From SFEnvironment.org: How do I recycle my Christmas tree in San Francisco?
To get rid of your Christmas tree, please place clean, unflocked trees next to your bins on your regular service day between Wednesday, January 2 through Friday, January 11, 2019.
If you missed your collection date, please contact Recology by calling (415) 330-1300.
Be sure to remove all tinsel, decorations, plastic bags, stands, and lights. If your tree measures more than 6 feet tall, please cut it in half before putting it on the curb. Please note that a separate Recology truck will pick up trees and may not pick up Christmas trees at the same time as the compost bin. Please contact Recology if your tree is not picked up by the end of the day on your regular service day.