Larch-Tamarack

Lake Mcdonald, Glacier National Park

The last color change is when the larch trees (a deciduous conifer that loses its needles), mainly on the west side of the park, turns a gold color in mid October. Sometimes the best road for viewing the larches is on Hwy 2 around the southern boundary of the park.

https://glacierraftco.com/western-larch-in-the-fall/

Western Larch are one of the only deciduous cone-baring trees that lose their needles.  They are also highly sought out for firewood because they burn hotter and they are easy to split.  http://flatheadbeacon.com/2017/09/30/whats-name-larch-tamarack/

http://fwp.mt.gov/mtoutdoors/HTML/articles/portraits/tamarack.htm