Rock Springs, WY to Sundance, WY is 412.8 miles and takes about 7h 27m via Dwight D. Eisenhower Highway and I 90, with a fuel budget near $67 and enough daylight to finish in a day. This trip stays within the Mountain West region, primarily traveling across Wyoming. You'll experience a mix of highway speeds and potentially more rural cruising, making it a straightforward, single-day drive. Consider this route if you're looking for an efficient way to cover ground between these two points in Wyoming, with a manageable fuel cost for the distance.
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
206.4 miles from Rock Springs, WY
A natural place for your longest stop of the day
, about 3h 40m into the drive
.
Main Roads
Road
Distance
Duration
Dwight D. Eisenhower Highway
103.9 mi
1h 40m
WY 220
63.7 mi
1h 12m
I 90
56.5 mi
56m
WY 387
51.3 mi
58m
3rd Street
44.1 mi
50m
State Highway 59 South
32.8 mi
35m
I 25
20.1 mi
18m
Horseshoe Road
17.9 mi
20m
Longest stretch:
Dwight D. Eisenhower Highway
— 103.9 mi, about 1h 40m
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 Rock Springs, WY and Sundance, WY.
1
Start on Collins Street
84 ft·7 sec·Collins Street
2
Turn right onto Agate Street
422 ft·18 sec·Agate Street
3
At end of road, turn left onto Edgar Street
0.1 mi·25 sec·Edgar Street
4
Turn right onto Virginia Street
0.2 mi·40 sec·Virginia Street
5
At end of road, turn right onto James Drive
0.2 mi·32 sec·James Drive
6
At end of road, turn left onto WY 376
0.4 mi·48 sec·South Side Belt Route
7
Turn right onto I 80 Business; US 30 Business
0.4 mi·38 sec·9th Street
8
Take the ramp
0.4 mi·29 sec
9
Merge onto I 80; US 30
104 mi·1 hr 40 min·Dwight D. Eisenhower Highway
10
Take the exit onto WY 789
0.4 mi·52 sec·WY 789
Toward I 80 Business East, WY 789 North: Rawlins
11
Turn left onto I 80 Bus; US 30 Bus; WY 789
1.7 mi·2 min·West Spruce Street
12
Turn left onto US 287; WY 789
44 mi·50 min·3rd Street
13
Continue on WY 220
64 mi·1 hr 12 min·WY 220
14
Turn left onto WY 257
7.3 mi·8 min·Casper West Belt
15
Continue on US 20; US 26
3.0 mi·3 min·US 20; US 26
16
Turn left
0.4 mi·50 sec
Toward I 25 North, US 87 North: Midwest
17
Merge onto I 25; US 87
20 mi·18 min·I 25; US 87
18
Take the exit
0.4 mi·50 sec
Toward Horse Ranch Creek Road
19
Turn right onto WY 259
18 mi·20 min·Horseshoe Road
20
Turn right onto WY 387
51 mi·58 min·WY 387
21
Turn left onto WY 59
33 mi·35 min·State Highway 59 South
22
Continue on WY 59
1.7 mi·2 min·South Douglas Highway
23
Take the exit
436 ft·13 sec
24
Turn straight onto South Garner Lake Road
4.0 mi·6 min·South Garner Lake Road
25
Take the ramp onto I 90; US 14; US 16
57 mi·56 min·I 90; US 14; US 16
26
Take the exit onto I 90 Business
0.3 mi·33 sec·I 90 Business
27
Turn right onto I 90 Business; US 14
0.7 mi·1 min·US Highway 14
28
Continue on I 90 Business; US 14
0.5 mi·44 sec·South West Street
29
Continue on I 90 Business; US 14
0.3 mi·30 sec·East Cleveland Street
30
Arrive at destination
I 90 Business; US 14
Trip Plan
Given the 7h 27m estimated drive time, starting your trip in Rock Springs early in the morning is advisable to make the most of daylight. With only 2 recommended stops, plan your breaks strategically, perhaps one around the halfway point to stretch your legs and refuel. Keep an eye on your fuel gauge, especially during the 103.9-mile stretch on the Dwight D. Eisenhower Highway, as services might be spaced further apart. The total fuel cost is estimated at $67, so budget accordingly before you depart.
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 206.4 miles from Rock Springs, WY, or about 3h 40m into the drive.
The longest continuous stretch on this route runs about 103.9 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 91 miles or 1h 30m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 206.4 miles or 3h 40m 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 25m
Traffic, exits, and arrival timing usually matter more near Sundance, WY than in the middle of the route.
Before You Leave
+
Open the route before leaving Rock Springs, 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 Rock Springs, WY
This is one driving day of about 412.8 miles and 7h 27m.
Your first comfortable stop window is around 91 miles from Rock Springs, 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 Dwight D. Eisenhower Highway for about 103.9 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 22
5 decision points cluster between mile 0 and 0.6 — 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|Agate Street
Turn right onto Agate Street
Navigation decision point
5
0.1 mi into trip|~0m in|Edgar Street
At end of road, turn left onto Edgar Street
Navigation decision point
5
0.2 mi into trip|~0m in|Virginia Street
Turn right onto Virginia Street
Navigation decision point
5
0.4 mi into trip|~1m in|James Drive
At end of road, turn right onto James Drive
Navigation decision point
5
0.6 mi into trip|~2m in|WY 376 / South Side Belt Route
At end of road, turn left onto WY 376 / South Side Belt Route
Navigation decision point
Fuel & Cost
Regular Gas
$64.34 one way
$128.68 round trip
$3.96/gal25.4 MPG avg144 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$67.82
$135.64
premium
$4.47
$72.71
$145.42
diesel
$4.80
$77.94
$155.89
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$64
Meals
$25–$50
Total
$89–$114
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 144.4 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $43 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
123.8
1
$43.34
$19.81
Efficient EV
103.2
1
$36.12
$16.51
EV Truck/SUV
165.1
2
$57.79
$26.42
Gas CO2
144 kg
EV CO2
48 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
Rock Springs, WY
Morning
in Rock Springs on Saturday
Local time
9:51 AM
MDT
Current temp
57°F
Chance Showers And Thunderstorms then Mostly Cloudy
NE 5 to 10 mph36% chanceLive forecast
Heat Advisory
Heat Advisory issued July 16 at 7:09PM MDT until July 19 at 9:00PM MDT by NWS Rapid City SD
Flood Watch
Flood Watch issued July 16 at 2:56PM MDT until July 16 at 11:00PM MDT by NWS Riverton WY
Destination
Sundance, WY
Morning
in Sundance on Saturday
Local time
9:51 AM
MDT
Current temp
63°F
Partly Cloudy
NE 6 mph13% chanceLive forecast
Heat Advisory
Heat Advisory issued July 16 at 7:09PM MDT until July 19 at 9:00PM MDT by NWS Rapid City SD
Flood Watch
Flood Watch issued July 16 at 2:56PM MDT until July 16 at 11:00PM MDT by NWS Riverton WY
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 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 27m 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.
Devils Tower National Monument
National Monument
The Tower is an astounding geologic feature that protrudes out of the prairie surrounding the Black Hills. It is considered sacred by Northern Plains Indians and indigenous people. Hundreds of paralle...
20 mi from route
~49 min detour
$25
near mile 398.5
Park Closure: Temporary closure of some rock climbing routes to protect falcon nesting sites.
Park Closure: The campground is closed for the season.
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This drive is mostly highway, with 55% of the total distance on major roads like the Dwight D. Eisenhower Highway and I 90. The longest continuous stretch you'll encounter is 103.9 miles on the Dwight D. Eisenhower Highway. Expect about 45% of your travel time on surface roads, likely transitioning from faster highway speeds to more rural cruising as you approach your destination. You'll notice the shift from high-speed interstate travel to potentially slower, more scenic sections.
55% highway, the rest on surface roads — varied driving throughout.
30 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 103.9 mi on Dwight D. Eisenhower Highway.
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 Agate Street.
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 27m, endurance matters. Plan breaks every 2-3 hours. The 22 decision points are all manageable with basic attention.
Where does it get tricky?
The main spots that need attention: near the start (Agate Street): Navigation decision point; at 0.1 miles (Edgar Street): Navigation decision point; at 0.2 miles (Virginia Street): Navigation decision point.
Rock Springs is the biggest city in Sweetwater County in Southwest Wyoming. It had a population of 23,000 in 2019. Rock Springs' nickname is: "Home of 56 Nationalities". The town has a rich western and coal mining history.
Mixed highway & surface route profile with national parks nearby.
Frequently Asked Questions
The longest stretch is about 103.9 miles on Dwight D. Eisenhower Highway. The full list of main roads is in the Roads section above.
Yes — we found about 9 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 Sundance, 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 9 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 (Agate Street): Navigation decision point; at 0.1 miles (Edgar Street): Navigation decision point; at 0.2 miles (Virginia Street): Navigation decision point.
Yes — Devils Tower National Monument. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 7.5 hours each way, a round trip means 14.9 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Sundance, WY before the return drive.
