The drive from Casper, WY to Greybull, WY covers 204.7 miles and takes about 4h 3m behind the wheel.
This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on West Yellowstone Highway, North 10th Street, Park Street for much of the mileage,
and the overall profile is turn-heavy local drive.
The longest uninterrupted segment is about 93.8 miles on West Yellowstone Highway.
At current regular gas prices, budget about $32.44 one way before food or hotel costs.
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
102.3 miles from Casper, WY
A natural place for your longest stop of the day
, about 2h into the drive
.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 4h 3m. Total distance: 204.7 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Turn-heavy local drive route profile with national parks nearby.
Drive Character
Expect a 4h 3m drive with frequent turns across 204.7 miles of local and secondary roads.
This route has more turning and local-road decision points than a simple highway run.
There are about 19 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
West Yellowstone Highway is the longest continuous segment at about 93.8 miles.
How Hard Is This Drive?
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. There are only a few real navigation decisions along the way. The trickiest moment comes around 0.3 miles in.
Driving Effort4/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 4h 3m drive. You will face about 12 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.
Critical Maneuvers
5 of 12 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
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
5
101.5 mi into trip|~1h 59m in|US 20; WY 789 / Idaho Street
Turn right onto US 20; WY 789 / Idaho Street
Lane positioning matters here
Use the straight / left / right lanes.
Main Roads
Road
Distance
Duration
West Yellowstone Highway
93.8 mi
1h 46m
North 10th Street
37.5 mi
42m
Park Street
32.4 mi
39m
Idaho Street
31.9 mi
38m
US 20
5.1 mi
6m
Bryan Stock Trail
1.1 mi
1m
South 6th Street
0.8 mi
2m
East Sunlight Drive
0.5 mi
1m
Longest stretch:
West Yellowstone Highway
— 93.8 mi, about 1h 46m
Turn-by-Turn Driving Directions
Step-by-step road directions between Casper, WY and Greybull, 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 46 min·West Yellowstone Highway
11
Turn right onto US 20; WY 789
32 mi·38 min·Idaho Street
Use the straight / left / right lanes.
12
Turn left onto US 20; WY 789
0.8 mi·2 min·South 6th Street
Use the slight left / right lanes.
13
Continue on US 20; WY 789
32 mi·39 min·Park Street
Use the left / slight right lanes.
14
Turn left onto North Railway Avenue
0.4 mi·1 min·North Railway Avenue
15
Continue on Russell Avenue
0.1 mi·21 sec·Russell Avenue
16
Turn left onto US 16; US 20; WY 789
37 mi·42 min·North 10th Street
17
Turn left onto Greybull Avenue
268 ft·13 sec·Greybull Avenue
18
Turn right onto North 7th Street
82 ft·3 sec·North 7th Street
19
Arrive at destination
North 7th Street
Trip Plan
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 102.3 miles from Casper, WY, or about 2h into the drive.
The longest continuous stretch on this route runs about 93.8 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 45 miles or 55m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 102.3 miles or 2h in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 22m
Traffic, exits, and arrival timing usually matter more near Greybull, 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 204.7 miles and 4h 3m.
Your first comfortable stop window is around 45 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 93.8 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 102.3 mi from Casper, WY
· 2h into the drive
Place data sourced from public business listings. Hours and availability may vary.
Fuel & Cost
Regular Gas
$32.44 one way
$64.88 round trip
$4.03/gal25.4 MPG avg72 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.22
$34.00
$68.00
premium
$4.53
$36.52
$73.03
diesel
$5.61
$45.20
$90.39
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$32
Meals
$25–$50
Total
$57–$82
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 71.6 kg one way.
Prices: EIA weekly data, 2026-04-13.
EV Charging Along Route
3 DC fast chargers
· Coverage: fair
Hat Six Travel Center - Tesla Supercharger
Evansville, WY
Tesla
8 DCFC
Flying J 758
Casper, WY
eVgo Network
4 DCFC
Target T0164 (Casper, WY)
Casper, WY
Electrify America
4 DCFC
Tesla: 1
eVgo Network: 1
Electrify America: 1
Station data from NREL Alternative Fuel Stations database.
Driving Electric?
About $21 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
61.4
0
$21.49
$9.83
Efficient EV
51.2
0
$17.91
$8.19
EV Truck/SUV
81.9
1
$28.66
$13.10
Gas CO2
72 kg
EV CO2
24 kg (67% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
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 Apr 15, 2026
Origin
Casper, WY
Late night
in Casper on Saturday
Local time
3:39 AM
MDT
Current temp
44°F
Unavailable
Live forecast
Destination
Greybull, WY
Late night
in Greybull on Saturday
Local time
3:39 AM
MDT
Current temp
76°F
Unavailable
Live forecast
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
32 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
4h 3m 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.
Frequently Asked Questions
The drive from Casper, WY to Greybull, WY covers 204.7 miles and takes about 4h 3m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are West Yellowstone Highway, North 10th Street, Park Street. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 102.3 miles from Casper, WY. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $32.44 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
An early start around 7-8 AM gets you there with plenty of daylight left. A late afternoon start means arriving after dark. Morning is better.
Plan about 1 meaningful break for fuel, food, or rest. Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
This is a straightforward 4h 3m drive. You will face about 12 decision points, but nothing that requires special attention if you follow navigation.
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.
The route from Casper, WY to Greybull, WY does not surface many named destination signs beyond the main corridor.
How this page is built
Compiled by the Trip.ovh planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, NREL for EV charging, and NPS for national parks. See our methodology for refresh cadence and limitations.
