Dry. Hang long stems upside down in a dark area with good air circulation. Smaller stems can be placed on screens. Remove leaves from the stem once fully dry and store in an airtight container for up to 6 months.
Freeze. Rosemary can be frozen, although some loss of color may occur. Place whole sprigs on a cookie sheet that has been covered with waxed paper. Once frozen, strip off the leaves and store in an airtight container for up to 1 year.
Freezing in Oil. Strip the leaves of the stem and place in ice cube trays. Fill cubes ¾ full with desired olive oil. Once frozen, pop out of the trays and store in an airtight container for up to 1 year.