Plan around the shoulder months of May, June, September, and October: rural-house rates dip after the August Spanish holiday peak, mountain trails are open, and midday heat is manageable. July and August book up early and rural cottages can double in price; winter is cold at 700 m elevation and many rural lodgings close between November and March.
Budget leverage comes from Extremaduran food culture and free nature. The menú del día at village restaurants between 14:00 and 16:00 is the day's best value, while Sierra de Gredos hiking, the historic center, mountain miradores, and Iglesia de San Andrés cost nothing. The main splurge to budget for is a rental car collected in Plasencia, since public transport to and around Acebo is limited.