In what situation would cool-season grasses thrive best?

Cool-season grasses thrive best in mountainous regions due to the climate conditions typically found at higher elevations. These areas often experience cooler temperatures and more moisture, particularly during the spring and fall, which aligns with the growing requirements of cool-season grasses. These grasses, such as Kentucky bluegrass and fescue, prefer temperatures between 60 to 75 degrees Fahrenheit and generally do not perform well in hot, dry conditions.

The other options do not provide the ideal growing environment for cool-season grasses; coastal plains may experience higher humidity and heat, which favors warm-season grasses. Humid and shaded areas can lead to excess moisture that is not ideal for all cool-season grasses, and excessively dry areas are generally unsuitable for their growth as these grasses need consistent moisture to thrive. Thus, mountainous regions present the most favorable conditions for cool-season grasses.