Yes, and the season is winter.
The difference between deciduous trees and fir trees is that deciduous trees lose their leaves while fir trees do not. Deciduous trees usually lose their leaves during winter, but some in the tropics lose their leaves during the dry season.
Trees may loose their leaves during periods of drought, as a result of herbivorous attacks or, in temperate climates, they may lose them in the autumn season.
winter
Deciduous means losing their leaves, not persisting beyond one season.
Autumn (fall) is the season when deciduous tree shed their leaves in the north.
Autumn.
Autmun
Autumn.
Deciduous trees.
Trees that drop their leaves for winter are in a group called "Deciduous".
These are called deciduous trees. Trees that keep their leaves in winter are called coniferous. Most coniferous trees have needle leaves and cones. Deciduous leaves vary in shape and size but most trees that don't have a needle shaped leaf are deciduous trees.
I presume you mean leaves. All deciduous trees lose their leaves in winter.