In Spain , this means a wine with defined higher requirements with regard to vinification, alcohol content and aging (maturation in barrel and bottle) than with normal bottlings. The provisions mainly concern red wines, for white and rosé wines the requirements regarding the expansion are usually lower. A Reserva must be aged for at least 36 months, at least 12 months in oak barrels and the rest in the bottle. The highest level Gran Reserva must have matured at least 60 months, of which at least 18 months (24 months were until 2005) in oak barrels and the rest in the bottle. These are often the best wines vintages and / or best grapes one vintage, In contrast to one Crianza (Level below Reserva) there are no special regulations for individual wine-growing regions for Reserva and Gran Reserva. Renowned wineries often exceed these requirements considerably. The famous top product "Gran Reserva 890" of the winery La Rioja Alta for example, it ages in barriques for at least six to eight years and in bottle for another six years.
In Portugal , the Reserva level may only be used for a “special vintage of outstanding quality”. A red wine must have been aged or stored for three years (one in the bottle) and a white wine for one year (six months in the bottle). If the alcohol content is at least 0.5% vol more than the standard DOC specification, a Portuguese Reserva garrafeira call.