Sidney, MT to Polson, MT is 682.9 miles and takes about 11h 38m via I 90, I 94, and US 93, with a fuel budget near $109 and enough daylight to finish in a day. This long-haul drive stays within the Mountain West region, spanning the state of Montana. It's a trip that covers a significant distance, so you'll want to be prepared for a full day of driving or consider breaking it up over two days. The route is designed for efficiency, making it a straightforward choice for getting across the state.
Trip Pace
Best split across 2 days
Treat the return leg as its own travel day rather than an afterthought.
Break Rhythm
3 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
341.4 miles from Sidney, MT
A natural place for your longest stop of the day
, about 5h 47m into the drive
.
Main Roads
Road
Distance
Duration
I 90
357.8 mi
5h 52m
I 94
212.8 mi
3h 31m
US 93
60.6 mi
1h 15m
MT 16
48.9 mi
55m
North Central Avenue
2.5 mi
2m
Main Street
<0.1 mi
<1m
Longest stretch:
I 90
— 357.8 mi, about 5h 52m
Traffic on I-90
Hour-of-day weekday pattern from 32 FHWA count stations on your route.
Peak
4 PM
~651 veh/hr typical
· worst 823
Quietest
2 AM
~40 veh/hr
Peak-to-quiet ratio
16.3×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 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 Sidney, MT and Polson, MT.
1
Start on MT 16; MT 200
2.5 mi·2 min·North Central Avenue
2
Enter roundabout onto MT 16
135 ft·1 sec·MT 16
3
Continue on MT 16
49 mi·55 min·MT 16
4
Take the exit
0.3 mi·33 sec
5
Merge onto I 94
213 mi·3 hr 31 min·I 94
6
Merge onto I 90; US 87; US 212
2.8 mi·3 min·I 90; US 87; US 212
7
Continue on I 90; US 212
113 mi·1 hr 51 min·I 90; US 212
8
Continue on I 90; US 89; US 191
7.0 mi·6 min·I 90; US 89; US 191
9
Continue on I 90; US 191
113 mi·1 hr 54 min·I 90; US 191
Use the straight / slight right lanes.
10
Keep slight left at fork onto I 90
122 mi·1 hr 56 min·I 90
Toward I 90 West: Missoula
11
Take the exit onto US 93; MT 200
0.2 mi·24 sec·US 93; MT 200
Toward US 93 North, MT 200 West: Kalispell
12
Keep slight right at fork onto US 93; MT 200
60 mi·1 hr 14 min·US 93; MT 200
Toward US 93 North, MT 200 West: Kalispell
13
Turn left onto S-354
310 ft·6 sec·Main Street
14
Arrive at destination
S-354
Trip Plan
Given the 11h 38m estimated drive time, this is a trip best split over two days. Plan to stop in a town along I 90 or I 94 for your overnight stay to break up the nearly 700 miles. You'll have about 3 stops planned along the way, so factor those into your timing for fuel and rest. Keep an eye on fuel costs, with an estimated budget of $109 for the trip. Aim to depart early in the morning to maximize daylight hours, especially if you decide to tackle it in a single, long day.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
This drive is better paced as a 2-day trip.
Plan roughly 3 meaningful breaks for fuel, food, and rest.
The halfway point lands around 341.4 miles from Sidney, MT, or about 5h 47m into the drive.
The longest continuous stretch on this route runs about 357.8 miles.
Consider an overnight stop or starting very early.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 150 miles or 2h 36m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 341.4 miles or 5h 47m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Overnight split
Day 1 wrap after about 341.4 miles or 5h 47m
Stop before fatigue turns the last few hours into a grind. You want day two to start fresh, not just resumed.
Final approach
Final hour starts around 10h 24m
Traffic, exits, and arrival timing usually matter more near Polson, MT than in the middle of the route.
Before You Leave
+
Open the route before leaving Sidney, 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.
+
Pick one backup stop option before the midpoint in case traffic changes your pacing.
+
Treat this as a 2-day road trip and book the overnight stop before the busiest arrival window.
Day 1
Settle into the route from Sidney, MT
Aim for roughly 341 miles and 5.8 hours of wheel time on this day.
Day 2
Finish the approach into Polson, MT
Aim for roughly 341 miles and 5.8 hours of wheel time on this day.
Your first comfortable stop window is around 150 miles from Sidney, MT.
This route usually feels better as a 2-day drive than as one long push.
Plan about 3 real breaks rather than only quick fuel stops.
The longest stretch is on I 90 for about 357.8 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 2.5 and 622.4 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
4
2.5 mi into trip|~2m in|MT 16
Enter roundabout onto MT 16
Roundabout - know your exit number before entering
4
51.4 mi into trip|~58m in
Take the exit
Exit ramp - move to the correct lane early
5
500.4 mi into trip|~8h 26m 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
622.2 mi into trip|~10h 23m in|US 93; MT 200
Take the exit onto US 93; MT 200 toward US 93 North, MT 200 West: Kalispell
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward US 93 North, MT 200 West: Kalispell
6
622.4 mi into trip|~10h 23m in|US 93; MT 200
Keep slight right at fork onto US 93; MT 200 toward US 93 North, MT 200 West: Kalispell
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward US 93 North, MT 200 West: Kalispell
Fuel & Cost
Regular Gas
$120.05 one way
$240.09 round trip
$4.47/gal25.4 MPG avg239 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.67
$125.53
$251.06
premium
$4.99
$134.16
$268.32
diesel
$5.35
$143.84
$287.68
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$120
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$250–$360
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 238.9 kg one way.
Prices: EIA weekly data, 2026-06-01.
Driving Electric?
About $72 in charging
· 2 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
204.9
2
$71.70
$32.78
Efficient EV
170.7
1
$59.75
$27.32
EV Truck/SUV
273.2
3
$95.61
$43.71
Gas CO2
239 kg
EV CO2
80 kg (67% less)
Plan for 2 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 May 22, 2026
Origin
Sidney, MT
Afternoon
in Sidney on Wednesday
Local time
12:58 PM
MDT
Current temp
41°F
Chance Rain Showers
W 2 mph36% chanceLive forecast
Destination
Polson, MT
Afternoon
in Polson on Wednesday
Local time
12:58 PM
MDT
Current temp
40°F
Partly Cloudy
S 2 mph0% chanceLive forecast
47°F
Laurel, MT
225 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.
For long drives, weather on day two can matter just as much as conditions at departure, so check the whole travel window rather than only the first day.
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
1 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
11h 38m on the road
This is long enough that the arrival forecast matters almost as much as departure conditions. Recheck both ends before you roll.
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 100% on main roads, with no segments on surface roads. You'll spend the majority of your time on interstates, including a stretch of 357.8 miles on I 90. Expect a rural cruising feel for much of the trip, punctuated by longer interstate segments. The route is built for steady progress across Montana.
100% 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: 357.8 mi on I 90.
How Hard Is This Drive?
6/10
This is a straightforward highway drive that stays mostly on I 90 and I 94. You will hit about 8 points where you need to pay attention to lane position or signs. The trickiest moment comes around 2.5 miles in near MT 16.
Driving Effort6/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 682.9 miles you will encounter 8 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 2.5 miles (MT 16): Roundabout - know your exit number before entering; at 51.4 miles: Exit ramp - move to the correct lane early; at 500.4 miles (I 90): Highway fork - watch signs carefully.
Moderate complexity with 3 natural rest stops along the way.
Solo Traveler
11h 38m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 357.8 miles on I 90. The full list of main roads is in the Roads section above.
Yes — a 2-day pace is more comfortable than one long haul. A sensible stopping point is after roughly 341 miles on day one.
Yes — we found about 28 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.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Polson, MT before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 3 meaningful breaks. There are 28 rest areas along the route for bathroom stops.
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 2.5 miles (MT 16): Roundabout - know your exit number before entering; at 51.4 miles: Exit ramp - move to the correct lane early; at 500.4 miles (I 90): Highway fork - watch signs carefully.
Not recommended in a single day. At 11.6 hours each way, a round trip means 23.3 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Polson, MT before the return drive.
