Traveling from Post Falls to Boise covers 445.5 miles and typically takes about 8 hours and 12 minutes of pure driving time. Because of the duration, this trip is best approached as a two-day journey rather than a single grueling day behind the wheel. You will primarily navigate via the Old Oregon Trail Highway, the Thomas S. Foley Memorial Highway, and I-90. Budgeting roughly $71 for fuel is a solid baseline for your planning. Since both cities are located within the Mountain West, you will stay within the same regional climate, though the landscape shifts as you move 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
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
222.8 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
Old Oregon Trail Highway
215.2 mi
3h 48m
Thomas S. Foley Memorial Highway
73.7 mi
1h 19m
I 90
56.6 mi
1h
I 90 Bus
26.2 mi
31m
Lewis and Clark Trail Highway
23.7 mi
26m
Vietnam Veterans Memorial Highway
21.7 mi
25m
Umatilla-Stanfield Highway
8.4 mi
9m
Lewis and Clark Trail
5.7 mi
7m
Longest stretch:
Old Oregon Trail Highway
— 215.2 mi, about 3h 48m
Turn-by-Turn Driving Directions
Step-by-step road directions between Post Falls, ID and Boise, ID.
1
Start on West 10th Avenue
0.2 mi·40 sec·West 10th Avenue
2
Turn right onto North Spokane Street
0.3 mi·59 sec·North Spokane Street
3
Take the ramp onto I 90 Bus
26 mi·31 min·I 90 Bus
4
Keep slight left at fork onto I 90; US 395
57 mi·1 hr·I 90; US 395
5
Keep slight right at fork onto US 395
74 mi·1 hr 19 min·Thomas S. Foley Memorial Highway
Toward Ritzville, Pasco
6
Take the exit onto US 395
0.6 mi·1 min·US 395
Toward I 182 West, US 395 South: Richland, Pendleton
7
Merge onto I 182; US 12; US 395
1.9 mi·2 min·Lewis and Clark Trail
8
Keep slight right at fork onto US 395
3.8 mi·5 min·Lewis and Clark Trail
Toward US 395: Kennewick, Pendleton, Columbia Basin College, Tri Cities Airport
9
Continue on US 395
1.1 mi·2 min·North US 395
10
Continue on US 395
24 mi·26 min·Lewis and Clark Trail Highway
11
Take the exit onto US 395
0.2 mi·22 sec·US 395
Toward US 395 south, US 730: Umatilla, Hermiston, Irrigon
12
Keep slight left at fork onto US 395
171 ft·10 sec·US 395
Toward US 395 south, US 730: Umatilla, Hermiston, Irrigon
13
Turn left onto US 395; US 730
0.8 mi·57 sec·Columbia River Highway
14
Turn right onto US 395
3.8 mi·4 min·Umatilla-Stanfield Highway
15
Continue on US 395
0.5 mi·44 sec·North 1st Street
16
Turn left onto East Theater Lane
0.3 mi·40 sec·East Theater Lane
17
Turn right onto Northeast 4th Street
1.6 mi·2 min·Northeast 4th Street
18
Turn left onto US 395
3.2 mi·3 min·Umatilla-Stanfield Highway
19
Continue on US 395
2.0 mi·2 min·North Main Street
20
Continue on US 395
1.4 mi·1 min·Umatilla-Stanfield Highway
21
Take the exit onto US 395
0.5 mi·1 min·US 395
Toward US 395 North: Stanfield
22
Merge onto I 84; US 30; US 395
215 mi·3 hr 48 min·Old Oregon Trail Highway
Use the straight / slight right lanes.
23
Continue on I 84; US 20; US 26; US 30
0.7 mi·47 sec·Idaho Medal of Honor Highway
24
Continue on I 84; US 20; US 26; US 30
22 mi·25 min·Vietnam Veterans Memorial Highway
Use the straight / slight right lanes.
25
Keep slight left at fork onto I 184
4.7 mi·6 min·Boise Connector
Exit 49Use the straight / slight right lanes.
26
Continue on US 20; US 26
0.6 mi·1 min·West Myrtle Street
Use the straight / left lanes.
27
Turn left onto South 5th Street
0.1 mi·26 sec·South 5th Street
28
Turn left onto US 20; US 26
0.1 mi·19 sec·West Front Street
29
Turn right
55 ft·4 sec
30
Arrive at destination
Trip Plan
Planning for two days of travel is the best way to manage this 445.5-mile route comfortably. With two suggested stops along the way, you can easily break up the drive to avoid fatigue. Since a large portion of the trip involves local roads rather than high-speed interstates, keep an eye on your pace, as the turns will likely slow your progress more than you might expect. Prioritize refueling before hitting the longer, more remote stretches of the Old Oregon Trail Highway to ensure you don't get caught low on gas. Leaving early in the morning allows you to tackle the more technical, turn-heavy sections in daylight when visibility is at its best.
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 222.8 miles from Post Falls, ID, or about 4h 11m into the drive.
The longest continuous stretch on this route runs about 215.2 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 98 miles or 1h 49m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 222.8 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 222.8 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 4m
Traffic, exits, and arrival timing usually matter more near Boise, 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 223 miles and 4.1 hours of wheel time on this day.
Day 2
Finish the approach into Boise, ID
Aim for roughly 223 miles and 4.1 hours of wheel time on this day.
Your first comfortable stop window is around 98 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 Old Oregon Trail Highway for about 215.2 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 20
5 decision points cluster between mile 83.3 and 439.9 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
83.3 mi into trip|~1h 33m in|US 395 / Thomas S. Foley Memorial Highway
Keep slight right at fork onto US 395 / Thomas S. Foley Memorial Highway toward Ritzville, Pasco
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward Ritzville, Pasco
5
157 mi into trip|~2h 53m in|US 395
Take the exit onto US 395 toward I 182 West, US 395 South: Richland, Pendleton
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward I 182 West, US 395 South: Richland, Pend...
6
159.4 mi into trip|~2h 56m in|US 395 / Lewis and Clark Trail
Keep slight right at fork onto US 395 / Lewis and Clark Trail toward US 395: Kennewick, Pendleton, Columbia Basin College, Tri Cities Airport
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward US 395: Kennewick, Pendleton, Columbia B...
7
188.2 mi into trip|~3h 31m in|US 395
Keep slight left at fork onto US 395 toward US 395 south, US 730: Umatilla, Hermiston, Irrigon
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward US 395 south, US 730: Umatilla, Hermisto...
7
439.9 mi into trip|~8h 3m in|I 184 / Boise Connector
Keep slight left at fork onto I 184 / Boise Connector
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Exit 49
Fuel & Cost
Regular Gas
$70.60 one way
$141.19 round trip
$4.03/gal25.4 MPG avg156 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.22
$74.00
$148.00
premium
$4.53
$79.47
$158.94
diesel
$5.61
$98.36
$196.72
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$71
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$201–$311
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 155.9 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $47 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
133.7
1
$46.78
$21.38
Efficient EV
111.4
1
$38.98
$17.82
EV Truck/SUV
178.2
2
$62.37
$28.51
Gas CO2
156 kg
EV CO2
52 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 Apr 15, 2026
Origin
Post Falls, ID
Evening
in Post Falls on Saturday
Local time
6:08 PM
PDT
Current temp
45°F
Unavailable
Live forecast
Destination
Boise, ID
Evening
in Boise on Saturday
Local time
7:08 PM
MDT
Current temp
62°F
Unavailable
Live 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
17 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 12m 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?
Expect a varied experience that transitions from fast interstate travel to turn-heavy local stretches. Only 19% of your total mileage is on major highways, meaning you will spend significant time navigating local roads that demand more focus than a standard freeway cruise. The longest uninterrupted portion of your trip is a 215.2-mile stretch along the Old Oregon Trail Highway, which serves as the backbone of your journey. Be prepared for the road’s personality to shift as you move away from the interstate, as the route requires more active steering and attention than a straight-line highway grind.
Only 19% highway — the rest is turn-by-turn surface driving.
30 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 215.2 mi on Old Oregon Trail Highway.
How Hard Is This Drive?
8/10
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 83.3 miles in near US 395 / Thomas S. Foley Memorial Highway.
Driving Effort8/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 20 significant decision points across 445.5 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 83.3 miles (US 395 / Thomas S. Foley Memorial Highway): Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 157 miles (US 395): Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 159.4 miles (US 395 / Lewis and Clark Trail): Highway fork - watch signs carefully. Multiple destination signs - pick the right one.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Post Falls, ID and Boise, ID, road signs point toward Ritzville, Pasco, Pendleton, Columbia Basin College, Tri Cities Airport and Hermiston - among others.
Boise is the capital and largest city of Idaho. Boise offers numerous recreational opportunities, including extensive hiking and biking in the foothills to the immediate north of downtown. Boise is a regional hub for jazz, theater, and indie music, and is home to several museums.
The longest stretch is about 215.2 miles on Old Oregon Trail Highway. 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 223 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 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 Boise, 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 83.3 miles (US 395 / Thomas S. Foley Memorial Highway): Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 157 miles (US 395): Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 159.4 miles (US 395 / Lewis and Clark Trail): Highway fork - watch signs carefully. Multiple destination signs - pick the right one.
Not recommended in a single day. At 8.2 hours each way, a round trip means 16.4 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Boise, ID before the return drive.
