You can plant trees in winter in certain areas. In general, if the ground is diggable in your area you can still plant most types of trees. Learn about which trees to plant in winter, planting by growing zone, and tips for winter planting.
10 Trees and Plants That Bloom in Winter
Can I Plant Trees in Winter?
Can You Plant Trees in the Winter?
Wisconsin Snowstorm Effects on Trees
Keeping Shrubs & Trees in Planters Alive Through the Winter
When is Spring? Indiana birds, plants prepare for winter to end
Why Don't Trees Freeze? - For The Love Of Trees, LLC : For The Love Of Trees, LLC
A Look at the Deciduous and Evergreen Trees at My Farm - The Martha Stewart Blog
Why You Should Plant Trees in Fall & Winter — Nashville Tree Conservation Corps