Sheepherder Maximo Aranda led a band of 2,000 ewes and lambs who were unloaded at the Miller Gulch Trailhead on Wednesday.
Aranda led the sheep away from the trail to water on a fork of Crane Creek.
The sheep will be in the area of Corrals and Hard Guy trails for a couple of weeks, moving across the Foothills toward Bogus Basin and Boise National Forest land for the summer.
"This is good spring range," said Wilder rancher Frank Shirts. "This is good for the ground and good for fire danger."
Shirts, who has 12 bands of sheep - three grazing in the Boise Foothills - is one of the largest sheep operators in the West.
Hikers and cyclists might cross paths with sheep in the Foothills. Shirts recommends keeping dogs on leashes even on nonleash trails and walking bikes through the sheep to avoid conflicts with the white Great Pyrenees guard dogs.
Each band is usually protected from coyotes and other predators by two dogs. Shirts has one band of sheep already grazing near the motorcycle parking lot up 8th Street, headed toward Table Rock and Lucky Peak.