Okoboji to Custer: The Ultimate Road Trip Guide

This route follows US-71 north to I-90 west, a corridor that passes through the glacial terrain of northwest Iowa and the rolling plains of South Dakota. The drive is 330 miles and typically takes 5 hours without stops.

You'll climb from Iowa's highest natural point (1,670 feet near Hawkeye Point) to the Black Hills' 7,242-foot Harney Peak, now named Black Elk Peak. The transition is gradual but visually striking.

The journey crosses the Missouri River at Sioux City, where Lewis and Clark camped in 1804. Today, the river marks the boundary between the Midwest and the West.

As you approach the Badlands, the terrain shifts to stark, eroded buttes—a precursor to the pine-covered slopes of Custer State Park.

Interstate 90 is one of America's safest highways, with a wide median and clear signage. However, strong crosswinds can affect high-profile vehicles, especially between Mitchell and Chamberlain.

For families, the route offers numerous interactive attractions: the Mitchell Prehistoric Indian Village (archaeological dig site), the Badlands' fossil trail, and in Custer, the Wildlife Loop Road where you can see bison, burros, and pronghorn up close.

Rest areas are spaced 30-50 miles apart; use the 20-20-20 rule: every 2 hours, stop for 20 minutes, and look 20 feet away to reduce eye fatigue.

If you need a longer break, the town of Kadoka (Exit 150) has a KOA campground with a pool.

Pets are allowed at most rest areas on a leash, and many hotels in the region are pet-friendly. Custer State Park's campgrounds have designated pet areas.

Safety-wise, watch for deer and other wildlife during dawn and dusk, especially from Wall to Custer—the area has a high population of mule deer.

In the Black Hills, mountain goats are occasionally seen near the Needles Highway.

For emergencies, cell coverage is absent in the Badlands; carry a physical map and a first-aid kit.

Iowa's portion is characterized by rolling farmland dotted with glacial lakes. The Iowa Great Lakes region around Okoboji has 13 lakes formed by retreating glaciers 12,000 years ago.

Once in South Dakota, the landscape flattens into vast prairie. The town of Mitchell is home to the Corn Palace, a Moorish Revival building decorated with corn mosaic murals—a quirky agri-culture landmark.

The Badlands National Park, accessible via an exit at Cactus Flat (Exit 110), features rugged rock formations that are paleontological hotspots. Over 30 million years ago, this was a prehistoric reef.

Wall's famous drugstore, Wall Drug, started in 1931 as a struggling pharmacy; free ice water attracted travelers, and now it's a sprawling western-themed mall.

For local food, try chislic in South Dakota—cubed meat, often lamb, that's deep-fried. In Custer, visit the Custer County 4-H Grounds for local events, or the Custer City Bakery for pastries since 1909.

The how to find the best stops and hidden gems between cities guide offers strategies for uncovering such local spots.

Interstate 90 is the spine of this trip, offering four-lane divided highways from Sioux Falls to Rapid City. The speed limit is 80 mph in South Dakota, and the road is well-maintained year-round.

• Fuel prices average $3.20/gallon in Iowa, $3.10 in South Dakota (check current rates)
• Rest areas every 50-60 miles with clean restrooms and picnic tables
• I-90 is toll-free
• Expect construction zones during summer months

After exiting at Custer, Highway 16A becomes the Needles Highway, a scenic byway with narrow tunnels and granite spires. This road is not suitable for large RVs—check the 13-foot height limit at the tunnels.

For navigation, GPS apps work well, but download offline maps because some stretches have no cell service, especially in the Badlands and Custer State Park.