Sheridan to Island Park Road Trip Guide

The 270-mile journey from Sheridan (44.7972° N, 106.9562° W) to Island Park (44.4230° N, 111.3683° W) is not a mere transit. It traces the footsteps of the Nez Perce along US-14 and US-20, crossing the Continental Divide at Sylvan Pass (8,530 ft). The road’s dramatic elevation changes—from 3,743 ft in Sheridan to 6,300 ft in Island Park—dictate a careful approach, especially in shoulder seasons.

This guide treats every mile as an opportunity for discovery, from Wyoming’s Bighorn Basin to Idaho’s volcanic calderas. We answer: is it worth driving Sheridan to Island Park? Emphatically yes, if you know where to pause.

Natural Landscapes: The Bighorn Mountains offer alpine meadows and glacial cirques. At Shell Creek Overlook (44.610° N, 107.287° W), you’ll see the Shell Valley sliced by US-14. Descending into Cody, the terrain shifts to arid badlands. Beyond Cody, US-20 enters the Shoshone National Forest—home of the Absaroka Range. Near Yellowstone’s East Entrance, Sylvan Pass (8,530 ft) provides views of the Grand Tetons on clear days. Final leg: Idaho’s Mesa Falls Scenic Byway (ID-47) features an 8,000-year-old basalt lava flow.

Local Commerce and Culture: In Cody, pause at the Buffalo Bill Center of the West (five museums under one roof). For authentic Western gear, visit Custom Cowboy Shop. Among how to find the best stops and hidden gems between cities, this route offers off-the-beaten-path gems like Thermopolis Hot Springs (25 mi detour from Greybull). In Island Park, Big Springs (the mouth of the Henrys Fork) yields 420 million gallons of water daily.

Roads & Highways: This route primarily uses two-lane highways: US-14 from Sheridan to Cody (via the Bighorn Mountains), US-20 from Cody to West Yellowstone, and ID-47 from Ashton to Island Park. The most scenic segment is US-14 over the Bighorn National Forest, where you’ll climb 5,000 ft in 30 miles. From Cody, US-20 follows the Shoshone River through Wapiti Valley, then skirts Yellowstone’s western edge.

• Key junction: US-14 and US-16 split at Greybull. Stay on US-14 for the direct route.
• Road condition updates: WYDOT 511 (Wyoming) and ITD 511 (Idaho) provide real-time alerts.
• Speed limits: 65 mph on highways, 45–55 mph in canyon sections.

Fuel and Route Economics: Fuel prices fluctuate significantly. As of 2025, expect • $3.50–$3.80/gal in Sheridan • $4.00–$4.30/gal in Cody (tourist premium) • $3.70–$4.00/gal in Island Park. Budget $55–$70 for a one-way fill-up (assuming 20 mpg). Electric vehicle charging: Level 2 chargers exist in Cody and West Yellowstone; Teslas can use Superchargers in Sheridan and Idaho Falls (40 mi detour).

• Critical fuel stop: Greybull (mile 50) before entering the Bighorns.
• Next reliable fuel: Cody (mile 120) – 70 miles between.
• Alternative: Basin, WY (US-20) for premium fuels.

Safety & Road Quality: US-14 through the Bighorns has narrow shoulders and sharp curves. Watch for livestock on open range near Lovell. US-20 west of Cody has occasional rockfall. Winter (Nov–Apr): chains required over Sylvan Pass; US-14 may close for hours after snowfall. Summer: construction delays possible. Use headlights at all times as per Wyoming law.

• Emergency services: Cody Regional Medical Center (307-578-2000); tow trucks available in Cody and West Yellowstone.
• Cell service: Spotty in Bighorn National Forest; Verizon and AT&T work near towns.

Family and Child Suitability: This drive is excellent for families with school-age children (ages 6+). Educational stops: Cody’s Yellowstone Originals Rodeo (June-August), and the Grizzly & Wolf Discovery Center in West Yellowstone. Kid-friendly hikes: trail to Shell Falls (0.5 mile paved), or the boardwalk at Mesa Falls. Pit stops with playgrounds: Days Inn in Cody; KOA in West Yellowstone.

Pet-Friendly Framework: Most National Forest trails allow leashed dogs. Pet relief areas at rest stops: Shell Creek Rest Area (muzzle-free zone) and Wapiti Rest Area (picnic tables). Dog-friendly lodging: Best Western Sheridan Center; Holiday Inn West Yellowstone (pet fee $25). Avoid pets on the Sylvan Pass corridor due to wildlife (bison, bears).

Fatigue Management & Rest Zones: Plan stops every 90 minutes. Scheduled rest areas: • Shell Creek Rest Area (mile 65) – restrooms, picnic tables • Wapiti Rest Area (mile 130) – exhibits on Shoshone River • West Yellowstone Visitor Center (mile 225). Alternative: pullouts on US-20 near the Idaho border. Minimum break time: 15 minutes each.