From a friend who works there:
Our birds would appreciate your old Christmas Tree! Drop off any day of the week from 8 am until sunset. Simply line the Aviary fence at Tuckahoe State Park’s office (12282 Eveland Road, Ridgely). Discarded trees will be used as windbreaks for our Scales & Tales critters and then in the spring they will be used for fish habitat and trail mulch. Thanks for your donations and help!