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.
Can You Plant Trees in the Winter? - Scientific Plant Service
How to Bring Color and Life to your Northeast Ohio Winter Landscape - Independent Tree
How do I protect my trees and shrubs from winter damage?
Best Trees To Plant For Winter Color, Davey Blog
Ornamental and Landscape Trees Landing Page
Winter Flowering Trees
A Beginner's Guide to Identifying Trees in Winter
What Happens to Trees in Winter?
Winter and Trees: How Do Trees Survive Winter? - One Tree Planted
Planting Fall and Winter Trees (WFAA) - North Texas Municipal Water District
Winter Tree ID – Part 2 – Deciduous Trees