Des Moines to Keystone Road Trip: Scenic Drive Across the Plains

This 640-mile drive from Des Moines, IA to Keystone, SD takes you along Interstate 29 north and Interstate 90 west. The Missouri River crossing at Sioux City marks a historic gateway to the Great Plains. Driving time is about 9 hours without stops, but the journey deserves at least two days.

The route passes through the unique Loess Hills, a rare wind-deposited landform, and ends near the iconic Mount Rushmore. Understanding the landscape and logistics helps you make the most of this trip.

Interstate 29 from Des Moines to Sioux City is a well-maintained four-lane highway. After crossing into South Dakota, I-90 runs straight west across the plains. The entire route is paved with ample rest areas.

• Gas stations appear every 30-50 miles, but between Chamberlain and Wall, services are sparse. Fill up in Chamberlain or Murdo.
• Average fuel cost for a sedan: about $80 one-way at $3.50/gallon.
• Tolls: None on this route.
• Best seasons: Late spring (May-June) and early fall (September-October) for mild weather and fewer crowds.

Cell phone coverage is generally good along the interstates, but can drop in the Badlands region. Download offline maps for the stretch around Wall.

For those asking how long to drive Des Moines, IA to Keystone, SD, the pure driving time is 9 hours, but plan for 11-12 with stops.

Road quality is excellent, but watch for wildlife like deer and pronghorn, especially at dawn and dusk. The speed limit on I-90 is 80 mph in some areas, but adhere to conditions.

• Rest areas every 30 miles with restrooms and picnic tables.
• Fatigue management: Stop every 2 hours. Good stops include the rest area near Chamberlain and the one at the Missouri River.
• Family suitability: many child-friendly attractions like the Butterfly House in Sioux Falls and the Reptile Gardens in Rapid City.

Pet-friendly stops: Most rest areas allow dogs. The Badlands Loop Road permits leashed pets. Many hotels in Keystone accept pets.

Hidden off-route spots: The ghost town of Scenic, SD, 10 miles south of Wall, offers a glimpse of pioneer life. The Minuteman Missile NHS in Philip shows Cold War history.

The Loess Hills near the Iowa-South Dakota border offer panoramic views and hiking trails. Stop at the Loess Hills State Forest for a short walk.

• Missouri River overlook at Sioux City: good photo opportunity.
• Falls Park in Sioux Falls: a 123-foot waterfall in the city.
• Badlands National Park: dramatic eroded spires and fossil beds. Entry fee $30 per vehicle.

Local commerce includes the world's only corn palace in Mitchell, a quirky agricultural monument. In Wall, the famous Wall Drug store offers free ice water and endless gift shops.

While no UNESCO World Heritage Sites lie directly on this route, the nearby Loess Hills are a rare geological formation, and the Badlands are a national park of international renown. The how to find the best stops and hidden gems between cities guide can help you uncover more.

For culinary infrastructure, try a Bison burger at the Alumi Creek Bar & Grill in Interior, SD, or a classic steak at the Cattleman's Club in Wall.

• Iowa meatloaf and sweet corn in season.
• Indian tacos at the Prairie Edge Trading Co. in Rapid City.
• Local craft beer: WoodGrain Brewing in Sioux Falls.