The straight-line distance between Denver, Colorado, and Green River, Wyoming, is 353 miles (568 km).
They sit 353 miles apart as the crow flies, stretching from Denver’s Civic Center Park to Green River City Hall.
Take I-80 westbound—it’s the fastest way, covering 382 miles in about 5 hours and 45 minutes to 6 hours and 15 minutes.
Yes. The US-287 to WY-789 route adds 13 miles but takes you through Medicine Bow National Forest, stretching 395 miles and taking roughly 7 hours and 15 to 7 hours and 45 minutes.
The drive is 29 miles longer than the air distance, thanks to the twists and turns of I-80.
Denver sits at 5,280 feet, while Green River climbs to 6,170 feet—a net gain of 890 feet. The highest point on I-80 near Sherman Summit hits 8,640 feet.
Yes, they share a 97-mile boundary along Wyoming’s southern edge.
It’s the county seat of Sweetwater County, one of Wyoming’s largest but least populated.
The Green River got its name from Spanish explorers in the late 1700s, who called it “Río Verde” for its green-tinged waters flowing from the Wind River Mountains.
The city was established in 1868 as a supply hub for the Overland Stage Line, then later became a key stop for the Union Pacific Railroad.
Denver’s story starts with the 1858 gold rush at Auraria and Cherry Creek, then boomed after rail connections to the transcontinental line in 1870.
Beyond passenger traffic, it’s a major freight route carrying crude oil, wind turbine blades, and intermodal containers—linking Wyoming’s Powder River Basin coal fields to West Coast ports.
Wyoming has just 2.4 people per square mile, according to the U.S. Census Bureau. Much of the state gets less than 12 inches of rain a year, so big farming isn’t practical.
Plan trips between May and September for the most reliable weather—clear roads and minimal wildfire smoke. Winter travel means preparing for possible closures at Sherman Summit.
Top off in Laramie (Milepost 311) or Walcott Junction (Milepost 366). Wyoming has fewer services than Colorado, so don’t wait too long between stops.
No formal inspections exist, but always carry valid ID. Utah Highway Patrol may conduct random sobriety or weight checks near the state line.
Within 40 miles, you’ll find Flaming Gorge National Recreation Area and Seedskadee National Wildlife Refuge—great for trout fishing, boating, and bird watching.
For real-time updates, visit the Wyoming Department of Transportation site or dial 511. Denver International Airport is 25 miles northeast of downtown Denver, while Rock Springs (RKS) is the closest commercial airport to Green River, 50 miles west, with daily flights to Denver via SkyWest/United Express.
Tom Bennett is a travel planning writer and former travel agent who has booked everything from weekend road trips to round-the-world itineraries. He lives in San Diego and writes practical travel guides that focus on what you actually need to know, not what looks good on Instagram.