Simplot Hill is Boise's most beloved sledding hill — a long, steep grassy slope in the Highlands foothills on the northeast edge of the city, crowned by the enormous American flag that has become a Treasure Valley landmark. When snow falls on the Boise foothills, scores of families haul sleds and tubes up the hill for one of the great free winter traditions in the valley, carving runs down a pitch long and open enough to build real speed with a gentle runout at the bottom. Even in summer the hill draws sliders, who trade sleds for big blocks of ice and ride the dry grass under that unmistakable flag.

The hill is named for the late Idaho potato magnate J.R. Simplot, who bought this piece of the foothills in 1947 — the story goes for about five dollars an acre — and in 1979 built a Mediterranean-style mansion on top of it. His 30-by-50-foot flag, flown from a 200-foot pole, waved over the city for decades and still flies today, visible for miles across the valley. The mansion was demolished in 2016, and the property is being reborn as a public space, "JR's Park," carrying the hill's role as a community gathering place into its next chapter. Through all of it, the Simplot family kept the long-standing tradition of letting the public sled the slopes in winter.

Access is the thing to understand here: the hill sits on privately held land that has been generously opened to public sledding, not a formal city park with a plowed lot and restrooms. There is no fee, but there are also no facilities, no lifts and no supervision — it's a bring-your-own-everything outing. Park considerately in the surrounding Highlands neighborhood, respect any posted signs, and treat the ground and the flag with the same care that has kept the hill open to everyone for generations.

The slope is genuinely steep, which is exactly why it's fun and also why it deserves respect. Speeds at the bottom can be fast, the runout ends near neighborhood streets, and hard-packed or icy snow makes for a bruising ride, so helmets, a clear runout and an eye on younger sledders go a long way. Early mornings after a fresh snow bring the best surface and the smallest crowds; by afternoon on a good snow day the hill fills with families.

Come dressed for the Idaho cold in waterproof layers and sturdy boots, bring your own sled or tube (and a block of ice if you're chasing the summer tradition), and pack out everything you carry in. From the top, the reward beyond the ride is the view: the whole Boise valley spread out below, the flag snapping overhead, and a slice of the city's history under your sled.