Nampa to Iona is 305.9 miles and takes about 5h 4m via Vietnam Veterans Memorial Highway and I-86, with a fuel budget near $50 and enough daylight to finish in a day. This route stays within the Mountain West region, offering a straightforward drive across Idaho. Given its manageable length and single-day feasibility, it's a good option if you're looking to get from point A to point B efficiently. The majority of the travel is on major highways, making it a relatively quick transit. Plan for a day of consistent travel, with most of your time spent on the road.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
152.9 miles from Nampa, ID
A natural place for your longest stop of the day
, about 2h 33m into the drive
.
Main Roads
Road
Distance
Duration
Vietnam Veterans Memorial Highway
183.1 mi
2h 55m
I 86
62.7 mi
59m
I 15 BUS
46.3 mi
43m
East Iona Road
4.5 mi
8m
Rigby Highway
2 mi
2m
Garrity Boulevard
1.8 mi
3m
Sunny Ridge Road
1 mi
2m
16th Avenue North
0.8 mi
1m
Longest stretch:
Vietnam Veterans Memorial Highway
— 183.1 mi, about 2h 55m
Traffic on I-84
Hour-of-day weekday pattern from 139 FHWA count stations on your route.
Peak
4 PM
~2,870 veh/hr typical
Quietest
2 AM
~184 veh/hr
Peak-to-quiet ratio
15.6×
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 Nampa, ID and Iona, ID.
1
Start on Stony Meadow Drive
183 ft·13 sec·Stony Meadow Drive
2
Turn left onto Sunny Ridge Road
1.0 mi·2 min·Sunny Ridge Road
3
Continue on Holly Street
0.3 mi·44 sec·Holly Street
4
Continue on East Bird Avenue
0.2 mi·25 sec·East Bird Avenue
5
Continue on Fern Street
0.3 mi·37 sec·Fern Street
6
Continue on East Sheridan Avenue
0.1 mi·16 sec·East Sheridan Avenue
7
Continue on Holly Street
0.3 mi·46 sec·Holly Street
8
Continue on 16th Avenue South
0.7 mi·1 min·16th Avenue South
9
Continue on 16th Avenue Overpass
0.1 mi·15 sec·16th Avenue Overpass
10
Continue on 16th Avenue North
0.8 mi·1 min·16th Avenue North
Use the right lane.
11
Turn right onto I 84 Business
1.8 mi·3 min·Garrity Boulevard
12
Take the ramp onto I 84 Business
0.4 mi·25 sec·I 84 Business
Toward I 84 East: Meridian, BoiseUse the straight / right lanes.
13
Merge onto I 84; US 30; ID 55
11 mi·12 min·Vietnam Veterans Memorial Highway
Use the straight / slight right lanes.
14
Keep slight right at fork onto I 84; US 30
172 mi·2 hr 42 min·Vietnam Veterans Memorial Highway
Use the slight right lane.
15
Continue on I 86; US 30
63 mi·59 min·I 86; US 30
16
Keep slight left at fork
0.6 mi·40 sec
Toward Idaho Falls
17
Merge onto I 15 BUS
46 mi·43 min·I 15 BUS
18
Take the exit onto US 20
0.3 mi·35 sec·US 20
Exit 119Toward US 20 East, I 15: Rigby, West Yellowstone
19
Continue on US 20
2.0 mi·2 min·Rigby Highway
Use the right lane.
20
Take the exit
0.2 mi·35 sec
Exit 310Toward US 20 Business: Lewisville, Idaho Falls
21
Turn right onto US 20 BUS
378 ft·15 sec·North 5th East
22
Turn left onto East Iona Road
2.0 mi·3 min·East Iona Road
23
Enter roundabout onto East Iona Road
110 ft·2 sec·East Iona Road
24
Continue on East Iona Road
2.0 mi·3 min·East Iona Road
25
Enter roundabout
113 ft·2 sec
26
Continue
137 ft·3 sec
27
Continue on East Iona Road
0.5 mi·1 min·East Iona Road
28
Turn left onto Olson Avenue
424 ft·18 sec·Olson Avenue
29
Arrive at destination
Olson Avenue
Trip Plan
For this 5-hour drive, leaving in the morning is advisable to maximize daylight and allow for any unforeseen delays. With a fuel cost estimated around $50, ensure your tank is full before departing Nampa, as opportunities for cheaper fuel might be limited on the road. The longest stretch without a significant change in road type is 183.1 miles, so plan to take a break before or shortly after this segment. Since it's a single-day trip, you have flexibility in pacing your stops. Keep an eye on your fuel gauge, especially as you transition off the main highways.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 152.9 miles from Nampa, ID, or about 2h 33m into the drive.
The longest continuous stretch on this route runs about 183.1 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 67 miles or 1h 12m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 152.9 miles or 2h 33m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 6m
Traffic, exits, and arrival timing usually matter more near Iona, ID than in the middle of the route.
Before You Leave
+
Open the route before leaving Nampa, 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.
Day 1
Settle into the route from Nampa, ID
This is one driving day of about 305.9 miles and 5h 4m.
Your first comfortable stop window is around 67 miles from Nampa, ID.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on Vietnam Veterans Memorial Highway for about 183.1 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 13
5 decision points cluster between mile 5.5 and 300.9 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
5.5 mi into trip|~12m in|I 84 Business
Take the ramp onto I 84 Business toward I 84 East: Meridian, Boise
Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / right lanes.
Toward I 84 East: Meridian, Boise
5
5.9 mi into trip|~12m in|I 84; US 30; ID 55 / Vietnam Veterans Memorial Highway
Merge onto I 84; US 30; ID 55 / Vietnam Veterans Memorial Highway
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
6
16.7 mi into trip|~25m in|I 84; US 30 / Vietnam Veterans Memorial Highway
Keep slight right at fork onto I 84; US 30 / Vietnam Veterans Memorial Highway
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
6
298.6 mi into trip|~4h 51m in|US 20
Take the exit onto US 20 toward US 20 East, I 15: Rigby, West Yellowstone
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 119
Toward US 20 East, I 15: Rigby, West Yellowston...
6
300.9 mi into trip|~4h 55m in
Take the exit toward US 20 Business: Lewisville, Idaho Falls
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 310
Toward US 20 Business: Lewisville, Idaho Falls
Fuel & Cost
Regular Gas
$47.68 one way
$95.36 round trip
$3.96/gal25.4 MPG avg107 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$50.26
$100.51
premium
$4.47
$53.88
$107.76
diesel
$4.80
$57.76
$115.52
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$48
Meals
$25–$50
Total
$73–$98
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 107 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $32 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
91.8
1
$32.12
$14.68
Efficient EV
76.5
0
$26.77
$12.24
EV Truck/SUV
122.4
1
$42.83
$19.58
Gas CO2
107 kg
EV CO2
36 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 17, 2026
Origin
Nampa, ID
Evening
in Nampa on Saturday
Local time
8:34 PM
MDT
Current temp
98°F
Sunny
WNW 6 mph2% chanceLive forecast
Flash Flood Watch
Flash Flood Watch issued July 17 at 1:18PM MDT until July 17 at 9:00PM MDT by NWS Boise ID
Special Weather Statement
Special Weather Statement issued July 17 at 1:10PM MDT by NWS Pocatello ID
Destination
Iona, ID
Evening
in Iona on Saturday
Local time
8:34 PM
MDT
Current temp
89°F
Chance Showers And Thunderstorms
SSE 8 mph43% chanceLive forecast
Flash Flood Watch
Flash Flood Watch issued July 17 at 1:18PM MDT until July 17 at 9:00PM MDT by NWS Boise ID
Special Weather Statement
Special Weather Statement issued July 17 at 1:10PM 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.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
9 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
5h 4m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Hagerman Fossil Beds National Monument
National Monument
During the Pliocene, this place looked quite different. Lush wetlands, forests, and grasslands provided excellent habitat for a variety of animals. From fascinating, now-extinct creatures like the sab...
7 mi from route
~18 min detour
Free
near mile 116
Caution: Use Caution with "Fossil Beds Information" Signs
Caution: If You Can't Reach Us By Phone, Please Email Us
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
About 36% of this 305.9-mile drive is on highways, with the longest stretch of highway cruising at 183.1 miles on Vietnam Veterans Memorial Highway. After this significant highway portion, you'll transition to surface roads for the remainder of the trip. Expect a mix of driving experiences, from higher-speed highway travel to potentially slower speeds and more frequent intersections as you approach your destination. You'll notice the change in road type as the landscape opens up for rural cruising.
36% highway, the rest on surface roads — varied driving throughout.
29 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 183.1 mi on Vietnam Veterans Memorial Highway.
How Hard Is This Drive?
6/10
This route mixes highway mileage with some local-road sections near the start or finish. You will hit about 13 points where you need to pay attention to lane position or signs. The trickiest moment comes around 5.5 miles in near I 84 Business.
Driving Effort6/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 305.9 miles you will encounter 13 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 5.5 miles (I 84 Business): Lane positioning matters here. Multiple destination signs - pick the right one; at 5.9 miles (I 84; US 30; ID 55 / Vietnam Veterans Memorial Highway): Merge point - match speed before joining. Lane positioning matters here; at 16.7 miles (I 84; US 30 / Vietnam Veterans Memorial Highway): Highway fork - watch signs carefully. Lane positioning matters here.
Elevation Profile
Hilly terrain with moderate elevation changes
4,784 ft2,520 ft
Total Climb
3,047 ft
Total Descent
783 ft
Highest Point
4,784 ft
~305.9 mi in
Elevation Range
2,264 ft
Notable High Points
4,421 ft at ~196.6 miles+127 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 Nampa, ID to Iona, ID, road signs begin pointing toward Idaho Falls along the way.
Idaho Falls
251.7 mi in|~4h 7m
Detours Along the Way
Tagged by where each one fits in your drive — first break, midpoint, final stretch.
Doable as a same-day drive at 5h 4m. Total distance: 305.9 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
5h 4m drive, comfortable solo distance.
Scenic Drive
Mixed highway & surface route profile with national parks nearby.
Frequently Asked Questions
The longest stretch is about 183.1 miles on Vietnam Veterans Memorial Highway. The full list of main roads is in the Roads section above.
Yes — we found about 20 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 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 Iona, 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 1 meaningful breaks. There are 20 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 5.5 miles (I 84 Business): Lane positioning matters here. Multiple destination signs - pick the right one; at 5.9 miles (I 84; US 30; ID 55 / Vietnam Veterans Memorial Highway): Merge point - match speed before joining. Lane positioning matters here; at 16.7 miles (I 84; US 30 / Vietnam Veterans Memorial Highway): Highway fork - watch signs carefully. Lane positioning matters here.
Yes — Hagerman Fossil Beds National Monument. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 5.1 hours each way, a round trip means 10.2 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Iona, ID before the return drive.
