subalpine
adjective
sub·al·pine ˌsəb-ˈal-ˌpīn 
1
: of or relating to the region about the foot and lower slopes of the Alps
2
: of, relating to, or inhabiting high upland slopes and especially the zone just below the timberline
Example Sentences
Recent Examples on the Web Fine-dining time Rupert’s at Hotel McCall, 1101 N. 3rd St., is one of the most popular dining destinations around these subalpine parts. 
James Patrick Kelly, idahostatesman, 18 Jan. 2018 The tribes seek to change the name of Hayden Valley, a subalpine valley just north of Yellowstone Lake, to Buffalo Nations Valley. Washington Post, 12 Sep. 2017
James Patrick Kelly, idahostatesman, 18 Jan. 2018 The tribes seek to change the name of Hayden Valley, a subalpine valley just north of Yellowstone Lake, to Buffalo Nations Valley. Washington Post, 12 Sep. 2017 Word History
First Known Use
circa 1656, in the meaning defined at sense 1