A wall of real dinosaur bones — and deep river canyons across two states.
Photo: MJPlante1 · CC BY-SA 4.0 · via Wikimedia Commons
Dinosaur National Monument is really two parks in one, straddling the Utah–Colorado line. On the Utah side, near Jensen, the Quarry Exhibit Hall is built right over a tilted rock face studded with about 1,500 real dinosaur bones — eight species from the late Jurassic, roughly 150 million years old, Allosaurus and Stegosaurus and Apatosaurus among them — still embedded in the cliff, some close enough to touch. On the Colorado side, near the town of Dinosaur, there are no fossils at all: instead, the Harpers Corner road climbs to dizzying overlooks of the Green and Yampa River canyons.
That split is the single most important thing to know. The fossils are in Utah; the dramatic canyons are in Colorado; and the two visitor centers are about 30 miles and 40 minutes apart on US-40, with the Colorado side's 31-mile dead-end scenic road on top of that. Plan a day for each and choose based on what you came for. Beyond the headliners there's Fremont petroglyph rock art (easy to reach along Cub Creek), the river canyons at Echo Park and Split Mountain, and world-class whitewater rafting on the Green and Yampa.
It's high desert at about 5,000 feet — hot summers, cold winters, big day-night swings, and very little shade — so spring and fall are ideal and you carry water year-round. There's no lodge and no gas inside; fuel up and stay in Vernal, Utah (the practical base for the fossils) or Dinosaur, Colorado for an early canyon start.
Dinosaur is two monuments in practice, in two states, and the thing people get wrong is assuming they are one stop. The quarry with the fossil wall is on the Utah side; the canyon overlooks are reached by a 31-mile paved dead-end road from the Colorado side, whose visitor center is about 40 minutes east by highway. Both are worth the drive and they are not the same day.
Thirty-one miles of paved road running north from the Canyon Visitor Center near Dinosaur, Colorado, out along a high ridge to the Harpers Corner trailhead. It is a dead end — you drive it out and back — and it is where the canyon country actually reveals itself.
In from Jensen, Utah, on UT-149 to the Quarry Exhibit Hall, where the fossil-bearing rock face is enclosed in a building. Short, easy, and a completely different visit from the Colorado side.
The highway linking the Utah and Colorado ends of the monument. It is about 29 miles and 40 minutes from the Quarry Visitor Center to the Canyon Visitor Center — south to Jensen, then east across the state line — and Vernal, where most people sleep, is 19 miles the other way. Then Harpers Corner Road is another 31 miles out and 31 back on top. That is the arithmetic that turns this into two days.
Closed to vehicles roughly 31 December to 15 April, weather permitting; the first five miles to Plug Hat Butte stay plowed
Climbs onto a ridge between the Green and Yampa canyons with pull-offs looking down into both. Because it dead-ends you drive it twice, so budget the full sixty-two miles rather than the thirty-one on the sign.
TipThe last stretch and the two-mile round-trip trail at the end are the payoff — do not turn around early. There are no services on the road at all, and the unpaved side roads off it turn to slick clay when wet.
Runs east from the quarry past Fremont petroglyph panels to the Josie Morris cabin at the end. Paved for the first eight miles and gravel for the last two, easy in any car in dry weather, and the reason to allow more than an hour on the fossil side.
The signature stop — a glass building over a cliff face holding ~1,500 real Jurassic dinosaur bones still in the rock, some you can touch.
Insider tipAll the fossils are on the Utah side (near Jensen). In summer the park asks you to ride the free shuttle up from the visitor center because the Exhibit Hall lot is tiny; out of season you drive yourself. Anyone with mobility needs may drive up any time of year, and you can always walk the Fossil Discovery Trail instead — 1.2 miles each way.
Plan a trip to this spot →A ~31-mile paved drive along the canyon rim to overlooks of the Green and Yampa River canyons — all scenery, no fossils.
Insider tipAllow a half-day round trip and fuel up first — there are no services on the road, and the nearest are in Dinosaur, two miles west of the visitor center. The Harpers Corner Trail at the end is two miles round trip along a narrow ridge to a point 2,500 feet above the Green River in Whirlpool Canyon.
Plan a trip to this spot →The spectacular confluence of the Green and Yampa rivers beneath towering Steamboat Rock, at the end of a 13-mile unpaved road off Harpers Corner Road.
Insider tipHigh-clearance with all-wheel drive is strongly recommended and RVs and trailers are not allowed; the clay road is impassable when wet — check conditions and never go in when rain threatens. The easy 1.25-mile Confluence Trail starts from the campground.
Plan a trip to this spot →Where the Green River saws through Split Mountain — a riverside campground, boat launch/takeout, and easy nearby trails.
Insider tipA good family base near the Quarry, with river access and the Sound of Silence and Desert Voices trails close by.
Plan a trip to this spot →Ancient Fremont rock-art panels along the Cub Creek road past the Quarry, plus the historic Josie Morris homestead cabin.
Insider tipCub Creek is the easy way to see rock art — paved for the first eight miles, gravel for the last two out to Josie Morris's cabin. Bring binoculars for the high panels.
Plan a trip to this spot →A dramatic canyon mouth where the Green River plunges into the Canyon of Lodore — a trailhead, campground, and classic rafting put-in.
Insider tipVery remote — about 90 miles from Dinosaur, CO by way of US-40 and CO-318, with the last stretch on gravel — so it is mainly for rafters and solitude-seekers.
Plan a trip to this spot →High desert at about 5,000 feet: hot summers (July highs near 90°F), cold winters, and a big daily swing (often 35°F+) with very little rain (~9 inches a year). There's little shade, so carry water — and bring a layer even in summer for the cold mornings. Spring and fall are the most comfortable; winter closes the canyon-side back roads.
Two entrances in two states, about 30 miles apart on US-40 — pick by fossils vs. canyons.
Off US-40 at Jensen, UT (~20 min from Vernal) via UT-149 to the Quarry Visitor Center — the Quarry Hall, Cub Creek petroglyphs and Split Mountain. This is the monument's only fee station; the pass you buy here covers both states.
Near Dinosaur, CO off US-40 — the Canyon Visitor Center sits two miles east of town, and Harpers Corner Road runs north from there. No fossils on this side, and no entrance station either. It is about 30 miles and 40 minutes east of the Utah quarry — Vernal is in the opposite direction.
No lodge inside — campgrounds in the park, hotels in the gateway towns.
Green River is the main one, on the Utah side near the Quarry ($24 a night, open roughly early April to late October). Split Mountain next door takes group bookings in summer and individual sites in winter, and there are small remote campgrounds at Echo Park, Gates of Lodore, Deerlodge Park and Rainbow Park ($12–$14, first-come apart from the Echo Park group site). Green River's A and B loops are reservable on Recreation.gov in season; the rest are first-come.
Booking tipGreen River is the easy family and RV pick by the river. Camping fees are separate from the entrance pass.
About 20–30 minutes from the Quarry, with the most lodging, dining, and services — and dinosaur museums.
Booking tipThe best base for the fossil side.
A very small town at the Colorado entrance — limited services, convenient only for an early Harpers Corner start.
Booking tipLarger options are in Rangely or Craig, CO.
How much is the entrance fee?
$25 a vehicle for seven days, $20 for a motorcycle, $15 per person 16 and over on foot or bike; under 16 go free. A Dinosaur annual pass is $45, and the $80 America the Beautiful pass works. The Quarry Entrance Station on the Utah side is the only fee station — there is none on the Colorado side — and the pass covers the whole monument, both states. It does not cover camping or river permits, which are billed separately.
Which side has the dinosaurs?
The Utah side. All the fossils — including the Quarry Exhibit Hall — are near Jensen, UT. The Colorado side (near Dinosaur, CO) is canyon-and-river scenery only, no fossils. The two visitor centers are about 40 minutes apart, but Harpers Corner Road adds a 62-mile round trip, so plan roughly a day per side.
How do I see the Quarry?
Start at the Quarry Visitor Center on the Utah side. In summer the park asks everyone to ride the free shuttle up to the Exhibit Hall, because the lot up there holds very few cars; when the shuttle isn't running you drive your own vehicle. Visitors with mobility needs can drive up in any season, and the Fossil Discovery Trail walks you there in 1.2 miles if you'd rather hike it.
When should I go?
Spring and fall for mild weather. Summer is hot but the enclosed Quarry and the rivers help; winter is cold with reduced services and the canyon-side roads closed.
Do I need a permit to raft?
Yes — private trips on the Green and Yampa require a competitive lottery permit through Recreation.gov, booked far ahead. The easier route is a licensed commercial outfitter, who handles the permit.
Are there services inside?
No gas, food, or stores inside the monument. Fuel up and stock water in Vernal, UT or in Dinosaur, CO before you go. Cell service is spotty and disappears entirely on the back roads, so download your maps first.
Nearest other guides: Arches National Park · Moab · Park City
Pick your vehicle, line up the stops on the way in and out, and carry the whole route in your pocket.
