Dehesa and
montanera.

Two words for two different things

Dehesa is a managed cultural landscape of pasture and scattered Mediterranean oaks, mainly species within the genus Quercus. It supports extensive livestock rearing and depends on human management for its continuity. The Iberico standard also gives a concrete threshold of at least ten productive trees per hectare on average across the holding.

Montanera is the feeding system during the acorn season. Pigs use acorns, grass and other natural dehesa resources. Montanera is therefore not a region, a pig breed or the maturation of the ham.

The dehesa is more than an oak wood

Its open structure matters. The trees supply acorns and shade, while the ground between them provides pasture and room for animals to move. The landscape has been shaped to combine trees, grazing and extensive livestock. Translating dehesa simply as oak forest therefore misses how the system works.

For products sold as de bellota, it is not enough for a holding to look like a dehesa. The parcels used must be recorded as eligible in the montanera layer of Spain’s SIGPAC agricultural register. Permitted stocking density depends on tree-canopy cover and the actual acorn crop available that year.

What happens during montanera?

Under the current quality standard, animals must enter montanera between 1 October and 15 December. Slaughter takes place between 15 December and 31 March. The group must average 92 to 115 kilograms on entry, remain under this system for more than 60 days and gain at least 46 kilograms. Minimum slaughter age is 14 months.

These dates and weights are control points, not a recipe for flavour. Weather, the acorn crop, animal movement and the producer’s later salting and maturation all influence the finished ham. Montanera explains the production conditions during final feeding, but not the entire result.

What does de bellota mean on the label?

De bellota means that the animals go to slaughter directly after using acorns, grass and the dehesa’s other natural resources without supplementary feed during this period. It is a regulated category controlled through land, animals, time, weight and traceability.

Bellota does not state breed percentage on its own. A black seal means de bellota 100% iberico. A red seal means de bellota iberico with 50 or 75 per cent Iberian ancestry. The colour-seal guide shows how to read those facts together.

Four common misunderstandings

• Dehesa is not the name of one protected designation covering all jamon iberico.
• Montanera is not the pig’s whole life or the ham’s maturation period.
• Bellota does not automatically mean 100 per cent Iberian breed.
• A photograph of pigs beneath oak trees does not prove the category. The seal, complete designation and traceability do.

How to use this when buying

Start with the complete designation and official seal. Then check breed percentage and traceability. Dehesa and montanera help explain what de bellota actually means, but producer, maturation, format and the individual ham still need to be assessed separately.

Continue with the bellota, cebo and serrano comparison and the quality and traceability guide. The foundation of product, breed and seals is covered in What is jamon iberico?.

Sources: Royal Decree 4/2014 in Spain’s official state gazette and the Spanish Ministry of Agriculture’s control protocols for the Iberico standard. Checked 8 October 2026.