Ketchum to Riverton: Epic Idaho-Wyoming Road Trip Guide

The drive from Ketchum, Idaho to Riverton, Wyoming spans 320 miles along US-20, US-26, and US-287, crossing the Continental Divide twice and traversing the Snake River Plain, the Teton Basin, and the Wind River Range. A little-known fact: this route shadows the historic Oregon Trail in places near Guernsey, Wyoming, where wagon ruts are still visible. The journey takes approximately 5.5 hours of pure driving time, but plan for 7-8 hours with stops. This guide answers how to find the best stops and hidden gems between cities while ensuring you experience the best stops Ketchum, ID to Riverton, WY has to offer.

Natural Landscapes & Attractions

The route transitions from the sagebrush steppe of Idaho to the alpine grandeur of the Tetons, then to the red desert of Wyoming. Key stops: Craters of the Moon National Monument (near Arco, ID), with its volcanic lava tubes and cinder cones. Grand Teton National Park (near Jackson) offers iconic mountain views and wildlife. The Wind River Range near Dubois features the largest glaciers in the US Rockies outside Washington.

• Craters of the Moon: hike the Inferno Cone for 360-degree views.
• Grand Teton: drive the Jenny Lake Loop for moose sightings.
• Wind River Indian Reservation: stop at Fort Washakie to see tribal history.

UNESCO World Heritage Sites

The nearest UNESCO site is Yellowstone National Park, accessible via a detour from West Yellowstone (100 miles north of Idaho Falls). However, the route itself passes the Idaho National Laboratory (INL) and Experimental Breeder Reactor I, a National Historic Landmark and part of the Manhattan Project. While not a World Heritage Site, it offers unique insight into nuclear history.

For a truly UNESCO experience, consider a 2-hour detour to Yellowstone's Grand Prismatic Spring and Old Faithful. The hot springs and geysers are peerless.

Local Commerce & Culture

Ketchum’s economy revolves around Sun Valley Resort and outdoor recreation. In Idaho Falls, the River Walk along the Snake River features local shops and breweries. In Jackson, the town square is surrounded by art galleries and cowboy culture. Riverton, the home of Central Wyoming College, has a growing arts scene and the Wind River Hotel and Casino.

• Art galleries in Jackson: 20+ along Center Street.
• Farmers market in Idaho Falls: Saturdays in summer.
• Riverton’s historic downtown: boutiques and the Riverton Museum.

Culinary Infrastructure

Food options vary widely. Ketchum offers upscale dining like The Grill at Knob Hill. Idaho Falls has family-friendly chains and local diners (Cracker Barrel, Jakers). Jackson is a foodie destination with Snake River Grill for game meat. In Dubois, the Cowboy Café serves hearty breakfasts. Riverton has classic Wyoming fare: bison burgers at The Breadboard.

• Breakfast: Cowboy Café, Dubois (open 6am-2pm).
• Lunch: Pickle’s Place, Arco (famous for huckleberry shakes).
• Dinner: Snake River Grill, Jackson (reservations recommended).
• Snacks: Huckleberry products at gas stations in Idaho.

Climatic Conditions & Route Aesthetics

Summer (Jun-Aug): 70-85°F afternoon thunderstorms possible. Fall (Sep-Oct): crisp air, golden aspens near Jackson. Winter (Nov-Mar): heavy snow in passes, temps -10 to 20°F. Spring (Apr-May): mud and road closures. The best aesthetics come in late September when the Cottonwoods turn yellow along the Snake River. The Teton Pass often has snow into June, so check conditions.

• Summer: start early to avoid thunderstorms.
• Winter: carry chains and an emergency kit.
• Spring: expect construction delays.

Fuel and Route Economics

Gas stations are plentiful in Ketchum, Hailey, and along I-15 near Idaho Falls, but become sparse between Dubois and Riverton (about 100 miles without services). Fill up in Dubois, WY. Average gas prices in 2024: $3.50/gal in Idaho, $3.70 in Wyoming. Toll roads: none. Food costs range from $10–20 per meal at diners. Bring cash for small-town cafes that may not accept cards.

• Fill tank in Ketchum before heading east.
• Next reliable fuel: Idaho Falls (mile 120).
• Then Jackson (mile 210) or Dubois (mile 260).
• Arrive in Riverton with half tank or refuel there.

Key Highways and Mile Markers

US-20 east from Ketchum to Idaho Falls (mile 0-120). Then US-26 east to Jackson (mile 120-210). Finally US-287 south to Riverton (mile 210-320). Watch for road construction near Teton Pass in summer. Winter requires 4WD or chains. The highest point is Teton Pass at 8,431 feet.

1. Ketchum to Carey: 50 miles, open plains.
2. Carey to Arco: 40 miles, lava fields.
3. Arco to Idaho Falls: 30 miles, irrigated farmland.
4. Idaho Falls to Swan Valley: 50 miles, Snake River canyon.

Infrastructure Safety & Road Quality

US-20 and US-26 are well-maintained two-lane highways with wide shoulders. US-287 from Jackson to Riverton has some winding sections and wildlife crossings. Use caution at dusk for deer and antelope. Snow removal is efficient in Wyoming. Mobile coverage is spotty between Arco and Idaho Falls, and between Dubois and Riverton; download offline maps.

• Wildlife zones: near Teton Pass and Wind River areas.
• Road quality: good overall, potholes possible in early spring.
• Emergency services: call 911; nearest hospitals in Idaho Falls and Riverton.

Family and Child Suitability

This road trip is excellent for kids with stops at Craters of the Moon (lava tubes and visitor center), Idaho Falls Zoo at Tautphaus Park, and the Jackson Hole Rodeo (summer evenings). In Riverton, the Wyoming State Museum and Sinks Canyon State Park offer educational hikes. Restrooms are available at most gas stations and state parks.

• Kid-friendly: Craters of the Moon Junior Ranger program.
• Rodeo: Jackson Hole Rodeo on Wednesdays and Saturdays.
• Parks: Mike Sedar Park in Riverton has playgrounds.

Pet-Friendly Framework

Most hotels in Ketchum, Jackson, and Riverton accept pets (check for fees). Pets are allowed on leashes in national forests and many trailheads. In Grand Teton NP, pets are restricted to paved roads and parking lots. Craters of the Moon allows leashed pets on trails. Bring water and poop bags; Idaho rest stops have pet areas.

• Pet-friendly lodging: Motel 6 in Idaho Falls, Super 8 in Jackson.
• Veterinarians: Idaho Falls Animal Hospital (208-529-1058).
• Trail restrictions: no pets in backcountry of Grand Teton.

Hidden Off-Route Spots

Lesser-known gems include the Shoestring Lavender Farm in Carey (5 miles south of US-20) with lavender fields and a gift shop. The EBR-I museum in Arco (open summer only) lets you see the first reactor to generate electricity. Near Dubois, the Tie Hack Interpretive Trail tells the story of railroad tie hacks. And just north of Riverton, the Castle Gardens Petroglyph Site features 1,000-year-old rock art.

• Shoestring Lavender Farm: best in June-July bloom.
• EBR-I: free entrance, 15-minute film.
• Castle Gardens: requires a short unpaved road; bring bug spray.

Fatigue Management & Rest Zones

Plan stops every 2 hours. Key rest areas: US-20 east of Carey (rest area with tables), Idaho Falls at the Snake River Greenbelt (benches and river views), Jackson at the National Wildlife Refuge Visitor Center (free and quiet), and Dubois at the Pioneer Museum (small exhibits and clean restrooms). The Wyoming Welcome Center in Evanston is another option if detouring.

• Rest stop Carey: mile 55, picnic tables, no water.
• Idaho Falls Greenbelt: mile 120, walking paths and cafes.
• Dubois Pioneer Museum: mile 260, open 9am-5pm.
• Riverton rest area: mile 320, clean and modern.