Tyhee, ID to Post Falls, ID is 533.2 miles and takes about 8h 47m via I 90, Veterans Memorial Highway, and New Day Parkway, with a fuel budget near $90 and enough daylight to finish in a day. This long-haul drive stays within the Mountain West region, making for a straightforward trip across Idaho. Given the duration, it's best suited for an overnight stay, splitting the drive into two manageable days. Plan for a day of consistent travel, covering a significant distance with minimal detours.
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
266.6 miles from Tyhee, ID
A natural place for your longest stop of the day
, about 4h 15m into the drive
.
Main Roads
Road
Distance
Duration
I 90
285.8 mi
4h 49m
Veterans Memorial Highway
243.1 mi
3h 48m
New Day Parkway
1.5 mi
2m
North Yellowstone Highway
0.6 mi
<1m
Yellowstone Avenue
0.5 mi
<1m
North Spokane Street
0.3 mi
1m
West 10th Avenue
0.2 mi
<1m
Cherry Lane
<0.1 mi
<1m
Longest stretch:
I 90
— 285.8 mi, about 4h 49m
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 Tyhee, ID and Post Falls, ID.
1
Start on Cherry Lane
50 ft·7 sec·Cherry Lane
2
Turn left onto US 91
0.6 mi·56 sec·North Yellowstone Highway
3
Continue on US 91
0.5 mi·52 sec·Yellowstone Avenue
4
Turn left onto New Day Parkway
1.5 mi·2 min·New Day Parkway
Use the straight lane.
5
Turn left
0.3 mi·43 sec
Use the left lane.
6
Merge onto I 15
243 mi·3 hr 48 min·Veterans Memorial Highway
7
Take the exit
0.5 mi·1 min
Toward I 90 West: Missoula
8
Merge onto I 90
286 mi·4 hr 49 min·I 90
Toward I 90 West: Missoula
9
Take the exit
0.4 mi·50 sec
Toward Spokane Street
10
Turn right onto I 90 Bus
0.3 mi·1 min·North Spokane Street
11
Turn left onto West 10th Avenue
0.2 mi·38 sec·West 10th Avenue
12
Arrive at destination
West 10th Avenue
Trip Plan
For this 8h 47m drive, consider splitting it into two days to avoid fatigue, with an overnight stop around the halfway point. Leaving early in the morning on your first day will allow you to cover a good portion of the route, perhaps reaching the area around the 285.8-mile mark on I 90 before stopping for the night. Keep an eye on fuel levels, especially during the longer highway stretches, and utilize the designated 2 stops for breaks. The $90 fuel cost is an estimate, so checking local prices is advisable.
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 266.6 miles from Tyhee, ID, or about 4h 15m 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 52m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 266.6 miles or 4h 15m 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 266.6 miles or 4h 15m
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 44m
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 Tyhee, 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 Tyhee, 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 Tyhee, 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 9
5 decision points cluster between mile 1.2 and 532.3 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
1.2 mi into trip|~1m in|New Day Parkway
Turn left onto New Day Parkway
Lane positioning matters here
Use the straight lane.
5
2.6 mi into trip|~4m in
Turn left
Lane positioning matters here
Use the left lane.
4
246 mi into trip|~3h 53m in
Take the exit toward I 90 West: Missoula
Exit ramp - move to the correct lane early
Toward I 90 West: Missoula
4
246.6 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
532.3 mi into trip|~8h 44m in
Take the exit toward Spokane Street
Exit ramp - move to the correct lane early
Toward Spokane Street
Fuel & Cost
Regular Gas
$92.47 one way
$184.94 round trip
$4.41/gal25.4 MPG avg187 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.61
$96.71
$193.42
premium
$4.95
$103.91
$207.82
diesel
$5.60
$117.53
$235.07
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$92
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$222–$332
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 186.6 kg one way.
Prices: EIA weekly data, 2026-08-31.
Driving Electric?
About $56 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
160
1
$55.99
$25.59
Efficient EV
133.3
1
$46.66
$21.33
EV Truck/SUV
213.3
2
$74.65
$34.12
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 Aug 17, 2026
Origin
Tyhee, ID
Evening
in Tyhee on Tuesday
Local time
8:59 PM
MDT
Current temp
54°F
Partly Cloudy
E 2 mph0% chanceLive forecast
Destination
Post Falls, ID
Evening
in Post Falls on Tuesday
Local time
7:59 PM
PDT
Current temp
59°F
Mostly Cloudy
SE 1 mph1% 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 earlier
The destination clock does not match departure time, so double-check hotel check-in windows and late arrival plans.
Temperature spread
5 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 47m 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 54% highway, with the longest stretch of continuous highway travel being 285.8 miles on I 90. You'll experience significant highway cruising before transitioning to surface roads. Expect a substantial portion of your drive to be on major freeways, with fewer exits and more open road for extended periods. The latter part of the drive involves Veterans Memorial Highway and New Day Parkway, indicating a shift to more developed, potentially more exit-dense, areas as you approach your destination.
54% highway, the rest on surface roads — varied driving throughout.
12 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 47m, 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 around 1.2 miles in near New Day Parkway.
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 47m, endurance matters. Plan breaks every 2-3 hours. The 9 decision points are all manageable with basic attention.
Where does it get tricky?
The main spots that need attention: at 1.2 miles (New Day Parkway): Lane positioning matters here; at 2.6 miles: Lane positioning matters here; at 246 miles: Exit ramp - move to the correct lane early.
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 1.2 miles (New Day Parkway): Lane positioning matters here; at 2.6 miles: Lane positioning matters here; at 246 miles: Exit ramp - move to the correct lane early.
Not recommended in a single day. At 8.8 hours each way, a round trip means 17.6 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.
