Casper to North Rock Springs is 234.6 miles and takes about 4h 19m via Dwight D. Eisenhower Highway, with a fuel budget near $38 and enough daylight to finish in a day. This trip stays within Wyoming, connecting two points in the Mountain West region. Expect a drive that primarily uses surface roads, offering a more grounded feel than a pure interstate experience. With a recommended one-day duration, it's a manageable stretch for those looking to cover ground efficiently within the state.
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
117.3 miles from Casper, WY
A natural place for your longest stop of the day
, about 2h 19m into the drive
.
Main Roads
Road
Distance
Duration
Dwight D. Eisenhower Highway
106 mi
1h 42m
County Road 308
63.7 mi
1h 12m
US 287
44.1 mi
50m
Casper West Belt
7.3 mi
8m
US 20
5.1 mi
6m
Yellowstone Road
1.9 mi
3m
West Spruce Street
1.5 mi
2m
Bryan Stock Trail
1.1 mi
1m
Longest stretch:
Dwight D. Eisenhower Highway
— 106 mi, about 1h 42m
Traffic on I-80
Hour-of-day weekday pattern from 8 FHWA count stations on your route.
Peak
2 PM
~480 veh/hr typical
· worst 725
Quietest
2 AM
~91 veh/hr
Peak-to-quiet ratio
5.3×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 49 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Casper, WY and North Rock Springs, 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
Continue on WY 257
7.3 mi·8 min·Casper West Belt
11
Turn right onto WY 220
64 mi·1 hr 12 min·County Road 308
12
Continue on US 287; WY 789
44 mi·50 min·US 287; WY 789
13
Turn right onto I 80 Bus; US 30 Bus; WY 789
1.5 mi·2 min·West Spruce Street
14
Take the ramp onto WY 789
0.6 mi·1 min·WY 789
15
Merge onto I 80; US 30; WY 789
106 mi·1 hr 42 min·Dwight D. Eisenhower Highway
16
Take the exit onto US 191
0.4 mi·50 sec·US 191
Toward US 191 North
17
Turn right onto US 191
0.8 mi·1 min·Elk Street
18
Turn left onto CR 58
1.9 mi·3 min·Yellowstone Road
19
Turn left onto Mesa Drive
0.7 mi·2 min·Mesa Drive
20
Arrive at destination
Mesa Drive
Trip Plan
To make the most of this 4h 19m drive, consider leaving Casper in the morning to ensure you have ample daylight. Since this is a single-day trip, you have flexibility in your timing. Plan for one stop to break up the 234.6 miles, perhaps around the halfway point. Keep an eye on your fuel gauge, as the estimated cost is $38, and services might be spaced out on the surface road portions. A good tip is to top off your tank before leaving Casper, as you'll encounter the longest stretch on the Dwight D. Eisenhower Highway early in your drive.
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 117.3 miles from Casper, WY, or about 2h 19m into the drive.
The longest continuous stretch on this route runs about 106 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 52 miles or 1h 4m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 117.3 miles or 2h 19m 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 34m
Traffic, exits, and arrival timing usually matter more near North Rock Springs, 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 234.6 miles and 4h 19m.
Your first comfortable stop window is around 52 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 Dwight D. Eisenhower Highway for about 106 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 230.9 — 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
230.9 mi into trip|~4h 11m in|US 191
Take the exit onto US 191 toward US 191 North
Exit ramp - move to the correct lane early
Toward US 191 North
Fuel & Cost
Regular Gas
$36.57 one way
$73.13 round trip
$3.96/gal25.4 MPG avg82 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$38.54
$77.09
premium
$4.47
$41.32
$82.65
diesel
$4.80
$44.30
$88.59
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$37
Meals
$25–$50
Total
$62–$87
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 82.1 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $25 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
70.4
0
$24.63
$11.26
Efficient EV
58.7
0
$20.53
$9.38
EV Truck/SUV
93.8
1
$32.84
$15.01
Gas CO2
82 kg
EV CO2
27 kg (67% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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 18, 2026
Origin
Casper, WY
Late night
in Casper on Sunday
Local time
3:34 AM
MDT
Current temp
97°F
Sunny
ESE 2 to 8 mph6% chanceLive forecast
Flood Watch
Flood Watch issued July 18 at 2:37AM MDT until July 18 at 10:00PM MDT by NWS Riverton WY
Heat Advisory
Heat Advisory issued July 18 at 1:23AM MDT until July 19 at 9:00PM MDT by NWS Rapid City SD
Destination
North Rock Springs, WY
Late night
in North Rock Springs on Sunday
Local time
3:34 AM
MDT
Current temp
91°F
Sunny then Slight Chance Showers And Thunderstorms
W 2 to 8 mph23% chanceLive forecast
Flood Watch
Flood Watch issued July 18 at 2:37AM MDT until July 18 at 10:00PM MDT by NWS Riverton WY
Heat Advisory
Heat Advisory issued July 18 at 1:23AM MDT until July 19 at 9:00PM MDT by NWS Rapid City SD
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
6 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
4h 19m 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?
Your drive will involve 21% on the Dwight D. Eisenhower Highway, with the longest continuous stretch on this highway being 106 miles. After this highway segment, you'll transition to County Road 308 and US 287, which make up the majority of the route as surface roads. You'll notice a shift from faster highway speeds to more rural cruising as you move onto these county and US routes.
Only 21% highway — the rest is turn-by-turn surface driving.
20 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 106 mi on Dwight D. Eisenhower Highway.
How Hard Is This Drive?
3/10
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 Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 4h 19m 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
High-altitude sections with notable climbs
7,099 ft5,201 ft
Total Climb
2,477 ft
Total Descent
1,197 ft
Highest Point
7,099 ft
~150.8 mi in
Elevation Range
1,898 ft
Notable High Points
5,426 ft at ~16.8 miles+29 ft prominence
6,995 ft at ~117.3 miles+326 ft prominence
7,099 ft at ~150.8 miles+401 ft prominence
6,821 ft at ~184.3 miles+124 ft prominence
Detours Along the Way
Tagged by where each one fits in your drive — first break, midpoint, final stretch.
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 106 miles on Dwight D. Eisenhower Highway. The full list of main roads is in the Roads section above.
Yes — we found about 8 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.
Yes, with realistic expectations. Build in a stop roughly every 2 hours, have snacks and activities ready, and check the Nearby Places tabs for kid-friendly stops along the way.
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.
Possible but tiring. At 4.3 hours each way, an in-and-out day trip would put you behind the wheel for 8.7 hours — manageable with a long break at North Rock Springs, WY, but most travelers stay overnight.
