The Summerland Valleys sub-GI is an area of approximately 3336 acres in the higher elevation and cool climates of Prairie Valley and Garnet Valley above Summerland. The south-eastern portion of the sub-GI near Prairie Valley shares a border with the Summerland Bench sub-GI. Elevation ranges from 500 to 700 metres making this area home to some of the highest vineyards in the Okanagan.
Due to elevation this is a distinctly cool climate sub-GI with a recently established weather station in Garnet Valley reporting 1167 (2018) and 1135 (2019) GDD.
Glaciation has produced many different soil types with 10 soil series present in the sub-GI. These have formed from a variety of parent materials: wind-blown fine sands overlying glacial till, gravelly and/or sandy glaciofluvial deposits (glacial meltwater), silty glaciolacustrine (lake bottom) deposits, recent stream deposits and the decomposed organic materials making for a complex mix of terroirs.
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