Trip from Gillette, WY to Casper, WY

Drive Time

2h 35m

Distance

133.3 mi

215 km

Drive Score

8/10

Great drive

Same Day?

Yes, doable

Fuel Cost

$21

one way

EV Charging

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station data

Best Time to Leave

Save up to 31 min

4 AM

2h 25m ★

6 AM

2h 35m

8 AM

2h 56m

10 AM

2h 42m

12 PM

2h 40m

3 PM

2h 44m

5 PM

2h 55m

8 PM

2h 29m

Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.

Best Time Drive vs Fly

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Trip Overview

The drive from Gillette, WY to Casper, WY covers 133.3 miles and takes about 2h 35m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.

The route leans on WY 387, State Highway 59 South, I 25 for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 51.3 miles on WY 387. At current regular gas prices, budget about $21.12 one way before food or hotel costs.

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

66.7 miles from Gillette, WY

A natural place for your longest stop of the day , about 1h 18m into the drive .

Drive Character

This is a 2h 35m highway drive covering 133.3 miles, with most of the trip on WY 387 and State Highway 59 South. The longest continuous stretch is about 51.3 miles on WY 387.

Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.

There are about 12 navigation steps in the underlying route data, so the final approach matters more than the middle miles.

WY 387 is the longest continuous segment at about 51.3 miles.

How Hard Is This Drive?

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 0.4 miles in near WY 59 / South Douglas Highway.

Route Complexity 2/10

Very easy - short and simple to drive

The drive from Gillette, WY to Casper, WY is easy. At 2h 35m with 94% highway, most drivers will find it relaxed and low-stress.

Where does it get tricky?

The main spots that need attention: at 0.4 miles (WY 59 / South Douglas Highway): Navigation decision point; at 38.3 miles (WY 387): Navigation decision point; at 89.5 miles (WY 259): Navigation decision point.

Critical Maneuvers

5 of 8 key points

These are the spots where you need to pay the most attention. Preview them before you drive.

4

0.4 mi into trip | ~1m in | WY 59 / South Douglas Highway

Turn right onto WY 59 / South Douglas Highway

Navigation decision point

4

38.3 mi into trip | ~46m in | WY 387

Turn right onto WY 387

Navigation decision point

4

89.5 mi into trip | ~1h 45m in | WY 259

Turn left onto WY 259

Navigation decision point

6

107.6 mi into trip | ~2h 5m in

Take the exit toward I 25 South: Casper

Exit ramp - move to the correct lane early

Toward I 25 South: Casper

5

130.9 mi into trip | ~2h 28m 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...

Main Roads

Road	Distance	Duration
WY 387	51.3 mi	58m
State Highway 59 South	32.8 mi	35m
I 25	22.9 mi	22m
WY 259	18.1 mi	20m
South Douglas Highway	5 mi	9m
Bryan Stock Trail	1.1 mi	2m
East Sunlight Drive	0.9 mi	3m
East 4th Street	0.4 mi	1m

Longest stretch: WY 387 — 51.3 mi, about 58m

Turn-by-Turn Driving Directions

Step-by-step road directions between Gillette, WY and Casper, WY.

1

Start on East 4th Street

0.4 mi · 1 min · East 4th Street

2

Turn right onto WY 59

5.0 mi · 9 min · South Douglas Highway

3

Continue on WY 59

33 mi · 35 min · State Highway 59 South

4

Turn right onto WY 387

51 mi · 58 min · WY 387

5

Turn left onto WY 259

18 mi · 20 min · WY 259

6

Take the exit

0.4 mi · 52 sec

Toward I 25 South: Casper

7

Merge onto I 25; US 87

21 mi · 19 min · I 25; US 87

8

Continue on I 25; US 20; US 26; US 87

2.0 mi · 2 min · I 25; US 20; US 26; US 87

9

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

10

At end of road, turn left onto I 25 Business

1.1 mi · 2 min · Bryan Stock Trail

11

Turn left onto East Sunlight Drive

0.9 mi · 3 min · East Sunlight Drive

12

Arrive at destination

North Sunlight Drive

Trip Plan

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 66.7 miles from Gillette, WY, or about 1h 18m 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 80 miles or 1h 34m in

Use this first pause for coffee, a restroom break, and a quick traffic check ahead.

Halfway reset

Around 66.7 miles or 1h 18m 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 7m

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 Gillette, 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 Gillette, WY

This is one driving day of about 133.3 miles and 2h 35m.

Your first comfortable stop window is around 80 miles from Gillette, 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.

Halfway Point

Midpoint

About 66.7 mi from Gillette, WY · 1h 18m into the drive

Mid-route town

Meal stop

Wright, WY

67 mi into the route

Best for: Lunch, fuel, and a longer reset

This sits close to the middle of the route, so it works well for the longest stop of the day.

Popular next leg

Wright, WY to Casper, WY

94.4 mi · 1h 49m

Pacing Suggestions

Wright, WY

Fuel and coffee

A short stop after about 80 miles helps settle the day before fatigue starts building.

Wright, WY

Meal break

The midpoint is around 66.7 miles from Gillette, WY, which is a good place for a longer meal and fuel stop.

Arriving in Casper, WY

The final approach into Casper, WY usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.

Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Casper, WY.

These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.

Fuel & Cost

Regular Gas

$21.12 one way

$42.25 round trip

$4.03/gal 25.4 MPG avg 47 kg CO₂

Fuel Type	$/gal	One Way	Round Trip
midgrade	$4.23	$22.20	$44.41
premium	$4.53	$23.77	$47.54
diesel	$5.64	$29.61	$59.23

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, 2026-04-06.

Driving Electric?

About $14 in charging · 0 stops · 66% less CO₂

Vehicle Type	kWh	DC Fast	Home Charge
Average EV	40	$14.00	$6.40
Efficient EV	33.3	$11.66	$5.33
EV Truck/SUV	53.3	$18.66	$8.53

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 data refreshed 3 days ago

Origin

Gillette, WY

Afternoon in Gillette on Sunday

Local time

4:49 PM

MDT

Current temp

32°F

Unavailable

Live forecast

Destination

Casper, WY

Afternoon in Casper on Sunday

Local time

4:49 PM

MDT

Current temp

39°F

Unavailable

Live forecast

Along the Route

34°F

Wright, WY

67 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

7 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 35m 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.

Frequently Asked Questions

The drive from Gillette, WY to Casper, WY covers 133.3 miles and takes about 2h 35m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.

The main roads are WY 387, State Highway 59 South, I 25. Most of the drive stays on highways, so watch for ramps and exits.

This is a comfortable same-day trip.

The midpoint is about 66.7 miles from Gillette, WY. Look for rest areas, gas stations, or food options near the halfway mark.

At current regular gas prices, expect to spend about $21.12 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.

Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.

Plan about 1 meaningful break for fuel, food, or rest. A short stop every 2 to 3 hours is enough for this drive.

The drive from Gillette, WY to Casper, WY is easy. At 2h 35m with 94% highway, most drivers will find it relaxed and low-stress.

The main spots that need attention: at 0.4 miles (WY 59 / South Douglas Highway): Navigation decision point; at 38.3 miles (WY 387): Navigation decision point; at 89.5 miles (WY 259): Navigation decision point.

The route from Gillette, WY to Casper, WY does not surface many named destination signs beyond the main corridor.