Casper, WY to Marbleton, WY is 286.2 miles and takes about 5h 44m via West Yellowstone Highway and US 26, with a fuel budget near $45 and enough daylight to finish in a day. This trip stays within Wyoming, connecting two points in the Mountain West region. Expect a mixed drive with a good portion on main highways, making it a straightforward, single-day journey. You'll be covering a significant distance, so plan for a full day of driving to reach your destination comfortably.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
143.1 miles from Casper, WY
A natural place for your longest stop of the day
, about 2h 47m into the drive
.
Main Roads
Road
Distance
Duration
West Yellowstone Highway
94.3 mi
1h 47m
Highway 28
66.5 mi
1h 15m
US 26
36.6 mi
41m
Farson Mercantile
36.4 mi
39m
WY 351
24.2 mi
42m
South Main Street
9.8 mi
11m
East Main Street
8.4 mi
9m
US 20
5.1 mi
6m
Longest stretch:
West Yellowstone Highway
— 94.3 mi, about 1h 47m
Turn-by-Turn Driving Directions
Step-by-step road directions between Casper, WY and Marbleton, WY.
1
Start on North Sunlight Drive
0.3 mi·1 min·North Sunlight Drive
2
Turn right
0.1 mi·33 sec
3
Turn right onto East Sunlight Drive
0.5 mi·1 min·East Sunlight Drive
4
At end of road, turn right onto Bryan Stock Trail
1.1 mi·1 min·Bryan Stock Trail
5
Turn right onto US 20; US 26; US 87
0.2 mi·16 sec·East F Street
6
Take the ramp onto US 20; US 26; US 87
2.1 mi·2 min·US 20; US 26; US 87
7
Take the exit
0.3 mi·45 sec
Toward US 20 West, US 26 West, WY 220 West: Shoshoni, Port of Entry
8
Keep slight left at fork
350 ft·10 sec
9
Turn left onto US 20; US 26
3.0 mi·3 min·US 20; US 26
10
Turn right onto US 20; US 26
94 mi·1 hr 47 min·West Yellowstone Highway
11
Continue on US 26; WY 789
18 mi·20 min·US 26; WY 789
12
Continue on US 26; WY 789
19 mi·21 min·US 26; WY 789
Use the straight lane.
13
Continue on WY 789
9.8 mi·11 min·South Main Street
14
Turn left onto US 287; WY 789
8.4 mi·9 min·East Main Street
15
Continue on WY 28
66 mi·1 hr 15 min·Highway 28
16
Turn right onto US 191
36 mi·39 min·Farson Mercantile
17
Turn left onto WY 351
24 mi·42 min·WY 351
18
At end of road, turn left onto US 189
2.4 mi·3 min·US 189
19
Turn left onto East 1st Street
90 ft·3 sec·East 1st Street
20
Arrive at destination
East 1st Street
Trip Plan
Given the 5-hour 44-minute duration, leaving Casper in the morning is your best bet to maximize daylight. You'll have one recommended stop, but with only one day needed, you have flexibility. Keep an eye on your fuel gauge, especially during the 94.3-mile stretch on West Yellowstone Highway, as services might be spaced out. The total fuel cost is estimated at $45, so budget accordingly before you depart.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 143.1 miles from Casper, WY, or about 2h 47m into the drive.
The longest continuous stretch on this route runs about 94.3 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 63 miles or 1h 16m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 143.1 miles or 2h 47m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 31m
Traffic, exits, and arrival timing usually matter more near Marbleton, WY than in the middle of the route.
Before You Leave
+
Open the route before leaving Casper, WY so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Casper, WY
This is one driving day of about 286.2 miles and 5h 44m.
Your first comfortable stop window is around 63 miles from Casper, WY.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on West Yellowstone Highway for about 94.3 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 11
5 decision points cluster between mile 0.3 and 7.7 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0.3 mi into trip|~1m in
Turn right
Navigation decision point
5
0.9 mi into trip|~3m in|Bryan Stock Trail
At end of road, turn right onto Bryan Stock Trail
Navigation decision point
5
4.3 mi into trip|~8m in
Take the exit toward US 20 West, US 26 West, WY 220 West: Shoshoni, Port of Entry
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward US 20 West, US 26 West, WY 220 West: Sho...
4
4.7 mi into trip|~9m in
Keep slight left at fork
Highway fork - watch signs carefully
4
7.7 mi into trip|~13m in|US 20; US 26 / West Yellowstone Highway
Turn right onto US 20; US 26 / West Yellowstone Highway
Navigation decision point
Fuel & Cost
Regular Gas
$44.61 one way
$89.22 round trip
$3.96/gal25.4 MPG avg100 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$47.02
$94.04
premium
$4.47
$50.41
$100.82
diesel
$4.80
$54.04
$108.08
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$45
Meals
$25–$50
Total
$70–$95
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 100.1 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $30 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
85.9
1
$30.05
$13.74
Efficient EV
71.6
0
$25.04
$11.45
EV Truck/SUV
114.5
1
$40.07
$18.32
Gas CO2
100 kg
EV CO2
33 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Jul 17, 2026
Origin
Casper, WY
Late night
in Casper on Sunday
Local time
3:07 AM
MDT
Current temp
96°F
Sunny
E 3 to 17 mph1% chanceLive forecast
Flood Watch
Flood Watch issued July 17 at 10:33AM MDT until July 17 at 10:00PM MDT by NWS Riverton WY
Flood Watch
Flood Watch issued July 17 at 10:33AM MDT until July 17 at 10:00PM MDT by NWS Riverton WY
Destination
Marbleton, WY
Late night
in Marbleton on Sunday
Local time
3:07 AM
MDT
Current temp
85°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
SSE 2 to 7 mph20% chanceLive forecast
Flood Watch
Flood Watch issued July 17 at 10:33AM MDT until July 17 at 10:00PM MDT by NWS Riverton WY
Flood Watch
Flood Watch issued July 17 at 10:33AM MDT until July 17 at 10:00PM MDT by NWS Riverton WY
93°F
Riverton, WY
143 mi in
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
11 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
5h 44m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
More Details
What kind of drive is this?
This route offers a mixed driving experience, with 47% of the journey on highways. The longest uninterrupted stretch you'll encounter is 94.3 miles on West Yellowstone Highway, so be prepared for a significant period without major towns or services. The roads transition from broader highways to more local routes as you progress, providing varied scenery and driving conditions. It's not a monotonous interstate crawl, but rather a dynamic journey across the Wyoming landscape.
47% highway, the rest on surface roads — varied driving throughout.
20 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 94.3 mi on West Yellowstone Highway.
How Hard Is This Drive?
3/10
This route mixes highway mileage with some local-road sections near the start or finish. There are only a few real navigation decisions along the way. The trickiest moment comes around 0.3 miles in.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 5h 44m drive. You will face about 11 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: at 0.3 miles: Navigation decision point; at 0.9 miles (Bryan Stock Trail): Navigation decision point; at 4.3 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Casper is a city in Central Wyoming with a population of 59,000 people (2020). If you're passing through the state, Casper is a likely choice for an overnight stop or as a place to find food and supplies before heading to the national parks in the state's northwestern corner or to the forests located to the southeast or to the north.
The city has a few attractions to entertain visitors for a day or so, but the real attraction lies in the surrounding areas, which include some of the state's most interesting historical and natural sites. Independence Rock, South Pass City, Ayre's Bridge, Castle Gardens and two national forests are within a 60-mile (100-km) drive of downtown Casper. The Oregon and California trails once passed through the city and visible signs of their presence can be found within a stone's throw of the city's boundaries.
Top landmarks
•North Casper Clubhouse
•Rialto Theatre — movie theater in Casper, Wyoming, United States
•Casper Fire Department Station No. 1 — fire station in Casper, Wyoming
The longest stretch is about 94.3 miles on West Yellowstone Highway. The full list of main roads is in the Roads section above.
Yes — we found about 3 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 3 rest areas along the route for bathroom stops.
Mostly yes along the main roads, but rural stretches through WY can have sparse or no coverage. Before you leave, download offline Google Maps or Apple Maps for the route, and consider downloading music or podcasts instead of streaming. If you depend on data for navigation, keep a paper backup of the turn-by-turn directions.
The main spots that need attention: at 0.3 miles: Navigation decision point; at 0.9 miles (Bryan Stock Trail): Navigation decision point; at 4.3 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Not recommended in a single day. At 5.7 hours each way, a round trip means 11.5 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Marbleton, WY before the return drive.
