Big Sky to Missoula is 240.3 miles and takes about 4h 7m via I 90 and Gallatin Road, with a fuel budget near $43 and enough daylight to finish in a day. This all-Montana route stays within the Mountain West region, offering a straightforward drive with minimal fuss. Most of the travel occurs on I 90, making it a relatively easy trip for those looking to cover ground efficiently. With a recommended one-day drive time, you can easily fit this into your itinerary without needing an overnight stop.
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
120.1 miles from Big Sky, MT
A natural place for your longest stop of the day
, about 2h 12m into the drive
.
Main Roads
Road
Distance
Duration
I 90
191.1 mi
3h 5m
Gallatin Road
33.9 mi
41m
Lone Mountain Trail
7.1 mi
11m
Jackrabbit Lane
6.8 mi
7m
East Broadway Street
0.6 mi
<1m
Van Buren Street
0.2 mi
<1m
I 90 Business
0.2 mi
<1m
Access
0.1 mi
<1m
Longest stretch:
I 90
— 191.1 mi, about 3h 5m
Traffic on I-90
Hour-of-day weekday pattern from 24 FHWA count stations on your route.
Peak
4 PM
~514 veh/hr typical
· worst 730
Quietest
2 AM
~37 veh/hr
Peak-to-quiet ratio
13.9×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 104 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Big Sky, MT and Missoula, MT.
1
Start on Access
0.1 mi·32 sec·Access
2
Turn right onto MT 64
7.1 mi·11 min·Lone Mountain Trail
3
At end of road, turn left onto US 191
34 mi·41 min·Gallatin Road
4
Continue on MT 85
6.8 mi·7 min·Jackrabbit Lane
5
Turn left
0.2 mi·30 sec
6
Merge onto I 90
79 mi·1 hr 18 min·I 90
Use the straight / slight right lanes.
7
Keep slight left at fork onto I 90
113 mi·1 hr 46 min·I 90
Toward I 90 West: Missoula
8
Take the exit onto I 90 Business; US 12
0.2 mi·26 sec·I 90 Business; US 12
Toward US 12 West, I 90 Business
9
Enter roundabout onto I 90 Bus; US 12
206 ft·2 sec·Van Buren Street
10
Continue on I 90 Bus; US 12
212 ft·3 sec·Van Buren Street
11
Enter roundabout onto I 90 Bus; US 12
92 ft·1 sec·Van Buren Street
12
Continue on I 90 Bus; US 12
0.1 mi·11 sec·Van Buren Street
13
Turn right onto I 90 Bus; US 12
0.6 mi·55 sec·East Broadway Street
Use the straight / left / right lanes.
14
Turn right onto North Higgins Avenue
19 ft·0 sec·North Higgins Avenue
15
Arrive at destination
North Higgins Avenue
Trip Plan
Given the 4h 7m estimated drive time, leaving Big Sky in the morning allows ample time to reach Missoula before evening. The route has only one recommended stop, so you can choose to make it a brief break or a more leisurely one. Keep an eye on your fuel gauge, as the longest stretch without services could be significant; plan your refueling accordingly. The $43 fuel estimate is a good starting point for budgeting your trip. Since this is a single-day drive, you have the flexibility to depart on your schedule.
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 120.1 miles from Big Sky, MT, or about 2h 12m into the drive.
The longest continuous stretch on this route runs about 191.1 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 53 miles or 1h 5m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 120.1 miles or 2h 12m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 26m
Traffic, exits, and arrival timing usually matter more near Missoula, MT than in the middle of the route.
Before You Leave
+
Open the route before leaving Big Sky, 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 Big Sky, MT
This is one driving day of about 240.3 miles and 4h 7m.
Your first comfortable stop window is around 53 miles from Big Sky, 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 191.1 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 10
5 decision points cluster between mile 48.1 and 239.6 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
48.1 mi into trip|~1h in|I 90
Merge onto I 90
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
5
126.8 mi into trip|~2h 19m in|I 90
Keep slight left at fork onto I 90 toward I 90 West: Missoula
Highway fork - watch signs carefully
Toward I 90 West: Missoula
5
239.3 mi into trip|~4h 6m in|I 90 Business; US 12
Take the exit onto I 90 Business; US 12 toward US 12 West, I 90 Business
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward US 12 West, I 90 Business
5
239.5 mi into trip|~4h 6m in|I 90 Bus; US 12 / Van Buren Street
Enter roundabout onto I 90 Bus; US 12 / Van Buren Street
Roundabout - know your exit number before entering
5
239.6 mi into trip|~4h 6m in|I 90 Bus; US 12 / Van Buren Street
Enter roundabout onto I 90 Bus; US 12 / Van Buren Street
Roundabout - know your exit number before entering
Fuel & Cost
Regular Gas
$43.28 one way
$86.56 round trip
$4.58/gal25.4 MPG avg84 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.78
$45.20
$90.41
premium
$5.11
$48.31
$96.61
diesel
$6.18
$58.46
$116.91
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$43
Meals
$25–$50
Total
$68–$93
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 84.1 kg one way.
Prices: EIA weekly data, 2026-10-12.
Driving Electric?
About $25 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
72.1
0
$25.23
$11.53
Efficient EV
60.1
0
$21.03
$9.61
EV Truck/SUV
96.1
1
$33.64
$15.38
Gas CO2
84 kg
EV CO2
28 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 Oct 17, 2026
Origin
Big Sky, MT
Morning
in Big Sky on Sunday
Local time
6:26 AM
MDT
Current temp
56°F
Mostly Sunny
SSW 15 mph0% chanceLive forecast
High Wind Warning
High Wind Warning issued October 17 at 1:05PM MDT until October 18 at 12:00AM MDT by NWS Great Falls MT
High Wind Warning
High Wind Warning issued October 17 at 1:05PM MDT until October 18 at 12:00AM MDT by NWS Great Falls MT
Destination
Missoula, MT
Morning
in Missoula on Sunday
Local time
6:26 AM
MDT
Current temp
69°F
Partly Sunny
WSW 12 to 15 mph0% chanceLive forecast
High Wind Warning
High Wind Warning issued October 17 at 1:05PM MDT until October 18 at 12:00AM MDT by NWS Great Falls MT
High Wind Warning
High Wind Warning issued October 17 at 1:05PM MDT until October 18 at 12:00AM MDT by NWS Great Falls MT
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
13 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
4h 7m 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?
This drive is 80% highway, meaning you'll spend most of your time on I 90. You'll encounter a long stretch of 191.1 miles on I 90 before transitioning to surface roads like Gallatin Road and Lone Mountain Trail. Expect mostly highway cruising, with fewer exits and more open road as you travel between these two Montana locations.
80% highway — fuel and pacing are the main things to plan.
15 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 191.1 mi on I 90.
How Hard Is This Drive?
3/10
This is a straightforward highway drive that stays mostly on I 90 and Gallatin Road. There are only a few real navigation decisions along the way. The trickiest moment comes around 48.1 miles in near I 90.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 4h 7m drive. You will face about 10 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: at 48.1 miles (I 90): Merge point - match speed before joining. Lane positioning matters here; at 126.8 miles (I 90): Highway fork - watch signs carefully; at 239.3 miles (I 90 Business; US 12): Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Big Sky is an alpine ski and golf resort community in Montana. The community's two large ski resorts, Big Sky Resort and Moonlight Basin, merged in 2013. In 2020, it was home to about 3,600 people.
Missoula is a medium-sized city in Western Montana with a population of about 73,000 (2020). The hub of five valleys in the northwest region of the state, or Glacier Country, the town boasts the University of Montana, the Rattlesnake Recreation Area, and a multitude of recreational opportunities, along with an active and colorful downtown.
Top landmarks
•Fort Missoula
•Gleim Building — building in Missoula, Montana, US
•Masonic Lodge — Masonic lodge in Missoula, Montanna
The longest stretch is about 191.1 miles on I 90. The full list of main roads is in the Roads section above.
Yes — we found about 10 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: at 48.1 miles (I 90): Merge point - match speed before joining. Lane positioning matters here; at 126.8 miles (I 90): Highway fork - watch signs carefully; at 239.3 miles (I 90 Business; US 12): Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Possible but tiring. At 4.1 hours each way, an in-and-out day trip would put you behind the wheel for 8.3 hours — manageable with a long break at Missoula, MT, but most travelers stay overnight.
