Chubbuck, ID to Post Falls, ID is 533.8 miles and takes about 8h 46m via I-15 BUS, I-86, and I-90, with a fuel budget near $84 and enough daylight to finish in a day, but is best split over two days. This long-haul drive stays within the Mountain West region, primarily traversing Idaho. You'll spend most of your time on major interstates, making for a straightforward trip if you're looking for efficiency. Consider this route if you want to cover a significant distance within Idaho without complex navigation.
Trip Pace
Best split across 2 days
Treat the return leg as its own travel day rather than an afterthought.
Break Rhythm
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
266.9 miles from Chubbuck, ID
A natural place for your longest stop of the day
, about 4h 14m into the drive
.
Main Roads
Road
Distance
Duration
I 90
285.8 mi
4h 49m
I 15 BUS
244.5 mi
3h 49m
I 86
0.8 mi
<1m
Yellowstone Avenue
0.6 mi
<1m
North Spokane Street
0.3 mi
1m
West 10th Avenue
0.2 mi
<1m
Longest stretch:
I 90
— 285.8 mi, about 4h 49m
Traffic on I-90
Hour-of-day weekday pattern from 58 FHWA count stations on your route.
Peak
4 PM
~981 veh/hr typical
· worst 1,230
Quietest
2 AM
~52 veh/hr
Peak-to-quiet ratio
18.9×
busier at peak than in the quiet hours
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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 Chubbuck, ID and Post Falls, ID.
1
Start on US 91
0.6 mi·59 sec·Yellowstone Avenue
2
Take the ramp
0.2 mi·27 sec
3
Merge onto I 86
0.8 mi·52 sec·I 86
4
Keep slight left at fork
0.6 mi·40 sec
Toward Idaho Falls
5
Merge onto I 15 BUS
244 mi·3 hr 49 min·I 15 BUS
6
Take the exit
0.5 mi·1 min
Toward I 90 West: Missoula
7
Merge onto I 90
286 mi·4 hr 49 min·I 90
Toward I 90 West: Missoula
8
Take the exit
0.4 mi·50 sec
Toward Spokane Street
9
Turn right onto I 90 Bus
0.3 mi·1 min·North Spokane Street
10
Turn left onto West 10th Avenue
0.2 mi·38 sec·West 10th Avenue
11
Arrive at destination
West 10th Avenue
Trip Plan
Given the 8h 46m estimated duration, this drive is best split into two days. A good stopping point would be midway, allowing you to break up the 533.8 miles. Aim to leave early in the morning to maximize daylight, especially if you decide to tackle it in one go. With an estimated fuel cost of $84, keep an eye on your fuel gauge, particularly during the 285.8-mile segment on I-90 where services might be less frequent. Plan for at least two stops to stretch your legs and refuel.
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 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 266.9 miles from Chubbuck, ID, or about 4h 14m into the drive.
The longest continuous stretch on this route runs about 285.8 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 117 miles or 1h 51m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 266.9 miles or 4h 14m 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 266.9 miles or 4h 14m
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 7h 43m
Traffic, exits, and arrival timing usually matter more near Post Falls, ID than in the middle of the route.
Before You Leave
+
Open the route before leaving Chubbuck, ID 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 Chubbuck, ID
Aim for roughly 267 miles and 4.4 hours of wheel time on this day.
Day 2
Finish the approach into Post Falls, ID
Aim for roughly 267 miles and 4.4 hours of wheel time on this day.
Your first comfortable stop window is around 117 miles from Chubbuck, ID.
This route usually feels better as a 2-day drive than as one long push.
Plan about 2 real breaks rather than only quick fuel stops.
The longest stretch is on I 90 for about 285.8 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 1.6 and 533.6 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
1.6 mi into trip|~2m in
Keep slight left at fork toward Idaho Falls
Highway fork - watch signs carefully
Toward Idaho Falls
4
246.6 mi into trip|~3h 52m in
Take the exit toward I 90 West: Missoula
Exit ramp - move to the correct lane early
Toward I 90 West: Missoula
4
247.1 mi into trip|~3h 54m in|I 90
Merge onto I 90 toward I 90 West: Missoula
Merge point - match speed before joining
Toward I 90 West: Missoula
4
532.9 mi into trip|~8h 43m in
Take the exit toward Spokane Street
Exit ramp - move to the correct lane early
Toward Spokane Street
4
533.6 mi into trip|~8h 45m in|West 10th Avenue
Turn left onto West 10th Avenue
Navigation decision point
Fuel & Cost
Regular Gas
$83.20 one way
$166.40 round trip
$3.96/gal25.4 MPG avg187 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$87.70
$175.40
premium
$4.47
$94.02
$188.05
diesel
$4.80
$100.79
$201.58
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$83
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$213–$323
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 186.8 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $56 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
160.1
1
$56.05
$25.62
Efficient EV
133.5
1
$46.71
$21.35
EV Truck/SUV
213.5
2
$74.73
$34.16
Gas CO2
187 kg
EV CO2
62 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
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 Jul 16, 2026
Origin
Chubbuck, ID
Evening
in Chubbuck on Saturday
Local time
7:26 PM
MDT
Current temp
94°F
Chance Showers And Thunderstorms
WNW 6 mph26% chanceLive forecast
Special Weather Statement
Special Weather Statement issued July 16 at 3:42PM MDT by NWS Boise ID
Flash Flood Warning
Flash Flood Warning issued July 16 at 2:23PM MDT until July 16 at 5:30PM MDT by NWS Pocatello ID
Destination
Post Falls, ID
Evening
in Post Falls on Saturday
Local time
6:26 PM
PDT
Current temp
100°F
Slight Chance Showers And Thunderstorms
E 3 mph39% chanceLive forecast
Special Weather Statement
Special Weather Statement issued July 16 at 3:42PM MDT by NWS Boise ID
Flash Flood Warning
Flash Flood Warning issued July 16 at 2:23PM MDT until July 16 at 5:30PM MDT by NWS Pocatello ID
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
1 hour earlier
The destination clock does not match departure time, so double-check hotel check-in windows and late arrival plans.
Temperature spread
6 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
8h 46m 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 trip is almost entirely highway driving, with a 99% highway share. The longest continuous stretch you'll encounter is 285.8 miles on I-90. Expect minimal time on surface roads, as the interstate system connects these two points quite directly. You'll experience long stretches of rural cruising punctuated by occasional urban merging as you pass through populated areas.
99% highway — fuel and pacing are the main things to plan.
11 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 285.8 mi on I 90.
How Hard Is This Drive?
4/10
This is a straightforward highway drive that stays mostly on I 90 and I 15 BUS. There are only a few real navigation decisions along the way. The trickiest moment comes around 1.6 miles in.
Driving Effort4/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
The route itself is not hard, but at 8h 46m, endurance matters. Plan breaks every 2-3 hours. The 8 decision points are all manageable with basic attention.
Where does it get tricky?
The main spots that need attention: at 1.6 miles: Highway fork - watch signs carefully; at 246.6 miles: Exit ramp - move to the correct lane early; at 247.1 miles (I 90): Merge point - match speed before joining.
The longest stretch is about 285.8 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 267 miles on day one.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
It helps. This is a long drive, so arriving tired and in the dark compounds. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Post Falls, ID 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 2 meaningful breaks. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
Mostly yes along the main roads, but rural stretches through ID 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 1.6 miles: Highway fork - watch signs carefully; at 246.6 miles: Exit ramp - move to the correct lane early; at 247.1 miles (I 90): Merge point - match speed before joining.
Not recommended in a single day. At 8.8 hours each way, a round trip means 17.5 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Post Falls, ID before the return drive.
