X CxM Sierro vs La Osera
X CxM Sierro (24km, 1100m D+) vs La Osera (45km, 2300m D+). Side-by-side comparison: distances, elevation, difficulty, mandatory gear and registration. Which one suits you best?
Advanced 
Advanced Physical profile
| X CxM Sierro | La Osera | |
|---|---|---|
| Date | 3 May 2026 | 16 May 2026 |
| Terrain | Mountain | Mountain |
| Difficulty | Advanced | Advanced |
| Max elevation gain | 1,100m D+ | 2,300m D+ |
Distances — X CxM Sierro
| Name | Km | D+ | Max Time |
|---|---|---|---|
| CxM 24K | 24 | 1,100 | 4h30 |
| MiniCxM 12K | 12 | 680 | 4h30 |
Distances — La Osera
| Name | Km | D+ |
|---|---|---|
| Marathon 45K | 45 | 2,300 |
| Half Marathon 25K | 25 | 1,300 |
| Sprint Trail 12K | 12 | 600 |
| Hiking 12K | 12 | 600 |
Logistics & costs
| X CxM Sierro | La Osera | |
|---|---|---|
| Location | Sierro, Andalusia | Paterna del Madera, Albacete, Castile-La Mancha |
| Distance between venues | 141 km | |
| Registration opens | — | — |
| Registration closes | 29 April 2026 | — |
| Mandatory Gear | 3 mandatory items | 0 mandatory items |
| Official website | Visit | Visit |
Pack 360 — Services
Registration
X CxM Sierro
No recommendations
La Osera
No recommendations
Accommodation
X CxM Sierro
No recommendations
La Osera
No recommendations
Gear
X CxM Sierro
-
Salomon Speedcross 6Recommended for bothSalomon
-
Salomon ADV Skin 12Salomon
-
Salomon Soft Flask 150 mlSalomon
-
La Osera
- Salomon Speedcross 6Recommended for both
Salomon
Nutrition
X CxM Sierro
-
Maurten Gel 100Recommended for bothMaurten
-
Precision Fuel & Hydration PH 1500Precision Fuel & Hydration
-
Dátiles Medjool DorimedDorimed
La Osera
- Maurten Gel 100Recommended for both
Maurten
-
Bocadillo de Guayaba Gourmet LatinoGourmet Latino
Transport
X CxM Sierro
No recommendations
La Osera
No recommendations
Car Rental
X CxM Sierro
-
Recommended for both -
Recommended for both
La Osera
- Recommended for both
- Recommended for both
Insurance
X CxM Sierro
No recommendations
La Osera
No recommendations
Body Care
X CxM Sierro
-
Julbo AerospeedJulbo
-
Buff CoolNet UV+Buff
-
BodyGlide Original Anti-Chafe BalmBodyGlide
-
Compeed Ampollas Medianas DuploCompeed
La Osera
-
After Bite Xtra GelAfter Bite
Sun Protection
X CxM Sierro
-
Recommended for both -
Recommended for both
La Osera
- Recommended for both
- Recommended for both
Summary
If you're looking for a longer distance, La Osera is the choice. If you prefer a shorter and more accessible race, consider X CxM Sierro. In terms of elevation gain, La Osera is the more demanding option. Both races offer a complete Pack 360 with everything you need for race day.
Frequently asked questions
Which is harder, X CxM Sierro or La Osera?
When does each race take place?
How many distances does each race offer?
What type of terrain does each race have?
Do I need the same mandatory gear for both?
Plan your race
Compare Spain's best trail running races side by side. Analyze distances, elevation, registration prices, mandatory gear and the complete Pack 360 to make the best decision.