Bozeman, MT to Roundup, MT is 194 miles and takes about 3h 24m via I 90 and US 87, with a fuel budget near $31 and enough daylight to finish in a day. This trip stays within the Mountain West region, so expect a consistent landscape as you travel east. The route is primarily highway driving, making it a straightforward option if you're looking for a direct connection between these two Montana towns. With a recommended one-day drive, you can easily fit this into your schedule without needing to book overnight accommodations.
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
97 miles from Bozeman, MT
A natural place for your longest stop of the day
, about 1h 39m into the drive
.
Main Roads
Road
Distance
Duration
I 90
142.6 mi
2h 22m
Roundup Road
44.4 mi
48m
US 87
3.5 mi
5m
West Main Street
1.4 mi
3m
US Highway 87 East
1.3 mi
1m
Main Street
0.2 mi
<1m
North Willson Avenue
<0.1 mi
<1m
Longest stretch:
I 90
— 142.6 mi, about 2h 22m
Turn-by-Turn Driving Directions
Step-by-step road directions between Bozeman, MT and Roundup, MT.
1
Start on North Willson Avenue
130 ft·11 sec·North Willson Avenue
2
Turn left onto I 90 Business; US 191; MT 84
1.4 mi·3 min·West Main Street
3
Take the exit
0.3 mi·43 sec
4
Merge onto I 90; US 191
23 mi·23 min·I 90; US 191
5
Continue on I 90; US 89; US 191
6.9 mi·6 min·I 90; US 89; US 191
6
Continue on I 90; US 191
112 mi·1 hr 52 min·I 90; US 191
7
Take the exit
0.3 mi·34 sec
8
Turn left onto US Highway 87 East
1.3 mi·1 min·US Highway 87 East
9
Take the exit onto US 87
3.5 mi·5 min·US 87
10
Turn slight left onto US 87
44 mi·48 min·Roundup Road
11
Turn left onto US 12; US 87
0.2 mi·20 sec·Main Street
12
Arrive at destination
US 12; US 87
Trip Plan
Given the relatively short 3h 24m driving time, you have flexibility with your departure. Leaving Bozeman in the morning allows you to reach Roundup with plenty of daylight remaining. The longest stretch without a major exit is over 140 miles on I 90, so ensure you have adequate fuel before embarking on that segment. While there's only one recommended stop, you might want to plan for a quick break around the halfway point or before transitioning to the final surface road sections of US 87 and Roundup Road.
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 97 miles from Bozeman, MT, or about 1h 39m into the drive.
The longest continuous stretch on this route runs about 142.6 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 43 miles or 45m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 97 miles or 1h 39m 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 45m
Traffic, exits, and arrival timing usually matter more near Roundup, MT than in the middle of the route.
Before You Leave
+
Open the route before leaving Bozeman, 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 Bozeman, MT
This is one driving day of about 194 miles and 3h 24m.
Your first comfortable stop window is around 43 miles from Bozeman, 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 I 90 for about 142.6 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 6
5 decision points cluster between mile 0 and 145.8 — 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|I 90 Business; US 191; MT 84 / West Main Street
Turn left onto I 90 Business; US 191; MT 84 / West Main Street
Navigation decision point
4
1.4 mi into trip|~3m in
Take the exit
Exit ramp - move to the correct lane early
3
1.7 mi into trip|~4m in|I 90; US 191
Merge onto I 90; US 191
Merge point - match speed before joining
3
144.3 mi into trip|~2h 27m in
Take the exit
Exit ramp - move to the correct lane early
3
145.8 mi into trip|~2h 29m in|US 87
Take the exit onto US 87
Exit ramp - move to the correct lane early
Fuel & Cost
Regular Gas
$30.74 one way
$61.48 round trip
$4.03/gal25.4 MPG avg68 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.22
$32.22
$64.45
premium
$4.53
$34.61
$69.21
diesel
$5.61
$42.83
$85.67
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$31
Meals
$25–$50
Total
$56–$81
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 67.9 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $20 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
58.2
0
$20.37
$9.31
Efficient EV
48.5
0
$16.97
$7.76
EV Truck/SUV
77.6
0
$27.16
$12.42
Gas CO2
68 kg
EV CO2
23 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 20, 2026
Origin
Bozeman, MT
Late night
in Bozeman on Tuesday
Local time
3:09 AM
MDT
Current temp
48°F
Unavailable
Live forecast
Destination
Roundup, MT
Late night
in Roundup on Tuesday
Local time
3:09 AM
MDT
Current temp
28°F
Unavailable
Live forecast
49°F
Columbus, MT
97 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
20 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
3h 24m 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?
You'll spend about 76% of this 194-mile drive on highways, with the longest continuous stretch covering 142.6 miles on I 90. After leaving I 90, you'll transition to surface roads like Roundup Road and US 87 for the final portion of the trip. Expect more rural cruising once you're off the interstate, with fewer exits and a more open feel.
76% highway — fuel and pacing are the main things to plan.
12 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 142.6 mi on I 90.
How Hard Is This Drive?
2/10
This is a straightforward highway drive that stays mostly on I 90 and Roundup Road. Navigation is very simple - set it and forget it for most of the drive. The trickiest moment comes early in the drive near I 90 Business; US 191; MT 84 / West Main Street.
Driving Effort2/10
Very easy - short and simple to drive
Balances navigation complexity with total wheel time.
The drive from Bozeman, MT to Roundup, MT is easy. At 3h 24m with 76% highway, most drivers will find it relaxed and low-stress.
Where does it get tricky?
The main spots that need attention: near the start (I 90 Business; US 191; MT 84 / West Main Street): Navigation decision point; at 1.4 miles: Exit ramp - move to the correct lane early; at 1.7 miles (I 90; US 191): Merge point - match speed before joining.
Bozeman is a city in Montana's Yellowstone Country. Set in the middle of the Rocky Mountains, this college town is a place for experiencing the great outdoors around the year, and for those days the weather makes you want to stay indoors there are a number of museums and galleries to explore.
The longest stretch is about 142.6 miles on I 90. 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.
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 MT 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 (I 90 Business; US 191; MT 84 / West Main Street): Navigation decision point; at 1.4 miles: Exit ramp - move to the correct lane early; at 1.7 miles (I 90; US 191): Merge point - match speed before joining.
Possible but tiring. At 3.4 hours each way, an in-and-out day trip would put you behind the wheel for 6.8 hours — manageable with a long break at Roundup, MT, but most travelers stay overnight.
