Lincoln Christmas Tree Collection Email Compost your Christmas tree! You can drop off trees at the Lincoln Airport at 1420 Flightline Drive (the open field adjacent to the airport) between December 26, 2019 and January 5, 2020. All lights and ornaments must be removed. No flocked or painted trees will be accepted. You can also place Christmas trees in green waste containers if all lights and ornaments have been removed and the tree is cut to 4 feet or smaller. No flocked trees will be accepted. All trees put in green waste will be composted.