The drive from Denver to Yellowstone covers roughly 1,100–1,300 miles (1,770–2,090 km) depending on the route you choose — and every mile of it earns its place. You’ll climb from Colorado’s Front Range through Wyoming’s empty high plains, squeeze through one of America’s greatest canyon drives, soak in the world’s largest hot springs, ride one of the most celebrated scenic highways on the continent, and arrive at a park that still erupts, rumbles, and roams with bison as though civilisation never happened.
This guide is built around a 9-day loop that returns you to Denver without retracing a single road. It includes every booking deadline, entry fee, and permit requirement — the details that most travel articles leave out until after you’ve already set your dates.
Total distance (full loop): approx. 1,250 miles (2,010 km)
Recommended trip length: 8–10 days
Best months: late June to mid-September (see timing note below)
Book These Before You Leave
- America the Beautiful Annual Pass ($80) — covers entry to every national park on this loop. Buy at store.usgs.gov or any park entrance; order online at least 3 weeks before departure or pick up at a park gate.
- Rocky Mountain NP timed-entry permit — required late May through mid-October; book via Recreation.gov. Permits are released one month at a time on the 1st of each month at 8 a.m. MT.
- Yellowstone campgrounds — NPS-managed sites open on Recreation.gov on a 6-month rolling window; Xanterra-managed sites (Bridge Bay, Canyon, Madison, Grant Village) open through yellowstonenationalparklodges.com up to 13 months ahead. Popular sites can sell out within hours of opening.
- Grand Teton campgrounds — all sites bookable 6 months in advance on Recreation.gov on a rolling daily basis.
Entry Fees and the America the Beautiful Pass
Before you hit the road, do this one calculation: entry to Rocky Mountain National Park costs $35 per vehicle (7-day pass), Yellowstone costs $35, and Grand Teton costs $35. That’s $105 in entry fees alone — against an America the Beautiful Annual Pass priced at $80 (US residents). One pass, one vehicle, all three parks — plus hundreds of other federal sites. For any family doing this loop, the pass pays for itself immediately.
Note for international visitors (from January 2026): A $100-per-person surcharge now applies to non-US residents at Yellowstone, Grand Teton, Rocky Mountain, and eight other high-visitation parks. The Non-Resident Annual Pass is priced at $250 and covers all entries for 12 months. Confirm current policy at nps.gov before travelling.
Children aged 15 and under are always admitted free.
When to Go
Late June to early September is peak season: all park roads open, the Beartooth Highway is fully accessible, and wildlife is active. Crowds are real — Yellowstone received over 4 million visitors in recent years — but the trade-off is full access to everything. Plan to be at the most popular spots (Old Faithful, Hayden Valley) before 9 a.m. or after 5 p.m.
Late May offers thinner crowds and the chance to see snow still dusting the Beartooth Plateau, but check road-opening dates carefully — the Beartooth Highway typically opens on the Friday of Memorial Day weekend and some Yellowstone roads remain closed into late May.
September is arguably the best month: elk rut begins, aspen turn gold, crowds thin significantly, and temperatures are comfortable. The Beartooth closes around mid-October, so give yourself a buffer.
Winter and early spring: Yellowstone’s north entrance (Gardiner to Mammoth) is the only road open to regular vehicles year-round. All other entrances close from November to late April. Snow-coach tours and cross-country skiing are winter alternatives, but this guide is built for a summer family road trip.
The Route at a Glance
This itinerary runs as a clockwise loop from Denver: north along I-25 to Rocky Mountain National Park, then northeast up to Casper, west through Wind River Canyon to Thermopolis, northwest to Cody, into Yellowstone via the Chief Joseph Scenic Byway, through the park to Grand Teton and Jackson Hole, and back to Denver via Laramie on I-80.
| Leg | Distance | Drive time (no stops) |
|---|---|---|
| Denver → Estes Park (RMNP gateway) | 70 miles (113 km) | ~1 hr 30 min |
| Estes Park → Casper, WY | 255 miles (410 km) | ~4 hrs |
| Casper → Thermopolis | 130 miles (209 km) | ~2 hrs |
| Thermopolis → Cody | 84 miles (135 km) | ~1 hr 30 min |
| Cody → Yellowstone (East Entrance via Chief Joseph) | 75 miles (121 km) | ~2 hrs |
| Yellowstone (internal circuit: Lamar → Canyon → Geysers → Lake) | ~140 miles (225 km) | ~4 hrs (allow 2+ days) |
| Yellowstone South → Grand Teton / Jackson | 60 miles (97 km) | ~1 hr 15 min |
| Jackson → Denver (via Laramie, I-80/I-25) | 460 miles (740 km) | ~6 hrs 30 min |
Day-by-Day Itinerary
Day 1: Denver to Rocky Mountain National Park — 70 miles (113 km)
Head north on US-36 to Estes Park, the gateway town sitting just outside Rocky Mountain National Park. The drive from Denver takes about 90 minutes without stops, so an early departure gives you a full day in the park.
Permit critical: From late May through mid-October, a timed-entry reservation is required to enter RMNP between 9 a.m. and 2 p.m. There are two types: standard Timed Entry (all areas except Bear Lake Road) and Timed Entry + Bear Lake Road. If your family wants the Emerald Lake and Dream Lake hikes — the park’s most photographed trails — you need the Bear Lake Road permit, which sells out fastest. Book both types on Recreation.gov. Permits cannot be purchased at the entrance stations.
What to do: The Nymph–Dream–Emerald Lakes trail is 3.6 miles (5.8 km) round trip with minimal elevation gain — one of the best family hikes in Colorado. Trail Ridge Road (closed in winter) crosses the continental divide at 12,183 feet (3,713 m) — an easy scenic drive with the Alpine Visitor Center at the top. Elk and mule deer are frequently seen in Moraine Park just before dusk.
Stay: Estes Park has a good range of motels and vacation rentals; camping inside the park at Aspenglen or Glacier Basin requires advance booking on Recreation.gov. In-park campers do not need a separate timed-entry permit.
Day 2: Rocky Mountain NP to Casper — 255 miles (410 km)
Exit RMNP via the Fall River or Beaver Meadows entrances, pick up US-34 east, then I-25 north toward Casper. This is the longest single driving day on the loop, but the I-25 corridor through Wyoming is genuinely scenic — the North Platte River cuts through Casper’s southern edge, and the Laramie Mountains frame the horizon.
Stop en route: Fort Collins — 40 miles (64 km) from Estes Park — is worth 90 minutes for lunch on Old Town Square, which sits at the western terminus of the original Overland Trail route. Colorado’s oldest brewery, New Belgium, and a string of independent coffee shops cluster in a walkable few blocks.
Casper sits at the intersection of five historic westward trails — the Oregon, California, Mormon, Pony Express, and Bozeman — and the National Historic Trails Interpretive Center does a genuinely good job of making trail history accessible to children. The exhibits include a simulated river crossing and covered wagon. Casper Mountain rises immediately south of town and has short trails suitable for families with young children.
Day 3: Casper to Thermopolis to Cody — 214 miles (344 km)
This is the hidden gem day of the loop — two stops that appear on very few itineraries but consistently impress families who make them.
Head west out of Casper on US-20/26 to Thermopolis — 130 miles (209 km) from Casper. The town’s name is Greek for “Hot City,” and it earns it: Hot Springs State Park contains what is claimed to be the world’s largest mineral hot springs, flowing at 3,000 gallons (11,356 litres) per minute at 130°F (54°C). The State Bathhouse — a direct result of the 1896 land treaty between the Eastern Shoshone and Northern Arapaho tribes and the federal government, which stipulated that soaking access must always be free — is genuinely free to use.
For families with children who prefer water slides to history lessons, the Star Plunge and Hellie’s Tepee Pools are commercial operations inside the state park with slides and outdoor pools. The Wyoming Dinosaur Center, also in Thermopolis, was named one of the World’s Coolest Places for Kids by TIME Magazine in 2019; it runs hands-on fossil dig programmes for children.
Wind River Canyon: Four miles (6 km) south of Thermopolis on US-20, the Wind River Canyon Scenic Byway drops you into a 12-mile (19 km) gorge where canyon walls rise 2,500 feet (762 m) and expose rock formations spanning from the Precambrian — 2.9 billion years old — to the Triassic. Drive south through the canyon first, then return north through Thermopolis and continue to Cody. The canyon road is smooth and accessible for all vehicles; the drive takes about 40 minutes without stops but rewards slow travel.
Cody — 84 miles (135 km) north of Thermopolis — sits at the eastern gateway to Yellowstone. The Buffalo Bill Center of the West is five world-class museums under one roof (Buffalo Bill, Plains Indians, Whitney Western Art, Draper Natural History, and Cody Firearms). Plan a minimum of three hours. The nightly Cody Stampede Rodeo (June through August) is one of the most family-friendly rodeos in Wyoming.
Day 4: Cody to Yellowstone — 75 miles (121 km) via Chief Joseph Scenic Byway
The direct route from Cody into Yellowstone follows US-14/16/20 west through the Wapiti Valley and Buffalo Bill Reservoir — 52 miles (84 km) to the East Entrance. It’s a good drive. But the alternative — the Chief Joseph Scenic Byway — is spectacular.
Head north from Cody on WY-120, then turn west onto WY-296. The byway climbs through high volcanic terrain with sweeping views of the Absaroka Range before dropping into the Clark’s Fork Valley. Where the byway meets US-212 at the top, you face a choice: turn right and drive a further 68 miles (109 km) on the Beartooth Highway to Red Lodge, Montana (and re-enter Yellowstone via the northeast entrance), or turn left and enter Yellowstone directly. Both are worth doing on separate days if your schedule allows.
The Beartooth Highway option (add-on day): US-212 between Cooke City and Red Lodge, Montana is designated an All-American Road by the National Scenic Byways program. The 68-mile (109 km) route climbs 5,000 feet (1,524 m) through lodgepole pine forests to an alpine plateau hosting over 1,000 small lakes, 20 peaks above 12,000 feet (3,658 m), and a summit — Beartooth Pass — at 10,947 feet (3,336 m). Carry layers regardless of the weather in Cody; temperature drops sharply as elevation increases and snow can remain at the top through early July. The highway is generally open from Memorial Day weekend through mid-October — check current conditions on the Montana Department of Transportation site before driving.
Enter Yellowstone via the Northeast Entrance at Cooke City. This is the only park entrance open year-round to regular vehicles alongside the North Entrance at Gardiner, and the northeast corridor — particularly the Lamar Valley — delivers some of the best wildlife viewing in the park.
Days 5–6: Inside Yellowstone National Park
Yellowstone National Park covers 2.2 million acres (890,000 hectares) — larger than Rhode Island and Delaware combined. Two days gives you time to cover the major areas if you’re strategic with early starts.
Lamar Valley — Day 5 morning
Pull out binoculars before breakfast. The Lamar Valley in the park’s northeast corner is nicknamed “America’s Serengeti” and for good reason: bison herds of hundreds move through the wide river corridor, wolf packs are tracked year-round (the valley was the first reintroduction site in 1995), and grizzly bears are regularly spotted in the valley fringe. The key to wildlife watching is timing — arrive at 6–8 a.m. or again from 5–7 p.m. Midday, the wildlife retreats into shade and the valley goes quiet. Bring a spotting scope or at least 8×42 binoculars; anything further than 100 yards needs magnification.
Grand Canyon of the Yellowstone — Day 5 afternoon
The 1,000-foot (305 m) deep canyon and the 308-foot (94 m) Lower Falls are among the park’s most dramatic sights. The South Rim Trail to Artist Point is a flat 0.5-mile (0.8 km) walk — fully accessible and suitable for pushchairs. The North Rim trail to Brink of the Lower Falls involves 328 steps down and back up — manageable for most children over 6 and the view straight down at the falls is extraordinary.
Geyser Basins — Day 6
Old Faithful erupts roughly 17 times per day. Predictions are posted on the NPS website and on boards at the Visitor Education Center — typically accurate to within 10 minutes. Eruptions last 1.5 to 5 minutes and peak at 100–185 feet (30–56 m). The Old Faithful area also contains the Upper Geyser Basin, the largest concentration of geysers on earth; the 1.3-mile (2.1 km) paved boardwalk loop is ideal for young families. Daisy Geyser, 0.6 miles (1 km) up the basin, erupts every 110–240 minutes for 3–5 minutes and is one of the most predictable geysers in the park — useful if you want a guaranteed eruption on your schedule.
For something less crowded with equally striking geology, drive north to Norris Geyser Basin — the hottest, most volatile thermal area in Yellowstone. Steamboat Geyser here is the tallest active geyser in the world (eruptions can reach 300 feet / 91 m), though eruptions are irregular.
Hayden Valley — wildlife, Day 6 dusk
Located between Canyon Village and Fishing Bridge on the east side of the park, Hayden Valley is your best chance of seeing bison at close range from a vehicle pull-out. Grizzly bears, coyotes, and sandhill cranes are also regularly seen here. The valley is closed to off-trail hiking — stay on the road shoulders and use binoculars from your vehicle.
Campsite strategy
Yellowstone has 12 campgrounds with over 2,150 sites. The five Xanterra-operated sites (Madison, Canyon, Bridge Bay, Grant Village, Fishing Bridge RV Park) are bookable through yellowstonenationalparklodges.com up to 13 months in advance — and sell out within hours of opening, particularly for July and August dates. The six NPS-managed sites open on Recreation.gov on a 6-month rolling window. Mammoth Hot Springs campground (at the north entrance) is the only one operated first-come, first-served year-round. If you miss the reservation windows, use the Recreation.gov Availability Alerts feature — cancellations happen and the alerts deliver fast. Sites cost $20–$45 per night depending on amenities.
For families wanting lodge accommodation inside the park, the Old Faithful Inn is the most iconic option — a 1904 log structure with rooms ranging from basic to comfortable. It books out as fast as the campgrounds; check yellowstonenationalparklodges.com early.
Junior Ranger Program
Pick up a Junior Ranger activity booklet at any Yellowstone visitor centre. Children complete age-appropriate activities about the park’s geology, wildlife, and history, then receive a badge at any ranger station. It’s free, keeps children engaged between stops, and the badge ceremony is a genuine highlight for younger children. Yellowstone rangers run the programme at Canyon, Old Faithful, Mammoth, and Fishing Bridge visitor centres.
Day 7: Yellowstone to Grand Teton and Jackson — 60 miles (97 km)
Exit Yellowstone via the South Entrance and drop into Grand Teton National Park — the transition is seamless, the parks share a boundary, and your America the Beautiful Pass covers both.
The 42-mile (68 km) Teton Park Road runs between Moran Junction and Jenny Lake, offering uninterrupted views of the Teton Range. Pull-outs are frequent; the Cathedral Group Turnout is the classic viewpoint for the three central peaks (Grand Teton, Mount Owen, Teewinot). Signal Mountain Summit Road is a 5-mile (8 km) paved spur with panoramic views from above the valley — a 20-minute drive from the road to an outlook most visitors miss.
For families with young children, the String Lake Trail (3.8 miles / 6.1 km loop) is flat, scenic, and ends at a lake where swimming is allowed in summer. The Colter Bay Lakeshore Trail (2 miles / 3.2 km) traces Jackson Lake’s edge — look for osprey nesting platforms and moose in the willows at each end of the loop.
Ranger-led programmes at Colter Bay and Jenny Lake visitor centres run daily in summer and are among the best free activities in the national park system — geared for all ages.
Jackson, Wyoming — 12 miles (19 km) south of the park — is a polished mountain town. Town Square is ringed with arches made from naturally shed elk antlers and has a lively evening atmosphere. The National Elk Refuge borders the town’s eastern edge; in summer the elk have moved to higher ground but bison, pronghorn, and waterfowl remain.
Day 8: Jackson to Laramie — 280 miles (451 km)
The return south via US-189/191 through the Star Valley and into the high desert of southwestern Wyoming is one of the least-travelled but most atmospheric drives on the loop. Rejoin I-80 at Evanston, then east toward Laramie through the high plains at 7,000–8,000 feet (2,130–2,440 m). Laramie has a small but excellent historic district and the University of Wyoming Art Museum is free — a solid mid-afternoon stop.
Day 9: Laramie to Denver — 130 miles (209 km)
I-25 south from Cheyenne to Denver takes about 90 minutes. If the family has energy for one final stop, the Colorado State Capitol in downtown Denver offers free tours and sits exactly one mile above sea level — a number precisely marked on the west steps.
Family Packing List — What This Route Specifically Needs
Standard packing lists tell you to bring sunscreen and water. This route has specific requirements worth calling out:
- Bear spray — mandatory for any off-boardwalk walking in Yellowstone or Grand Teton. Carry it accessible, not buried in a bag. UDAP and Counter Assault are the two most commonly recommended brands.
- Layered clothing for the Beartooth — temperatures at the 10,947-foot (3,336 m) summit can be 30–40°F (17–22°C) cooler than Cody. Snow in June is not unusual. Fleece and a windproof shell are non-negotiable.
- Swimwear — for Thermopolis hot springs and, in Grand Teton, for String Lake.
- Binoculars — essential for Lamar Valley and Hayden Valley. 8×42 is the ideal specification for wildlife watching from a vehicle.
- Printed permits and reservations — cell service inside Yellowstone and RMNP is patchy. Screenshot or print every timed-entry permit, campsite confirmation, and pass receipt before you leave the city.
- Cash — some park entrance stations are card-only but smaller concessions, roadside stalls, and some campground hosts prefer or require cash.
- Park-specific apps — the NPS App works offline for trail maps once downloaded; download Yellowstone and Grand Teton data before leaving cell coverage.
- Snacks that survive heat — the Wyoming high desert can hit 90°F (32°C). Chocolate-based snacks and anything with a low melting point are a mess by mid-morning. Trail mix, crackers, dried fruit, and jerky hold up.
Keeping Children Engaged on the Road
The longest consecutive drive on this loop — Jackson to Laramie — is about 4.5 hours. A few things that work specifically on this route:
- Wildlife log: Give each child a small notebook to record every species they see and where. Yellowstone alone can produce 10–15 species in a day (bison, elk, pronghorn, osprey, bald eagle, coyote, ground squirrel, and if lucky, wolf or grizzly). The competitive element of who spots something first is reliably effective.
- Road Trip Bingo: Build a custom card before you leave. Include specifics: a bison jam, a geyser eruption, a ranger in a flat-brimmed hat, a teepee fountain (at Thermopolis), a Continental Divide sign.
- Junior Ranger booklets: Available at every major park; children can work through them between stops and in the car on quiet stretches.
- Audiobooks: My Side of the Mountain by Jean Craighead George, Island of the Blue Dolphins, or any of Ranger Rick’s field guides as audio work well for this landscape.
- Wyoming Sticker Passport: Wyoming’s Chambers of Commerce run a sticker passport programme — children collect stickers at visitor centres across the state. Pick up a passport at the Casper or Cody visitor centre.
Final Notes Before You Go
This loop does not have a weak leg. Every day earns its place — from the geological theatre of Wind River Canyon to the alpine engineering of the Beartooth, to the thermal chaos of Yellowstone’s geyser basins. The planning is front-loaded: get the America the Beautiful Pass, book your Yellowstone campsites or lodge the moment the window opens, and secure your Rocky Mountain National Park timed-entry permit. Once those three things are confirmed, the trip builds itself.
For current road conditions in Wyoming, check the Wyoming DOT’s WyoRoad site. For Yellowstone road and facility updates, the NPS roads page is updated daily in season.
Pack the boots, download the maps, and drive carefully through the bison jams — they won’t move for anyone.