Many cattle producers can take advantage of the late summer-fall growing conditions to obtain high-quality pasture for fall and early winter grazing. This practice is called stockpiling. Management decisions for optimum stockpiling include selecting grass species, timing, fertilizing, grazing management or utilization, selecting classes of cattle, and designing grazing systems for efficient utilization. The most important thing though is to cut or graze the pastures you want to stockpile in early to mid-August and then let them rest until late this fall.
Find this publication at the UK Forage website under the “Grazing” tab or go directly to the link https://forages.ca.uky.edu/grazing.