Which type of fire hydrant is specifically designed for use in freezing temperatures?

A dry-barrel hydrant is specifically designed for use in freezing temperatures due to its unique construction that ensures the water supply does not freeze in colder climates. The design of a dry-barrel hydrant prevents water from being stored in the vertical section of the hydrant when it is not in use. Instead, it features a shut-off valve located below the frost line, so when the hydrant is shut off, the water drains out of the barrel, leaving it empty and protecting it from freezing.

In contrast, wet-barrel hydrants have water present in the barrel when not in use, making them unsuitable for areas where temperatures dip below freezing because the water can freeze inside the hydrant, rendering it inoperative. Plug-barrel and frost-barrel hydrants are not standard terms in hydrant designating and do not represent commonly recognized types of hydrants. Thus, the dry-barrel design is the clear choice for reliably operating in freezing temperatures without the risk of freeze-related damage.