Wandering Western Terrestrial Garter Snake (Thamnophis elegans vagrans); FSR 370, near Bear Saddle Peak, N of Warm Springs Creek, Bitterroot NF, Bitterroot Mountains, SW of Sula, MT
Hard to see in these pictures. Saw several fast moving snakes, probably 3 ft or more in length. Dark with yellow stripes running lengthwise along the body. Red spots on dark parts of the body.