5 trail running races to discover in May: lesser-known races across Europe
Looking for your next trail running adventure this spring? While the biggest races sell out months in advance, Europe still offers a selection of lesser-known trail running races that deliver equally powerful experiences.
From remote mountain regions to volcanic islands, these races combine technical terrain, authentic atmospheres, and unique landscapes without the crowds.
Here are five trail races in May that deserve your attention.
Transylvania 100 — Romania
Set in the Carpathian Mountains, Transylvania 100 is one of the most distinctive trail running races in Eastern Europe.
The course features steep climbs, technical sections, and forested trails, all set within a landscape shaped by history and legend. One of the highlights is the proximity to Bran Castle, adding a unique cultural layer to the race.
Runners should expect challenging elevation gain, variable weather conditions, and long, isolated sections.
Why run Transylvania 100:
- Technical mountain terrain
- High elevation gain
- Unique cultural setting in Transylvania
Ultra Trail Tour de Nancy (UTTN) — France
The Ultra Trail Tour de Nancy (UTTN) is a well-organized event located in eastern France, offering a balanced mix of accessibility and challenge.
The course runs through forests, rolling hills, and well-maintained trails. While it is less technical than high mountain races, it still requires solid endurance and pacing strategy.
The race stands out for its efficient organization and strong local atmosphere, making it suitable for both experienced runners and those moving into longer distances.
Why run UTTN:
- Accessible yet challenging terrain
- High-quality organization
- Ideal progression race for longer distances
100% Mojanchi Trail — Italy
The 100% Mojanchi Trail takes place in the Varese region in northern Italy and remains one of the most underrated trail races in the area.
Starting from Mesenzana, the race connects Valtravaglia and Valcuvia through historic paths. The 34 km course is particularly demanding, featuring steep climbs, fast descents, and technical sections.
Runners will pass military trenches, mountain ridgelines, and cultural landmarks, creating a race experience that blends history with performance.
Why run Mojanchi Trail:
- Technical and varied terrain
- Strong elevation profile
- Historic and cultural elements throughout the course
Ultra Trail Graderas – Valle de Vio — Spain
Located in the Aragonese Pyrenees, the Ultra Trail Graderas – Valle de Vio is one of the most authentic trail running races in Spain.
The course follows ancient paths connecting villages such as Buerba, Vio, Nerín, and Fanlo. It is a demanding race with steep climbs, technical descents, and remote sections that require strong mountain awareness.
This race focuses on preserving traditional routes while offering a pure trail running experience.
Why run Ultra Trail Graderas:
- Technical Pyrenean terrain
- Remote and uncrowded environment
- Strong connection to local culture and history
Santa Maria Trail Run — Portugal
The Santa Maria Trail Run takes place in the Azores and offers a completely different trail running environment.
The course combines ocean views, volcanic terrain, and green landscapes. Runners will encounter varied terrain, including exposed sections and technical paths that require careful pacing.
This race is particularly attractive for those looking to combine competition with travel.
Why run Santa Maria Trail Run:
- Unique island setting in the Azores
- Volcanic and coastal terrain
- Strong experiential component beyond the race
Why these trail running races deserve attention
Although these races are less known than major international events, they offer key advantages:
- Authentic trail running experiences with less commercialization
- Lower runner density and better race flow
- Diverse European landscapes, from mountains to islands
- Strong local identity and community involvement
Choosing one of these races allows runners to focus on the experience, not just the result.
Trail running tips before choosing your next race
Before selecting a trail race in May, consider the following:
- Analyze the elevation gain and terrain type
- Review feedback from previous participants
- Plan travel and accommodation in advance
- Match the race distance with your current training level
For more race reviews and detailed trail running insights, visit TrailRunAdvisor.