Post Falls to Shelley is 494.6 miles and takes about 8h 10m via I 90 and I 15, with a fuel budget near $83 and enough daylight to finish in a day. This trip stays within Idaho, traversing the Mountain West region. It's a mostly highway drive, making for a straightforward transit between these two points. Planning for an overnight stop is recommended given the duration. This route is best suited for travelers prioritizing efficient travel over extensive sightseeing.
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
247.3 miles from Post Falls, ID
A natural place for your longest stop of the day
, about 4h 11m into the drive
.
Main Roads
Road
Distance
Duration
I 90
285.1 mi
4h 47m
I 15
203.4 mi
3h 11m
North 800 East
2.3 mi
3m
South 45th West
1 mi
1m
North State Street
0.7 mi
1m
North Spokane Street
0.4 mi
1m
Anderson Road
0.3 mi
<1m
West 65th South
0.2 mi
<1m
Longest stretch:
I 90
— 285.1 mi, about 4h 47m
Traffic on I-90
Hour-of-day weekday pattern from 116 FHWA count stations on your route.
Peak
4 PM
~944 veh/hr typical
· worst 1,226
Quietest
2 AM
~52 veh/hr
Peak-to-quiet ratio
18.2×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 105 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 Post Falls, ID and Shelley, ID.
1
Start on West 10th Avenue
0.2 mi·40 sec·West 10th Avenue
2
Turn right onto North Spokane Street
0.4 mi·1 min·North Spokane Street
3
Turn left
0.4 mi·51 sec
4
Merge onto I 90
285 mi·4 hr 47 min·I 90
5
Take the exit
0.5 mi·1 min
Toward I 15 South: Dillon, Idaho Falls
6
Merge onto I 15
203 mi·3 hr 11 min·I 15
7
Take the exit
0.2 mi·30 sec
Toward Shelley
8
Enter roundabout onto West 65th South
376 ft·6 sec·West 65th South
9
Continue on West 65th South
0.1 mi·9 sec·West 65th South
10
Enter roundabout onto South 45th West
107 ft·1 sec·South 45th West
11
Continue on South 45th West
1.0 mi·1 min·South 45th West
12
Continue on North 800 East
2.3 mi·3 min·North 800 East
13
Continue on Anderson Road
0.3 mi·31 sec·Anderson Road
14
At end of road, turn right onto US 91
0.7 mi·1 min·North State Street
15
Turn sharp left onto East Center Street
31 ft·0 sec·East Center Street
16
Arrive at destination
East Center Street
Trip Plan
Given the 8h 10m estimated drive time, splitting this trip over two days is a good idea. Aim to depart early to maximize daylight, especially if you plan to stop for the night. Keep an eye on your fuel levels, as services can be spaced out on interstates in this region. The longest stretch without a significant town is 285.1 miles on I 90, so ensure you're fueled up before entering that segment. You'll have two recommended stops, so plan your overnight near the halfway point to break up the drive.
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 247.3 miles from Post Falls, ID, or about 4h 11m into the drive.
The longest continuous stretch on this route runs about 285.1 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 109 miles or 1h 51m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 247.3 miles or 4h 11m 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 247.3 miles or 4h 11m
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 10m
Traffic, exits, and arrival timing usually matter more near Shelley, ID than in the middle of the route.
Before You Leave
+
Open the route before leaving Post Falls, 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 Post Falls, ID
Aim for roughly 247 miles and 4.1 hours of wheel time on this day.
Day 2
Finish the approach into Shelley, ID
Aim for roughly 247 miles and 4.1 hours of wheel time on this day.
Your first comfortable stop window is around 109 miles from Post Falls, 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 285.1 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 286 and 494.6 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
286 mi into trip|~4h 50m in
Take the exit toward I 15 South: Dillon, Idaho Falls
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward I 15 South: Dillon, Idaho Falls
5
490.1 mi into trip|~8h 3m in|West 65th South
Enter roundabout onto West 65th South
Roundabout - know your exit number before entering
5
490.3 mi into trip|~8h 3m in|South 45th West
Enter roundabout onto South 45th West
Roundabout - know your exit number before entering
5
493.9 mi into trip|~8h 8m in|US 91 / North State Street
At end of road, turn right onto US 91 / North State Street
Navigation decision point
5
494.6 mi into trip|~8h 10m in|East Center Street
Turn sharp left onto East Center Street
Sharp turn - reduce speed on approach
Fuel & Cost
Regular Gas
$89.09 one way
$178.17 round trip
$4.58/gal25.4 MPG avg173 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.78
$93.04
$186.08
premium
$5.11
$99.43
$198.85
diesel
$6.18
$120.32
$240.64
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$89
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$219–$329
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 173.1 kg one way.
Prices: EIA weekly data, 2026-10-12.
Driving Electric?
About $52 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
148.4
1
$51.93
$23.74
Efficient EV
123.7
1
$43.28
$19.78
EV Truck/SUV
197.8
2
$69.24
$31.65
Gas CO2
173 kg
EV CO2
58 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 Oct 17, 2026
Origin
Post Falls, ID
Late night
in Post Falls on Sunday
Local time
2:10 AM
PDT
Current temp
64°F
Mostly Sunny
SW 8 to 16 mph4% chanceLive forecast
Destination
Shelley, ID
Late night
in Shelley on Sunday
Local time
3:10 AM
MDT
Current temp
64°F
Sunny
SSW 7 mph0% chanceLive forecast
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 later
The destination clock does not match departure time, so double-check hotel check-in windows and late arrival plans.
Temperature spread
Very similar conditions
Both ends of the route are sitting at about the same temperature right now.
Road read
8h 10m 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?
You'll spend 99% of your time on highways, covering 489.6 miles of interstates before reaching North 800 East. The longest continuous stretch on I 90 spans 285.1 miles. Expect a rural cruising feel for much of the trip, with fewer services and exits compared to more urban corridors. The transition to surface roads is gradual as you approach your destination.
99% highway — fuel and pacing are the main things to plan.
16 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 285.1 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. There are only a few real navigation decisions along the way. The trickiest moment comes around 286 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 10m, endurance matters. Plan breaks every 2-3 hours. The 10 decision points are all manageable with basic attention.
Where does it get tricky?
The main spots that need attention: at 286 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 490.1 miles (West 65th South): Roundabout - know your exit number before entering; at 490.3 miles (South 45th West): Roundabout - know your exit number before entering.
Elevation Profile
High-altitude sections with notable climbs
6,134 ft2,152 ft
Total Climb
5,704 ft
Total Descent
3,253 ft
Highest Point
6,134 ft
~388.6 mi in
Elevation Range
3,982 ft
Notable High Points
4,335 ft at ~70.7 miles+1,571 ft prominence
5,324 ft at ~282.6 miles+151 ft prominence
6,134 ft at ~388.6 miles+237 ft prominence
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Post Falls, ID to Shelley, ID, road signs begin pointing toward Idaho Falls along the way.
The longest stretch is about 285.1 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 247 miles on day one.
Yes — we found about 26 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 Shelley, 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 26 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: at 286 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 490.1 miles (West 65th South): Roundabout - know your exit number before entering; at 490.3 miles (South 45th West): Roundabout - know your exit number before entering.
Not recommended in a single day. At 8.2 hours each way, a round trip means 16.3 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Shelley, ID before the return drive.
