Fort Hall, ID to Post Falls, ID is 526.6 miles and takes about 8h 41m via I 90, with a fuel budget near $86 and enough daylight to finish in a day. This trip stays within the Mountain West region, offering a long-haul drive that's best split over two days. Given the distance and duration, you'll want to plan for an overnight stay to avoid fatigue. Consider this route if you're looking for a straightforward drive with minimal navigation changes.
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
263.3 miles from Fort Hall, ID
A natural place for your longest stop of the day
, about 4h 12m into the drive
.
Main Roads
Road
Distance
Duration
I 90
285.8 mi
4h 49m
Veterans Memorial Highway
236.7 mi
3h 42m
West Agency Road
1 mi
1m
East Ross Fork Road
0.5 mi
<1m
North Eagle Road
0.5 mi
<1m
North Spokane Street
0.3 mi
1m
North Treaty Highway
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
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 Fort Hall, ID and Post Falls, ID.
1
Start on B Avenue
85 ft·5 sec·B Avenue
2
Turn right onto 4th Street
0.1 mi·27 sec·4th Street
3
At end of road, turn right onto US 91
0.3 mi·32 sec·North Treaty Highway
4
Turn left onto West Agency Road
1.0 mi·1 min·West Agency Road
5
Turn right onto North Eagle Road
0.5 mi·57 sec·North Eagle Road
6
Turn left onto East Ross Fork Road
0.5 mi·59 sec·East Ross Fork Road
7
Take the ramp
0.3 mi·34 sec
8
Merge onto I 15
237 mi·3 hr 42 min·Veterans Memorial Highway
9
Take the exit
0.5 mi·1 min
Toward I 90 West: Missoula
10
Merge onto I 90
286 mi·4 hr 49 min·I 90
Toward I 90 West: Missoula
11
Take the exit
0.4 mi·50 sec
Toward Spokane Street
12
Turn right onto I 90 Bus
0.3 mi·1 min·North Spokane Street
13
Turn left onto West 10th Avenue
0.2 mi·38 sec·West 10th Avenue
14
Arrive at destination
West 10th Avenue
Trip Plan
For this 8h 41m drive, splitting it into two days is highly recommended. Aim to leave early to maximize daylight, especially if you plan to drive straight through. With two recommended stops, you can break up the 526.6 miles into manageable segments. Keep an eye on your fuel, as the estimated cost is $86, and plan your refueling stops accordingly. A good place to consider an overnight stay would be around the halfway point to ensure a relaxed pace.
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 263.3 miles from Fort Hall, ID, or about 4h 12m 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 116 miles or 1h 51m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 263.3 miles or 4h 12m 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 263.3 miles or 4h 12m
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 38m
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 Fort Hall, 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 Fort Hall, ID
Aim for roughly 263 miles and 4.3 hours of wheel time on this day.
Day 2
Finish the approach into Post Falls, ID
Aim for roughly 263 miles and 4.3 hours of wheel time on this day.
Your first comfortable stop window is around 116 miles from Fort Hall, 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 12
5 decision points cluster between mile 0 and 2.4 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0 mi into trip|~0m in|4th Street
Turn right onto 4th Street
Navigation decision point
6
0.1 mi into trip|~0m in|US 91 / North Treaty Highway
At end of road, turn right onto US 91 / North Treaty Highway
Complex interchange - multiple decisions in a short stretch
4
0.4 mi into trip|~1m in|West Agency Road
Turn left onto West Agency Road
Navigation decision point
4
1.4 mi into trip|~2m in|North Eagle Road
Turn right onto North Eagle Road
Navigation decision point
4
2.4 mi into trip|~4m in
Take the ramp
Navigation decision point
Fuel & Cost
Regular Gas
$82.08 one way
$164.16 round trip
$3.96/gal25.4 MPG avg184 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$86.52
$173.03
premium
$4.47
$92.76
$185.51
diesel
$4.80
$99.43
$198.86
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$82
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$212–$322
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 184.2 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $55 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
158
1
$55.29
$25.28
Efficient EV
131.7
1
$46.08
$21.06
EV Truck/SUV
210.6
2
$73.72
$33.70
Gas CO2
184 kg
EV CO2
62 kg (66% 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
Fort Hall, ID
Evening
in Fort Hall on Saturday
Local time
7:26 PM
MDT
Current temp
94°F
Slight Chance Showers And Thunderstorms
WNW 6 mph23% 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 mph29% 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 41m 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 route is primarily a highway drive, with 54% of the total mileage on interstates. You'll experience a longest stretch of 285.8 miles on I 90 before transitioning to surface roads like Veterans Memorial Highway and West Agency Road. Expect a mix of rural cruising and what could be denser traffic closer to urban areas as you progress north. The shift from interstate to local roads will require adjusting your speed and awareness.
54% highway, the rest on surface roads — varied driving throughout.
14 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
At 8h 41m, this is a long-haul route where pacing matters more than any single turn. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near 4th Street.
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 41m, endurance matters. Plan breaks every 2-3 hours. The 12 decision points are all manageable with basic attention.
Where does it get tricky?
The main spots that need attention: near the start (4th Street): Navigation decision point; at 0.1 miles (US 91 / North Treaty Highway): Complex interchange - multiple decisions in a short stretch; at 0.4 miles (West Agency Road): Navigation decision point.
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 263 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 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. There are 28 rest areas along the route for bathroom stops.
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: near the start (4th Street): Navigation decision point; at 0.1 miles (US 91 / North Treaty Highway): Complex interchange - multiple decisions in a short stretch; at 0.4 miles (West Agency Road): Navigation decision point.
Not recommended in a single day. At 8.7 hours each way, a round trip means 17.4 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.
