Green Bay to Iowa City Road Trip Guide: Best Stops & Hidden Gems

This 280-mile journey from Green Bay, WI to Iowa City, IA follows US-151 and US-151 Business, tracing the historic Lincoln Highway corridor. The route crosses the Wisconsin River southwest of Madison and the Mississippi River at Dubuque, IA—the only place where the Mississippi runs east-west.

Driving time is approximately 4.5 hours without stops, but this how to find the best stops and hidden gems between cities guide will double your adventure time.

US-151 is a well-maintained four-lane divided highway from Green Bay to Madison, then undivided segments through rural Wisconsin and Iowa. Construction zones are common near Sun Prairie. Gas stations cluster every 30 miles, but fuel up in Madison (mile 120) or Dubuque (mile 200) for best prices.

• Green Bay, WI (start) – fuel average $3.50/gal
• Madison, WI (mile 120) – fuel average $3.40/gal
• Dubuque, IA (mile 200) – fuel average $3.30/gal
• Iowa City, IA (end) – fuel average $3.35/gal

Toll roads: None. Rest areas: Wisconsin rest stops at mile 75 (near Beaver Dam) and Iowa rest area at mile 215 (Dubuque South). Overnight parking allowed at most Walmart stores; the Madison East Walmart (mile 115) is RV-friendly.

Crash rates are low on US-151; the highest risk areas are at-grade intersections in small towns (e.g., Waupun, mile 80). Use high beams in rural segments. Cell coverage is solid except a 15-mile dead zone near the Wisconsin-Iowa border (mile 190).

• Family stop: Storybook Gardens in Appleton (mile 20) – free, open May–Oct
• Pet stop: Dog Park in Madison's Olin Park (mile 120) – off-leash area
• Fatigue break: Rest area at Iowa Welcome Center (mile 215) – 24-hour facilities

Hidden off-route spot: The abandoned Rountree Bridge (mile 175, near Platteville) is a 1930s steel truss bridge accessible via a short gravel road. For culinary infrastructure, the how to find the best stops and hidden gems between cities method led us to the Q Shack in Madison (mile 115), known for cherrywood-smoked brisket.

The route traverses the glaciated Driftless Area after Dubuque, carving dramatic limestone bluffs. Horicon Marsh (mile 90) is a 33,000-acre freshwater wetland, a UNESCO-designated Biosphere Reserve. Stop at the Horicon Marsh Education and Visitor Center for elevated boardwalks.

• Horicon Marsh National Wildlife Refuge – free, open dawn-dusk
• Scenic overlook at Sinsinawa Mound (near Dubuque) – mile 195
• Lake Kegonsa State Park (south of Madison) – mile 130, entrance $11

Local commerce thrives in small towns: Poppy's Coffee Co. in Monroe (mile 160) sells farm-to-cup brews; The General Store in Mineral Point (mile 170) stocks Wisconsin cheese curds. The New Glarus Brewing Company (mile 150, detour 5 miles) offers free self-guided tours.