From the Arcadia Parks Committee:

The Tree Baltimore giveaway this year is at Snug Books 4717 Harford Rd . It is scheduled for Thursday, May 23 from 4-7. This is a great chance to stop by and see what is available and get recommendations for a tree that will do well for the conditions in your yard. You can also pre-order a tree directly from TreeBaltimore.

The online store is now populated with a diverse listing of native tree species. These are seedlings in 1-3 gallon plastic pots between 18-36 inches. Some are evergreen, some are small
flowering, some are fruiting, and some are long-lived, large shade. Up to two per household.
For a full listing of tree species and pick up locations, visit the online store.