Afton, WY to Casper, WY is 356.3 miles and takes about 7h 15m via US 20, with a fuel budget near $56 and enough daylight to finish in a day. This drive traverses the Mountain West region within Wyoming, offering a mixed driving experience that's manageable for a single day. You'll encounter a blend of road types, making it a practical choice for getting between these two points without needing an overnight stop. Plan for a straightforward journey across the state's diverse landscapes.
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
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
178.1 miles from Afton, WY
A natural place for your longest stop of the day
, about 3h 48m into the drive
.
Main Roads
Road
Distance
Duration
US 20
80 mi
1h 31m
South 1st Street
77.9 mi
1h 27m
East Highway 287
53.2 mi
1h
North Federal Boulevard
39 mi
44m
North Highway 89
29.3 mi
40m
US 26
22.8 mi
31m
US Highway 89
17.5 mi
22m
Washington Street
15.6 mi
21m
Longest stretch:
US 20
— 80 mi, about 1h 31m
Turn-by-Turn Driving Directions
Step-by-step road directions between Afton, WY and Casper, WY.
1
Start on this road
108 ft·13 sec·this road
2
Turn left onto East 4th Avenue
442 ft·21 sec·East 4th Avenue
3
Turn right onto US 89
16 mi·21 min·Washington Street
4
Continue on US 89
17 mi·22 min·US Highway 89
5
Turn right onto US 26; US 89
23 mi·31 min·US 26; US 89
Use the right lane.
6
Enter roundabout onto US 26; US 89; US 189; US 191
122 ft·3 sec·South Highway 89
7
Continue on US 26; US 89; US 189; US 191
12 mi·17 min·South Highway 89
8
Continue on US 26; US 89; US 189; US 191
1.0 mi·2 min·West Broadway Avenue
9
Turn right onto West Pearl Avenue
0.4 mi·49 sec·West Pearl Avenue
10
Turn left onto South Cache Drive
392 ft·9 sec·South Cache Drive
11
Continue on US 26; US 89; US 191
0.9 mi·2 min·North Cache Street
12
Continue on US 26; US 89; US 191
6.0 mi·8 min·North Highway 89
13
Enter roundabout onto US 26; US 89; US 191
110 ft·6 sec·North Highway 89
14
Continue on US 26; US 89; US 191
23 mi·32 min·North Highway 89
15
Continue on US 26; US 287
53 mi·1 hr·East Highway 287
16
Continue on US 26; US 287
2.2 mi·2 min·West Ramshorn Street
17
Turn right onto US 26; US 287
78 mi·1 hr 27 min·South 1st Street
Use the straight lane.
18
At end of road, turn left onto US 26; WY 789
39 mi·44 min·North Federal Boulevard
19
Continue on US 20; US 26
77 mi·1 hr 27 min·US 20; US 26
20
Turn left onto US 20; US 26
2.7 mi·3 min·US 20; US 26
21
Take the exit
2.5 mi·3 min
22
Take the exit onto US 20; US 26; US 87
0.3 mi·41 sec·US 20; US 26; US 87
Toward US 20 East, US 26 East, US 87 South: North Beverly Street, Bryan Stock Trail
23
At end of road, turn left onto I 25 Business
1.1 mi·2 min·Bryan Stock Trail
24
Turn left onto East Sunlight Drive
0.9 mi·3 min·East Sunlight Drive
25
Arrive at destination
North Sunlight Drive
Trip Plan
Given the 7-hour duration, starting your drive from Afton early in the morning is advisable to maximize daylight. With two recommended stops, you can comfortably break up the 356.3 miles, ensuring you stay refreshed. Keep an eye on your fuel levels, especially during the longer 80-mile stretches on US 20, as services might be spaced out. The $56 fuel estimate is a helpful guideline for budgeting this single-day adventure across Wyoming.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 178.1 miles from Afton, WY, or about 3h 48m into the drive.
The longest continuous stretch on this route runs about 80 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 78 miles or 1h 50m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 178.1 miles or 3h 48m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 6h 2m
Traffic, exits, and arrival timing usually matter more near Casper, WY than in the middle of the route.
Before You Leave
+
Open the route before leaving Afton, 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.
+
Pick one backup stop option before the midpoint in case traffic changes your pacing.
Day 1
Settle into the route from Afton, WY
This is one driving day of about 356.3 miles and 7h 15m.
Your first comfortable stop window is around 78 miles from Afton, WY.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 2 real breaks rather than only quick fuel stops.
The longest stretch is on US 20 for about 80 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 14
5 decision points cluster between mile 0 and 353.9 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0 mi into trip|~0m in|East 4th Avenue
Turn left onto East 4th Avenue
Navigation decision point
5
33.2 mi into trip|~43m in|US 26; US 89
Turn right onto US 26; US 89
Lane positioning matters here
Use the right lane.
5
56 mi into trip|~1h 15m in|US 26; US 89; US 189; US 191 / South Highway 89
Enter roundabout onto US 26; US 89; US 189; US 191 / South Highway 89
Roundabout - know your exit number before entering
5
154.9 mi into trip|~3h 22m in|US 26; US 287 / South 1st Street
Turn right onto US 26; US 287 / South 1st Street
Lane positioning matters here
Use the straight lane.
5
353.9 mi into trip|~7h 8m in|US 20; US 26; US 87
Take the exit onto US 20; US 26; US 87 toward US 20 East, US 26 East, US 87 South: North Beverly Street, Bryan Stock Trail
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward US 20 East, US 26 East, US 87 South: Nor...
Fuel & Cost
Regular Gas
$62.63 one way
$125.27 round trip
$4.47/gal25.4 MPG avg125 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.67
$65.49
$130.99
premium
$4.99
$70.00
$140.00
diesel
$5.35
$75.05
$150.09
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$63
Meals
$25–$50
Total
$88–$113
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 124.7 kg one way.
Prices: EIA weekly data, 2026-06-01.
Driving Electric?
About $37 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
106.9
1
$37.41
$17.10
Efficient EV
89.1
1
$31.18
$14.25
EV Truck/SUV
142.5
1
$49.88
$22.80
Gas CO2
125 kg
EV CO2
42 kg (66% 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 Jun 2, 2026
Origin
Afton, WY
Afternoon
in Afton on Wednesday
Local time
2:55 PM
MDT
Current temp
72°F
Sunny
WSW 0 to 8 mph0% chanceLive forecast
Dense Fog Advisory
Dense Fog Advisory issued June 2 at 3:44AM MDT until June 2 at 9:00AM MDT by NWS Cheyenne WY
Destination
Casper, WY
Afternoon
in Casper on Wednesday
Local time
2:55 PM
MDT
Current temp
84°F
Mostly Sunny
W 5 to 15 mph1% chanceLive forecast
Dense Fog Advisory
Dense Fog Advisory issued June 2 at 3:44AM MDT until June 2 at 9:00AM MDT by NWS Cheyenne WY
75°F
Dubois, WY
178 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
12 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
7h 15m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
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...
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This trip features a mixed drive profile, with about 60% of the route utilizing highway travel. You'll spend a significant portion on US 20, which provides a mostly uninterrupted experience for up to 80 miles at a time. Expect a combination of faster highway sections and potentially slower local roads as you navigate through different towns and terrains. The road characteristics will evolve, offering a varied feel as you progress toward Casper.
60% highway — fuel and pacing are the main things to plan.
25 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 80 mi on US 20.
How Hard Is This Drive?
4/10
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 early in the drive near East 4th Avenue.
Driving Effort4/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
The route itself is not hard, but at 7h 15m, endurance matters. Plan breaks every 2-3 hours. The 14 decision points are all manageable with basic attention.
Where does it get tricky?
The main spots that need attention: near the start (East 4th Avenue): Navigation decision point; at 33.2 miles (US 26; US 89): Lane positioning matters here; at 56 miles (US 26; US 89; US 189; US 191 / South Highway 89): Roundabout - know your exit number before entering.
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
The longest stretch is about 80 miles on US 20. The full list of main roads is in the Roads section above.
Yes — we found about 6 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.
It helps. This is a long drive, so arriving tired and in the dark compounds. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Casper, WY before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 2 meaningful breaks. There are 6 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: near the start (East 4th Avenue): Navigation decision point; at 33.2 miles (US 26; US 89): Lane positioning matters here; at 56 miles (US 26; US 89; US 189; US 191 / South Highway 89): Roundabout - know your exit number before entering.
Yes — Grand Teton National Park. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 7.3 hours each way, a round trip means 14.5 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Casper, WY before the return drive.
