Zone 21A is a smaller subdivision of the lower Lemhi country, focused on the eastern slope of the Beaverhead Mountains north of Salmon. Elevations run from about 4,000 feet on the Salmon River to over 10,000 feet on the divide. The valleys are sage and bunchgrass; the mid-slopes carry mountain mahogany, juniper, and aspen; the high country has doug fir, lodgepole, and limber pine with alpine meadows above timberline. This is dry, open mule deer country first—the kind of place where you glass for hours from a single ridge. Salmon-Challis National Forest and BLM share the public ground, with private ranch holdings concentrated in the Lemhi Valley. Highway 28 runs the valley; forest roads climb both sides into the mountains, varying from decent gravel to genuine four-wheel-drive tracks. Salmon has full services; North Fork upstream has fuel and a small store. Cell service follows the highway and dies in the canyons. The mahogany-aspen transitions hold mature mule deer bucks that almost nobody hunts because access is physical—you typically climb 2,000 vertical feet before you start seeing animals. Elk numbers in the higher timber have grown, and a few sheep tags exist for the patient. October weather is high-desert continental: warm days, hard frosts, and snow possible at elevation by the third week.