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“Olgreen” (Scale cereal L.), a new rye variety was developed by National Institute of Crop Science(NICS), RDA. It was released in 2008 because of its high biomass yield potential and early maturity. It was developed from an open pollination within 10 rye varieties or lines including “Chochun” in 1995. The line ‘SR95POP-S1-1072-1-2-4’ was selected for its early maturity and excellent agronomic appearance, and placed in yield trials for two years from 2004 to 2005. It was designated “Homil 38” and placed in regional yield trials at the four locations around Korea from 2006 to 2008, from which the name “Olgreen” was given. Over three years, “Olgreen” averaged 8.88 ton ha-1 of forage yield (based on dry matter) harvested at late April and superior to other varieties with an increase of 10% more than the check variety “Olhomil”, and 9% more than the introduced rye “Koolgrazer”. Heading date of “Olgreen” was April 20 which was 3 days earlier than that of “Olhomil”. It would be recommended as an early rye variety for forage or green manure in South Korea.