Greybull, WY to Rock Springs, WY is 266.8 miles and takes about 5h 15m via Highway 28, with a fuel budget near $47 and enough daylight to finish in a day. This trip stays within the Mountain West region, connecting two points in Wyoming. It's a straightforward drive that's suitable for a single day, offering a practical way to travel between these two locations. The route is mostly highway driving, making it efficient for covering ground.
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
133.4 miles from Greybull, WY
A natural place for your longest stop of the day
, about 2h 38m into the drive
.
Main Roads
Road
Distance
Duration
Highway 28
66.5 mi
1h 15m
Farson Mercantile
38.1 mi
43m
South 6th Street
37.5 mi
42m
West Big Horn Avenue
32.4 mi
39m
US 20
31 mi
36m
US 26
18.9 mi
21m
West 2nd Street
18.2 mi
20m
South Main Street
9.8 mi
11m
Longest stretch:
Highway 28
— 66.5 mi, about 1h 15m
Turn-by-Turn Driving Directions
Step-by-step road directions between Greybull, WY and Rock Springs, WY.
1
Start on North 7th Street
82 ft·8 sec·North 7th Street
2
Turn left onto Greybull Avenue
268 ft·15 sec·Greybull Avenue
3
Turn right onto US 16; US 20; WY 789
37 mi·42 min·South 6th Street
4
Turn right onto Russell Avenue
0.1 mi·16 sec·Russell Avenue
5
Continue on North Railway Avenue
0.4 mi·1 min·North Railway Avenue
6
Turn right onto US 20; WY 789
32 mi·39 min·West Big Horn Avenue
Use the straight / left / right lanes.
7
Continue on US 20; WY 789
0.8 mi·2 min·North 6th Street
Use the slight left / right lanes.
8
Turn right onto US 20; WY 789
0.9 mi·2 min·Shoshoni Street
Use the left / slight right lanes.
9
Continue on US 20; WY 789
31 mi·36 min·US 20; WY 789
Use the straight / right lanes.
10
Turn right onto US 26; WY 789
18 mi·20 min·West 2nd Street
11
Continue on US 26; WY 789
19 mi·21 min·US 26; WY 789
Use the straight lane.
12
Continue on WY 789
9.8 mi·11 min·South Main Street
13
Turn left onto US 287; WY 789
8.4 mi·9 min·East Main Street
14
Continue on WY 28
66 mi·1 hr 15 min·Highway 28
15
Turn left onto US 191
38 mi·43 min·Farson Mercantile
16
Continue on US 191
2.3 mi·5 min·Elk Street
17
Turn left onto I 80 Business; US 30 Business
0.3 mi·27 sec·Bridger Avenue
18
Turn right onto M Street
0.2 mi·33 sec·M Street
19
Continue on Broadway Street
401 ft·16 sec·Broadway Street
20
Turn left onto F Street
230 ft·11 sec·F Street
21
Turn left onto 2nd Street
0.2 mi·33 sec·2nd Street
22
Turn right onto Edgar Street
0.6 mi·1 min·Edgar Street
23
At end of road, turn right onto Agate Street
422 ft·23 sec·Agate Street
24
Turn left onto Collins Street
84 ft·3 sec·Collins Street
25
Arrive at destination
Collins Street
Trip Plan
Given the 5h 15m duration, leaving Greybull in the morning is recommended to maximize daylight. With only one designated stop at Farson Mercantile, plan your breaks accordingly. The longest stretch without a major town is 66.5 miles on Highway 28, so ensure you have adequate fuel before this segment. The estimated fuel cost is around $47, but it's always wise to check current prices. This single-day route allows for flexibility; you can depart when ready and arrive in Rock Springs the same day.
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 133.4 miles from Greybull, WY, or about 2h 38m into the drive.
The longest continuous stretch on this route runs about 66.5 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 59 miles or 1h 9m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 133.4 miles or 2h 38m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 16m
Traffic, exits, and arrival timing usually matter more near Rock Springs, WY than in the middle of the route.
Before You Leave
+
Open the route before leaving Greybull, 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 Greybull, WY
This is one driving day of about 266.8 miles and 5h 15m.
Your first comfortable stop window is around 59 miles from Greybull, 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 Highway 28 for about 66.5 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 15
5 decision points cluster between mile 0 and 266.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
4
0 mi into trip|~0m in|Greybull Avenue
Turn left onto Greybull Avenue
Navigation decision point
5
38.1 mi into trip|~43m in|US 20; WY 789 / West Big Horn Avenue
Turn right onto US 20; WY 789 / West Big Horn Avenue
Lane positioning matters here
Use the straight / left / right lanes.
5
265.6 mi into trip|~5h 11m in|M Street
Turn right onto M Street
Navigation decision point
5
266 mi into trip|~5h 12m in|2nd Street
Turn left onto 2nd Street
Navigation decision point
5
266.8 mi into trip|~5h 15m in|Collins Street
Turn left onto Collins Street
Navigation decision point
Fuel & Cost
Regular Gas
$41.59 one way
$83.17 round trip
$3.96/gal25.4 MPG avg93 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$43.83
$87.67
premium
$4.47
$46.99
$93.99
diesel
$4.80
$50.38
$100.75
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$42
Meals
$25–$50
Total
$67–$92
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 93.3 kg one way.
Prices: EIA weekly data, 2026-07-13.
Station data from NREL Alternative Fuel Stations database.
Driving Electric?
About $28 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
80
0
$28.01
$12.81
Efficient EV
66.7
0
$23.35
$10.67
EV Truck/SUV
106.7
1
$37.35
$17.08
Gas CO2
93 kg
EV CO2
31 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
Greybull, WY
Late night
in Greybull on Saturday
Local time
4:20 AM
MDT
Current temp
64°F
Slight Chance Showers And Thunderstorms then Mostly Cloudy
NW 1 to 6 mph10% chanceLive forecast
Heat Advisory
Heat Advisory issued July 17 at 11:53PM MDT until July 20 at 6:00PM MDT by NWS Cheyenne WY
Heat Advisory
Heat Advisory issued July 17 at 3:07PM MDT until July 19 at 9:00PM MDT by NWS Rapid City SD
Destination
Rock Springs, WY
Late night
in Rock Springs on Saturday
Local time
4:20 AM
MDT
Current temp
56°F
Partly Cloudy
WSW 7 mph1% chanceLive forecast
Heat Advisory
Heat Advisory issued July 17 at 11:53PM MDT until July 20 at 6:00PM MDT by NWS Cheyenne WY
Heat Advisory
Heat Advisory issued July 17 at 3:07PM 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
8 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
5h 15m 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?
About 44% of this 266.8-mile route is on highways. You'll encounter a 66.5-mile stretch on Highway 28 before transitioning. The profile is mixed highway and surface roads, meaning you'll experience both faster highway cruising and potentially slower speeds on other surfaces. Expect a noticeable change in road type and speed as you move between these sections.
44% highway, the rest on surface roads — varied driving throughout.
25 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 66.5 mi on Highway 28.
How Hard Is This Drive?
3/10
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 Greybull Avenue.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 5h 15m drive. You will face about 15 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: near the start (Greybull Avenue): Navigation decision point; at 38.1 miles (US 20; WY 789 / West Big Horn Avenue): Lane positioning matters here; at 265.6 miles (M 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 66.5 miles on Highway 28. The full list of main roads is in the Roads section above.
Yes — we found about 3 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.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 3 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 (Greybull Avenue): Navigation decision point; at 38.1 miles (US 20; WY 789 / West Big Horn Avenue): Lane positioning matters here; at 265.6 miles (M Street): Navigation decision point.
Not recommended in a single day. At 5.3 hours each way, a round trip means 10.5 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Rock Springs, WY before the return drive.
