Connecting Casper to Gillette is a straightforward 133.1-mile journey that typically takes about 2 hours and 34 minutes to complete. Because of the manageable distance, this trip is perfectly suited for a single-day excursion, allowing you to reach your destination without the need for an overnight stay. You will primarily utilize a mix of I-25, WY 387, and State Highway 59 South to navigate across the Mountain West region. Budgeting approximately $21 for fuel should cover your transit costs comfortably. Whether you are traveling for business or local exploration, this route offers a reliable path between these two Wyoming hubs.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Break Rhythm
1 planned break
A short stop every 2 to 3 hours is enough for this drive.
Midpoint
66.5 miles from Casper, WY
A natural place for your longest stop of the day
, about 1h 16m into the drive
.
Main Roads
Road
Distance
Duration
WY 387
51.3 mi
58m
State Highway 59 South
32.8 mi
35m
I 25
21 mi
19m
Horseshoe Road
17.9 mi
20m
South Douglas Highway
5 mi
9m
US 20
2.1 mi
2m
Bryan Stock Trail
1.1 mi
1m
East Sunlight Drive
0.5 mi
1m
Longest stretch:
WY 387
— 51.3 mi, about 58m
Turn-by-Turn Driving Directions
Step-by-step road directions between Casper, WY and Gillette, 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
Continue on I 25; US 87
21 mi·19 min·I 25; US 87
8
Take the exit
0.4 mi·50 sec
Toward Horse Ranch Creek Road
9
Turn right onto WY 259
18 mi·20 min·Horseshoe Road
10
Turn right onto WY 387
51 mi·58 min·WY 387
11
Turn left onto WY 59
33 mi·35 min·State Highway 59 South
12
Continue on WY 59
5.0 mi·9 min·South Douglas Highway
13
Turn left onto East 4th Street
0.4 mi·1 min·East 4th Street
14
Arrive at destination
East 4th Street
Trip Plan
Since you only have one planned stop along the way, keep your itinerary flexible to accommodate the 2 hour and 34 minute travel time. I recommend checking your fuel levels before departing Casper, as the $21 estimated cost can fluctuate based on your vehicle's efficiency and local prices. Because the route is relatively short, you have the advantage of choosing a departure time that avoids peak traffic hours to ensure a smoother experience. Pay close attention to road signage when transitioning between I-25 and the state highway sections to stay on track. Making your single stop during the longer WY 387 stretch is a smart way to break up the drive and maintain your energy.
Morning Departure
Leave by 9 AM and you'll arrive before lunch.
Evening Departure
Even a 4 PM departure gets you there before dark in summer.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 66.5 miles from Casper, WY, or about 1h 16m into the drive.
The longest continuous stretch on this route runs about 51.3 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 29 miles or 33m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 66.5 miles or 1h 16m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 2h 4m
Traffic, exits, and arrival timing usually matter more near Gillette, 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 133.1 miles and 2h 34m.
Your first comfortable stop window is around 29 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 WY 387 for about 51.3 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 8
5 decision points cluster between mile 0.3 and 43.5 — 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
4
25.3 mi into trip|~28m in
Take the exit toward Horse Ranch Creek Road
Exit ramp - move to the correct lane early
Toward Horse Ranch Creek Road
4
25.6 mi into trip|~29m in|WY 259 / Horseshoe Road
Turn right onto WY 259 / Horseshoe Road
Navigation decision point
4
43.5 mi into trip|~49m in|WY 387
Turn right onto WY 387
Navigation decision point
Fuel & Cost
Regular Gas
$21.09 one way
$42.18 round trip
$4.03/gal25.4 MPG avg47 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.22
$22.11
$44.22
premium
$4.53
$23.74
$47.49
diesel
$5.61
$29.39
$58.77
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$21
Meals
$25–$50
Total
$46–$71
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 46.6 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $14 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
39.9
0
$13.98
$6.39
Efficient EV
33.3
0
$11.65
$5.32
EV Truck/SUV
53.2
0
$18.63
$8.52
Gas CO2
47 kg
EV CO2
16 kg (66% 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 Sunday
Local time
12:01 AM
MDT
Current temp
44°F
Unavailable
Live forecast
Destination
Gillette, WY
Late night
in Gillette on Sunday
Local time
12:01 AM
MDT
Current temp
73°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
29 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
2h 34m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
More Details
What kind of drive is this?
Expect a drive defined by high-speed highway travel, as 81% of your journey stays on major routes. You will settle into a steady rhythm behind the wheel, particularly during the longest uninterrupted stretch of 51.3 miles on WY 387. The road transitions between interstate segments and state highways, maintaining a consistent, highway-focused character throughout the drive. You should be prepared for open stretches that demand steady focus rather than technical maneuvering. This is a practical, no-nonsense path designed for efficiency rather than winding, slow-paced sightseeing.
81% highway — fuel and pacing are the main things to plan.
14 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 51.3 mi on WY 387.
How Hard Is This Drive?
2/10
This is a straightforward highway drive that stays mostly on WY 387 and State Highway 59 South. Navigation is very simple - set it and forget it for most of the drive. The trickiest moment comes around 0.3 miles in.
Driving Effort2/10
Very easy - short and simple to drive
Balances navigation complexity with total wheel time.
The drive from Casper, WY to Gillette, WY is easy. At 2h 34m with 81% highway, most drivers will find it relaxed and low-stress.
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 25.3 miles: Exit ramp - move to the correct lane early.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 2h 34m. Total distance: 133.1 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
The longest stretch is about 51.3 miles on WY 387. The full list of main roads is in the Roads section above.
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 25.3 miles: Exit ramp - move to the correct lane early.
Yes. A round trip is manageable in a single day if you plan a break at Gillette, WY before heading back.
