La Osera vs Ultra Trail Bosques del Sur
La Osera (45km, 2300m D+) vs Ultra Trail Bosques del Sur (70km, 3700m D+). Side-by-side comparison: distances, elevation, difficulty, mandatory gear and registration. Which one suits you best?
Advanced 
Advanced Physical profile
| La Osera | Ultra Trail Bosques del Sur | |
|---|---|---|
| Date | 16 May 2026 | 30 May 2026 |
| Terrain | Mountain | Trail |
| Difficulty | Advanced | Advanced |
| Max elevation gain | 2,300m D+ | 3,700m D+ |
| Max ITRA | — | 3 |
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 |
Distances — Ultra Trail Bosques del Sur
| Name | Km | D+ | ITRA | Max Time |
|---|---|---|---|---|
| Ultra 70K | 70 | 3,700 | 3 | 17h |
| Marathon 42K | 42 | 2,438 | 1 | 10h |
| Half 21K | 21 | 1,190 | — | 5h |
| Mini 10K | 10 | 600 | — | 3h |
| Kids 4K | 4 | 100 | — | 1h 30min |
Logistics & costs
| La Osera | Ultra Trail Bosques del Sur | |
|---|---|---|
| Location | Paterna del Madera, Albacete, Castile-La Mancha | Cazorla, Andalusia |
| Distance between venues | 95 km | |
| Registration opens | — | 16 February 2026 |
| Registration closes | — | — |
| Mandatory Gear | 0 mandatory items | 6 mandatory items |
| Official website | Visit | Visit |
Pack 360 — Services
Registration
La Osera
No recommendations
Ultra Trail Bosques del Sur
No recommendations
Accommodation
La Osera
No recommendations
Ultra Trail Bosques del Sur
No recommendations
Gear
La Osera
-
Salomon Speedcross 6Recommended for bothSalomon
Ultra Trail Bosques del Sur
- Salomon Speedcross 6Recommended for both
Salomon
Nutrition
La Osera
-
Maurten Gel 100Maurten
-
Bocadillo de Guayaba Gourmet LatinoRecommended for bothGourmet Latino
Ultra Trail Bosques del Sur
- Bocadillo de Guayaba Gourmet LatinoRecommended for both
Gourmet Latino
Transport
La Osera
No recommendations
Ultra Trail Bosques del Sur
No recommendations
Car Rental
La Osera
-
Recommended for both -
Recommended for both
Ultra Trail Bosques del Sur
- Recommended for both
- Recommended for both
Insurance
La Osera
No recommendations
Ultra Trail Bosques del Sur
No recommendations
Body Care
La Osera
-
After Bite Xtra GelAfter Bite
Ultra Trail Bosques del Sur
-
Julbo AerospeedJulbo
-
Buff CoolNet UV+Buff
-
Salomon Cross VisorSalomon
Sun Protection
La Osera
-
Recommended for both -
Recommended for both
Ultra Trail Bosques del Sur
- Recommended for both
- Recommended for both
Summary
If you're looking for a longer distance, Ultra Trail Bosques del Sur is the choice. If you prefer a shorter and more accessible race, consider La Osera. In terms of elevation gain, Ultra Trail Bosques del Sur 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, La Osera or Ultra Trail Bosques del Sur?
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.