What does a "frost pocket" refer to?

A "frost pocket" is a localized area where cold air accumulates, resulting in lower temperatures compared to surrounding areas. This is often due to physical features in the landscape, such as valleys or depressions, which trap cold air and can lead to frost formation. The protection from wind, along with the geography of the area, contributes to this phenomenon. It is especially important for gardeners and agriculturists to understand frost pockets, as they can significantly affect plant growth and pest dynamics.

The other options do not accurately describe a frost pocket. A region that is always cold suggests a more permanent state than is characteristic of a frost pocket. A sign of fungal infection is unrelated, as frost pockets concern temperature and microclimate rather than pathogens. Lastly, while frost damage may occur in a frost pocket, the term specifically refers to the microenvironment itself rather than the damage resulting from it. Thus, the choice that correctly captures the essence of a frost pocket is one that emphasizes the impacted area’s shelter from wind and its climatic implications.