A review of sudden aspen decline will illustrate anticipated impacts of climate change on forests.  Bioclimate modeling will be briefly introduced as a means of approximately quantifying and mapping those impacts.  These models, optimized for a local planning area such as a national forest, can be used as part of a practical strategy of adapting forests to climate change, allocating treatments where they will be most efficient and effective into the foreseeable future.  A case study of aspen and spruce in southwestern Colorado will illustrate the strategy.