How far is Greybull, WY from Casper, WY?
The driving distance from Greybull, WY to Casper, WY is about 202.1 miles (325.2 km), with a travel time of about 03h 38m by car.
- The straight-line flight distance is about 142 miles (228.5 km).
- For a round trip, plan for roughly 07h 17m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM MDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 03h 38m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Town of the United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Greybull and Casper.
Turn-by-Turn Driving Directions
Step-by-step road directions between Greybull and Casper.
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1
Start on North 7th Street
25 m · 8 sec · North 7th Street
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2
Turn left onto Greybull Avenue
82 m · 16 sec · Greybull Avenue
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3
Turn right onto South 6th Street
37.5 mi · 42 min · South 6th Street
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4
Turn right onto Russell Avenue
606 ft · 17 sec · Russell Avenue
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5
Continue on North Railway Avenue
2336 ft · 1 min · North Railway Avenue
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6
Turn right onto West Big Horn Avenue
32.4 mi · 39 min · West Big Horn Avenue
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7
Continue on North 6th Street
1.3 km · 2 min · North 6th Street
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8
Turn right onto Shoshoni Street
1.4 km · 2 min · Shoshoni Street
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9
Continue straight
31 mi · 36 min
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10
Turn left onto East 2nd Street
33.1 mi · 38 min · East 2nd Street
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11
Continue on West US Highway 20-26
60.7 mi · 1 hr 9 min · West US Highway 20-26
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12
Turn left
2.7 mi · 3 min
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13
Take the exit right
2.5 mi · 4 min
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14
Take the exit slight right toward US 20 East, US 26 East, US 87 South: North Beverly Street, Bryan Stock Trail
1755 ft · 41 sec
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15
At the end of the road, turn left onto Bryan Stock Trail
1.1 mi · 2 min · Bryan Stock Trail
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16
Turn left onto East Sunlight Drive
1.5 km · 4 min · East Sunlight Drive
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17
Arrive at your destination
0 m · 1 sec · North Sunlight Drive
Car Route Details
A richer read on the saved driving route between Greybull and Casper.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
West US Highway 20-26
Continue on West US Highway 20-26
60.7 mi · 01h 09m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Mostly Sunny then Slight Chance Showers And Thunderstorms leaving Greybull and Mostly Sunny near Casper.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Greybull to Casper?
The road trip is about 202.1 miles (325.2 km) and usually takes 03h 38m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Shoshoni is a useful midpoint, sitting about 102.2 miles from Greybull and 99.9 miles from Casper.
How much longer is the road route than the straight-line distance?
The direct path is about 142 miles (228.5 km), while the road route adds roughly 60.1 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 9:42 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $27.76 one way or $55.51 round trip. Estimated CO2 is about 63.4 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny then Slight Chance Showers And Thunderstorms around Greybull and Mostly Sunny near Casper.
Flight Path Map
This map shows the direct air route between Greybull and Casper. Straight-line distance: 141.96 mi (228.46 km).
#1 Greybull
Town in Big Horn County, Wyoming
| Population | 1,797 |
| Coordinates | 44.4891200, -108.0562100 |
| Altitude | 1156 |
| Country | United States |
#2 Casper
The most populous city in Natrona County, Wyoming.
| Population | 58,498 |
| Coordinates | 42.8666300, -106.3130800 |
| Altitude | 1560 |
| Country | United States |
End: North Sunlight Drive (-106.309604, 42.868632)
Estimated Travel Time
Distance: 325 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 44m |
| 40 mph (64.37 km/h) | 05h 03m |
| 50 mph (80.47 km/h) | 04h 02m |
| 60 mph (96.56 km/h) | 03h 22m |
| 70 mph (112.65 km/h) | 02h 53m |
| 80 mph (129 km/h) | 02h 31m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $27.76 | $55.51 |
| Mid-grade | $4.23 | $30.17 | $60.33 |
| Premium | $4.55 | $32.43 | $64.87 |
| Diesel | $5.41 | $38.59 | $77.18 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Wyoming · Apr 22, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.