September 13th, 2010
Why is the harvest date important? Olive oil is not like wine. It does not get better with age. The fresher the oil, the more flavorful and healthful it is. Oxidation and deterioration begins immediately after the fruit is picked from the tree, if not before. Olive oil should be consumed within 18-24 months from the harvest (18 months is better). In the northern hemisphere olives are harvested in the autumn, usually October, November and December. The southern hemisphere harvest occurs during our spring. Sometimes, the freshest available oils are from the southern hemisphere.
Read the entire article here: http://www.oliveoiltimes.com/olive-oil-basics/fresh-is-best/2014