They are referred to as deciduous.
Deciduous trees shed their leaves in the fall.
Deciduous trees loses their leaves in fall and regrow them in the spring.
Autumn or Fall as some countries call it. :)
Evergreen trees do not shed their leaves in the Autumn.
conifers
All deciduous trees shed annually, but some shed later in the year than others, such as the Blood-oak, which sheds it leaves in spring, instead of fall. Trees that do not shed their leaves annually are not deciduous.
deciduous forests
Trees that shed their leaves are called deciduous.
Autumn (fall) is the season when deciduous tree shed their leaves in the north.
deciduous trees shed their leaves in autumn. evergreen trees never shed their leaves.
Deciduous trees often don't shed their leaves in autumn if they are grown in warm or temperate climates. Evergreen trees retain thier leaves throughout the year.
The types of trees that are deciduous have leaves that shed every fall such as the maple tree.