facilities to fully-equipped chalets with multiple rooms.

What about breakfast and dinner? Breakfasts and dinners will be taken care of so you can focus on the adventure ahead. We’ll make it work, no worries !

The Course

In good Trelly tradition, the final tracks will remain a surprise until just one week before the event. For now, they are still on the drawing table, but expect something in the range of up to 2500m+ for the 60km tracks. If you love panoramic viewpoints and slightly more technical trails, you'll have to climb :-). Once we have more detailed info, we surely update the page.

Although this might look over the limit, take in mind that there is no rush, and you have the whole day to tackle your chosen distance. Also, you can choose the distance on the day itself: it’s perfectly fine to do (for example, depending on the final tracks) 60/35/40 kms or 35/45/30 or even skip the 2nd day and cheer for the other participants - it all fits in the Trelly spirit.

Budget for the weekend

As we will be a small group, the total cost will depend on your glamping choice and the occupancy of the chalets. To ensure everyone gets a good night’s rest, we won’t pack the chalets to full capacity—because restful sleep is key to conquering this adventure!

Accommodation Options: