Christmas Tree Disposal in Hamilton This Weekend This is the weekend that Hamilton residents can dispose of their (formerly) live Christmas trees. The City of Hamilton and Bitterroot Disposal have teamed up again to provide dumpsters at the city parking lot north of the Hamilton U.S. Post Office, where people can bring their previously decorated trees. Hamilton Mayor Dominic Farrenkopf said the service is for Hamilton city residents and is definitely NOT for artificial trees. Why? Because the trees will be mulched up and used for agricultural needs in the valley. There's enough plastic in the world without adding artificial trees to the disposal effort.