Wayne Bowman, Hunt County Master Gardener, says trees can be planted year round if they are planted from containers, with "ball roots" (covered with soil). The hole should be about three times the size of the ball. Wayne also says leaves should be raked into flower beds and gardens rather than bagged and sent to the landfill.
Trees (With Ball Roots) Can Be Planted Year-Round In NE Texas

Texas A&M Agrilife