Casper to South Park is 294.1 miles and takes about 5h 53m via West Yellowstone Highway and US 26 / US 287, with a fuel budget near $52 and enough daylight to finish in a day. This trip stays within Wyoming, connecting two points in the Mountain West region. Expect a mixed driving experience with both highway stretches and surface roads. With a single recommended day, this route is well-suited for a straightforward day trip, allowing you to reach your destination without needing an overnight stop.
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
147.1 miles from Casper, WY
A natural place for your longest stop of the day
, about 2h 51m into the drive
.
Main Roads
Road
Distance
Duration
West Yellowstone Highway
94.3 mi
1h 47m
East Main Street
77.9 mi
1h 27m
US 26 / US 287
53.2 mi
1h
North Highway 89
29.3 mi
40m
US 26
21.6 mi
24m
US 20
5.1 mi
6m
South Highway 89
4.3 mi
6m
East Ramshorn Street
2.2 mi
2m
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 South Park, 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
4.0 mi·4 min·US 26; WY 789
Use the straight lane.
13
Turn right onto US 26
78 mi·1 hr 27 min·East Main Street
14
Turn left onto US 26; US 287
2.2 mi·2 min·East Ramshorn Street
15
Continue on US 26; US 287
53 mi·1 hr·US 26 / US 287
16
Continue on US 26; US 89; US 191
23 mi·32 min·North Highway 89
17
Enter roundabout onto US 26; US 89; US 191
97 ft·5 sec·North Highway 89
18
Continue on US 26; US 89; US 191
6.0 mi·8 min·North Highway 89
19
Continue on US 26; US 89; US 191
0.9 mi·2 min·North Cache Street
20
Continue on South Cache Drive
392 ft·12 sec·South Cache Drive
21
Turn right onto West Pearl Avenue
0.4 mi·45 sec·West Pearl Avenue
22
At end of road, turn left onto US 26; US 89; US 189; US 191
1.0 mi·2 min·West Broadway Avenue
23
Continue on US 26; US 89; US 189; US 191
4.3 mi·6 min·South Highway 89
24
Turn right onto South Park Loop Road
0.6 mi·1 min·South Park Loop Road
25
Turn right onto Melody Creek Lane
0.7 mi·2 min·Melody Creek Lane
26
Arrive at destination
Melody Creek Lane
Trip Plan
To make the most of this 5h 53m drive, consider an early morning departure from Casper to maximize daylight. With only one recommended stop, plan your break strategically to avoid long stretches without services. The route covers 294.1 miles and is estimated to cost around $52 for fuel. Keep an eye on your fuel gauge, especially during the 94.3-mile segment on West Yellowstone Highway, as services might be less frequent in that area.
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 147.1 miles from Casper, WY, or about 2h 51m 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 65 miles or 1h 18m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 147.1 miles or 2h 51m 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 37m
Traffic, exits, and arrival timing usually matter more near South Park, 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 294.1 miles and 5h 53m.
Your first comfortable stop window is around 65 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 13
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
$45.84 one way
$91.68 round trip
$3.96/gal25.4 MPG avg103 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$48.32
$96.64
premium
$4.47
$51.80
$103.61
diesel
$4.80
$55.53
$111.06
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$46
Meals
$25–$50
Total
$71–$96
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 102.9 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $31 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
88.2
1
$30.88
$14.12
Efficient EV
73.5
0
$25.73
$11.76
EV Truck/SUV
117.6
1
$41.17
$18.82
Gas CO2
103 kg
EV CO2
34 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
2:16 AM
MDT
Current temp
59°F
Partly Cloudy
NNE 2 to 15 mph6% chanceLive forecast
Flash Flood Warning
Flash Flood Warning issued July 16 at 4:28PM MDT until July 16 at 7:30PM MDT by NWS Riverton WY
Flood Watch
Flood Watch issued July 16 at 2:56PM MDT until July 16 at 11:00PM MDT by NWS Riverton WY
Destination
South Park, WY
Late night
in South Park on Sunday
Local time
2:16 AM
MDT
Current temp
50°F
Slight Chance Showers And Thunderstorms
ENE 2 mph31% chanceLive forecast
Flash Flood Warning
Flash Flood Warning issued July 16 at 4:28PM MDT until July 16 at 7:30PM MDT by NWS Riverton WY
Flood Watch
Flood Watch issued July 16 at 2:56PM MDT until July 16 at 11:00PM MDT by NWS Riverton WY
53°F
Dubois, WY
147 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
9 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 53m 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.
National Parks Near This Route
Worth a detour if your schedule allows.
Grand Teton National Park
National Park
Soaring over a landscape rich with wildlife, pristine lakes, and majestic alpine vistas, the Teton Range stands as a testament to generations of stewards. For over 11,000 years, communities have thriv...
7 mi from route
~19 min detour
$35
near mile 263.7
Danger: Third measles case in Teton Co. confirmed by Wyoming Department of Health
Caution: Construction in the South End of the Park
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route is about 39% highway, meaning you'll spend a good portion of the drive cruising at higher speeds. The longest continuous stretch on highway is 94.3 miles on West Yellowstone Highway. You'll transition from faster highway driving to more varied surface roads as you progress. Expect to notice the shift from more developed areas to more rural cruising.
39% highway, the rest on surface roads — varied driving throughout.
26 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 53m drive. You will face about 13 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.
Elevation Profile
Mountain driving with significant elevation changes
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
Mixed highway & surface route profile with national parks nearby.
Frequently Asked Questions
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 4 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 4 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.
Yes — Grand Teton National Park. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 5.9 hours each way, a round trip means 11.8 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at South Park, WY before the return drive.
