IV CxM Silvia Lara vs Ultra Trail Bosques del Sur
IV CxM Silvia Lara (21km, 1291m 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?
Intermediate 
Advanced Physical profile
| IV CxM Silvia Lara | Ultra Trail Bosques del Sur | |
|---|---|---|
| Date | 11 April 2026 | 30 May 2026 |
| Terrain | Trail | Trail |
| Difficulty | Intermediate | Advanced |
| Max elevation gain | 1,291m D+ | 3,700m D+ |
| Max ITRA | — | 3 |
Distances — IV CxM Silvia Lara
| Name | Km | D+ |
|---|---|---|
| Trail 21K | 21 | 1,291 |
| Trail 12K | 12 | 745 |
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
| IV CxM Silvia Lara | Ultra Trail Bosques del Sur | |
|---|---|---|
| Location | Cazorla, Andalusia | Cazorla, Andalusia |
| Distance between venues | 0 km | |
| Registration opens | — | 16 February 2026 |
| Registration closes | — | — |
| Mandatory Gear | 0 mandatory items | 6 mandatory items |
| Official website | Visit | Visit |
Pack 360 — Services
Registration
IV CxM Silvia Lara
No recommendations
Ultra Trail Bosques del Sur
No recommendations
Accommodation
IV CxM Silvia Lara
No recommendations
Ultra Trail Bosques del Sur
No recommendations
Gear
IV CxM Silvia Lara
-
Salomon Speedcross 6Recommended for bothSalomon
Ultra Trail Bosques del Sur
- Salomon Speedcross 6Recommended for both
Salomon
Nutrition
IV CxM Silvia Lara
-
Bocadillo de Guayaba Gourmet LatinoRecommended for bothGourmet Latino
Ultra Trail Bosques del Sur
- Bocadillo de Guayaba Gourmet LatinoRecommended for both
Gourmet Latino
Transport
IV CxM Silvia Lara
No recommendations
Ultra Trail Bosques del Sur
No recommendations
Car Rental
IV CxM Silvia Lara
-
Recommended for both -
Recommended for both
Ultra Trail Bosques del Sur
- Recommended for both
- Recommended for both
Insurance
IV CxM Silvia Lara
No recommendations
Ultra Trail Bosques del Sur
No recommendations
Body Care
IV CxM Silvia Lara
-
Buff CoolNet UV+Recommended for bothBuff
Ultra Trail Bosques del Sur
-
Julbo AerospeedJulbo
- Buff CoolNet UV+Recommended for both
Buff
-
Salomon Cross VisorSalomon
Sun Protection
IV CxM Silvia Lara
-
Recommended for both
Ultra Trail Bosques del Sur
- 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 IV CxM Silvia Lara. 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, IV CxM Silvia Lara 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.