Roundup, MT to Great Falls, MT is 181.5 miles and takes about 3h 39m via US 87, with a fuel budget near $29 and enough daylight to finish in a day. This is a straightforward, same-day trip primarily on US Highway 87, connecting two points within Montana's Mountain West region. You'll find this drive to be a focused highway journey, ideal for those who prefer to cover ground efficiently. With a highway share of 98%, it’s a route designed for steady progress rather than leisurely sightseeing. Consider this your practical option for getting from Roundup to Great Falls without unnecessary detours.
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
90.8 miles from Roundup, MT
A natural place for your longest stop of the day
, about 1h 56m into the drive
.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 3h 39m. Total distance: 181.5 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
This route is overwhelmingly a highway-focused drive, with 98% of the journey on well-maintained highways. You'll spend most of your time on US 87, a road designed for efficient travel. The longest uninterrupted stretch you'll encounter is a significant 162.4 miles, all on US 87, meaning you can settle in for a good portion of the drive without frequent turns. Expect a steady pace, with the Truck Bypass also factoring into the main roads. This highway character makes for a predictable and consistent driving experience.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 15 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
US 87 is the longest continuous segment at about 162.4 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on US 87 and US Highway 87. Navigation is very simple - set it and forget it for most of the drive. The trickiest moment comes around 44.9 miles in near US 87; MT 200.
Driving Effort1/10
Very easy - short and simple to drive
Balances navigation complexity with total wheel time.
The drive from Roundup, MT to Great Falls, MT is easy. At 3h 39m with 98% highway, most drivers will find it relaxed and low-stress.
Where does it get tricky?
The main spots that need attention: at 44.9 miles (US 87; MT 200): Navigation decision point; at 75.5 miles (1st Avenue North): Navigation decision point; at 157.7 miles: Roundabout - know your exit number before entering.
Critical Maneuvers
5 of 6 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
3
44.9 mi into trip|~1h 3m in|US 87; MT 200
Turn left onto US 87; MT 200
Navigation decision point
4
75.5 mi into trip|~1h 38m in|1st Avenue North
Turn right onto 1st Avenue North
Navigation decision point
5
157.7 mi into trip|~3h 8m in
Enter roundabout
Roundabout - know your exit number before entering
4
181.3 mi into trip|~3h 38m in|5th Avenue South
Turn left onto 5th Avenue South
Navigation decision point
5
181.5 mi into trip|~3h 39m in|4th Street South
Turn right onto 4th Street South
Navigation decision point
Main Roads
Road
Distance
Duration
US 87
162.4 mi
3h 16m
US Highway 87
14.7 mi
15m
Truck Bypass
2.6 mi
3m
Main Street
0.5 mi
<1m
6th Street South
0.4 mi
<1m
1st Avenue North
0.3 mi
<1m
5th Avenue South
0.2 mi
<1m
4th Street South
<0.1 mi
<1m
Longest stretch:
US 87
— 162.4 mi, about 3h 16m
Turn-by-Turn Driving Directions
Step-by-step road directions between Roundup, MT and Great Falls, MT.
1
Start on US 12; US 87
0.5 mi·45 sec·Main Street
2
Turn slight left onto US 87
44 mi·1 hr 2 min·US 87
3
Turn left onto US 87; MT 200
31 mi·34 min·US 87; MT 200
4
Turn right onto 1st Avenue North
0.3 mi·29 sec·1st Avenue North
5
Continue on US 191
2.6 mi·3 min·Truck Bypass
6
Continue on US 87; US 191; MT 200
15 mi·15 min·US Highway 87
7
Continue on US 87; MT 3; MT 200
64 mi·1 hr 9 min·US 87; MT 3; MT 200
8
Turn slight right
0.3 mi·20 sec
9
Enter roundabout
172 ft·2 sec
10
Continue
0.1 mi·7 sec
11
Continue on US 87; US 89; MT 3; MT 200
23 mi·29 min·US 87; US 89; MT 3; MT 200
12
Turn right onto I 15 Business
0.4 mi·38 sec·6th Street South
13
Turn left onto 5th Avenue South
0.2 mi·39 sec·5th Avenue South
14
Turn right onto 4th Street South
162 ft·7 sec·4th Street South
15
Arrive at destination
4th Street South
Trip Plan
Given the 3-hour 39-minute duration, this is comfortably a one-day trip. Aim to depart Roundup in the morning to give yourself ample time and flexibility. With a fuel cost estimated at $29, filling up before you leave or at your starting point is advisable, though you'll find opportunities along the way. While it's a single-day drive, the 162.4-mile stretch on US 87 means you’ll want to plan a break beforehand. Keep an eye on your fuel gauge, especially as you enter longer stretches of highway, to ensure you're always comfortable.
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 90.8 miles from Roundup, MT, or about 1h 56m into the drive.
The longest continuous stretch on this route runs about 162.4 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 40 miles or 56m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 90.8 miles or 1h 56m 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 58m
Traffic, exits, and arrival timing usually matter more near Great Falls, MT than in the middle of the route.
Before You Leave
+
Open the route before leaving Roundup, MT 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 Roundup, MT
This is one driving day of about 181.5 miles and 3h 39m.
Your first comfortable stop window is around 40 miles from Roundup, MT.
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 US 87 for about 162.4 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 90.8 mi from Roundup, MT
· 1h 56m into the drive
Place data sourced from public business listings. Hours and availability may vary.
Fuel & Cost
Regular Gas
$28.76 one way
$57.52 round trip
$4.03/gal25.4 MPG avg64 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.22
$30.15
$60.30
premium
$4.53
$32.38
$64.75
diesel
$5.61
$40.07
$80.15
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$29
Meals
$25–$50
Total
$54–$79
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 63.5 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $19 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
54.4
0
$19.06
$8.71
Efficient EV
45.4
0
$15.88
$7.26
EV Truck/SUV
72.6
0
$25.41
$11.62
Gas CO2
64 kg
EV CO2
21 kg (67% 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
Roundup, MT
Late night
in Roundup on Saturday
Local time
12:43 AM
MDT
Current temp
46°F
Unavailable
Live forecast
Destination
Great Falls, MT
Late night
in Great Falls on Saturday
Local time
12:43 AM
MDT
Current temp
68°F
Unavailable
Live forecast
37°F
Moore, MT
91 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
22 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
3h 39m 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 Roundup, MT to Great Falls, MT covers 181.5 miles and takes about 3h 39m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are US 87, US Highway 87, Truck Bypass. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 90.8 miles from Roundup, MT. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $28.76 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
An early start around 7-8 AM gets you there with plenty of daylight left. A late afternoon start means arriving after dark. Morning is better.
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 Roundup, MT to Great Falls, MT is easy. At 3h 39m with 98% highway, most drivers will find it relaxed and low-stress.
The main spots that need attention: at 44.9 miles (US 87; MT 200): Navigation decision point; at 75.5 miles (1st Avenue North): Navigation decision point; at 157.7 miles: Roundabout - know your exit number before entering.
The route from Roundup, MT to Great Falls, MT does not surface many named destination signs beyond the main corridor.
