This 240.7-mile drive from Ammon, ID, to Mountain Home, ID, is a manageable one-day trip, taking approximately 3 hours and 52 minutes. You'll primarily travel on Vietnam Veterans Memorial Highway and I-86, with about 26% of the journey on highways. Budget around $38 for fuel for this relatively straightforward excursion through the Mountain West region. With only one recommended stop, this route offers a direct path between these two Idaho locations, making it a practical choice for getting from point A to point B efficiently.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Break Rhythm
1 planned break
A short stop every 2 to 3 hours is enough for this drive.
Midpoint
120.4 miles from Ammon, ID
A natural place for your longest stop of the day
, about 1h 58m into the drive
.
Main Roads
Road
Distance
Duration
Vietnam Veterans Memorial Highway
125.8 mi
1h 57m
I 86
62.7 mi
59m
Veterans Memorial Highway
43.1 mi
40m
East Sunnyside Road
6.1 mi
9m
Idaho Medal of Honor Highway
1.5 mi
2m
I 84 Business
0.4 mi
<1m
I 15 BUS
0.2 mi
<1m
Central Avenue
0.1 mi
<1m
Longest stretch:
Vietnam Veterans Memorial Highway
— 125.8 mi, about 1h 57m
Traffic on I-84
Hour-of-day weekday pattern from 32 FHWA count stations on your route.
Peak
4 PM
~847 veh/hr typical
· worst 1,091
Quietest
2 AM
~92 veh/hr
Peak-to-quiet ratio
9.2×
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 Ammon, ID and Mountain Home, ID.
1
Start on Molen Street
135 ft·11 sec·Molen Street
2
Turn left onto Central Avenue
0.1 mi·35 sec·Central Avenue
3
Turn right onto East Sunnyside Road
6.1 mi·9 min·East Sunnyside Road
4
Take the exit onto I 15 BUS; US 26
0.2 mi·31 sec·I 15 BUS; US 26
Toward Blackfook, Pocatello, Salt Lake City
5
Merge onto I 15; US 26
43 mi·40 min·Veterans Memorial Highway
6
Take the exit
0.6 mi·43 sec
Exit 72Toward I 86 West: Chubbuck, Twin Falls
7
Continue on I 86
63 mi·59 min·I 86
8
Continue on I 84; US 30
126 mi·1 hr 57 min·Vietnam Veterans Memorial Highway
9
Take the exit onto I 84 Business
0.4 mi·55 sec·I 84 Business
Exit 95Toward US 20 East, I 84 Business: Mountain Home, Fairfield
10
Turn left onto I 84 Business; US 20
201 ft·3 sec·Sun Valley Highway
11
Continue on I 84 Business; US 20
1.5 mi·2 min·Idaho Medal of Honor Highway
Use the straight lane.
12
Turn slight left onto East 2nd North Street
0.1 mi·26 sec·East 2nd North Street
13
Arrive at destination
East 2nd North Street
Trip Plan
Given the 3-hour and 52-minute duration for 240.7 miles, this trip is easily completed in a single day. You can depart Ammon, ID, at your leisure, as the relatively short travel time allows for flexibility. Plan for one stop to break up the drive, perhaps around the halfway point or where convenient. Keep an eye on your fuel gauge, especially before departing on the 125.8-mile stretch of Vietnam Veterans Memorial Highway, to ensure you have enough to reach your destination in Mountain Home, ID, without needing to search for services.
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 120.4 miles from Ammon, ID, or about 1h 58m into the drive.
The longest continuous stretch on this route runs about 125.8 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 53 miles or 54m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 120.4 miles or 1h 58m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 10m
Traffic, exits, and arrival timing usually matter more near Mountain Home, ID than in the middle of the route.
Before You Leave
+
Open the route before leaving Ammon, 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 Ammon, ID
This is one driving day of about 240.7 miles and 3h 52m.
Your first comfortable stop window is around 53 miles from Ammon, 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 125.8 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 7
5 decision points cluster between mile 0 and 238.7 — 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|Central Avenue
Turn left onto Central Avenue
Navigation decision point
4
0.2 mi into trip|~0m in|East Sunnyside Road
Turn right onto East Sunnyside Road
Navigation decision point
6
6.2 mi into trip|~9m in|I 15 BUS; US 26
Take the exit onto I 15 BUS; US 26 toward Blackfook, Pocatello, Salt Lake City
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward Blackfook, Pocatello, Salt Lake City
6
49.5 mi into trip|~51m in
Take the exit toward I 86 West: Chubbuck, Twin Falls
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 72
Toward I 86 West: Chubbuck, Twin Falls
6
238.7 mi into trip|~3h 49m in|I 84 Business
Take the exit onto I 84 Business toward US 20 East, I 84 Business: Mountain Home, Fairfield
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 95
Toward US 20 East, I 84 Business: Mountain Home...
Fuel & Cost
Regular Gas
$37.52 one way
$75.03 round trip
$3.96/gal25.4 MPG avg84 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$39.54
$79.09
premium
$4.47
$42.40
$84.79
diesel
$4.80
$45.45
$90.90
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$38
Meals
$25–$50
Total
$63–$88
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 84.2 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $25 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
72.2
0
$25.27
$11.55
Efficient EV
60.2
0
$21.06
$9.63
EV Truck/SUV
96.3
1
$33.70
$15.40
Gas CO2
84 kg
EV CO2
28 kg (67% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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 18, 2026
Origin
Ammon, ID
Late night
in Ammon on Sunday
Local time
1:05 AM
MDT
Current temp
91°F
Sunny
NNW 1 to 5 mph2% chanceLive forecast
Destination
Mountain Home, ID
Late night
in Mountain Home on Sunday
Local time
1:05 AM
MDT
Current temp
102°F
Patchy Smoke
SW 3 to 9 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.
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
11 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
3h 52m on the road
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
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...
8 mi from route
~19 min detour
Free
near mile 190.9
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?
Expect a 'turn-heavy local drive' profile for this 240.7-mile journey. While 26% of your travel will be on highways, much of the route involves navigating local roads, indicated by its 'turn-heavy' characteristic. The longest uninterrupted stretch you'll encounter is 125.8 miles on Vietnam Veterans Memorial Highway. This suggests a driving experience that might involve more frequent adjustments and varied scenery compared to a pure interstate cruise, offering a dynamic feel as you progress.
Only 26% highway — the rest is turn-by-turn surface driving.
13 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 125.8 mi on Vietnam Veterans Memorial Highway.
How Hard Is This Drive?
3/10
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near Central Avenue.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 3h 52m drive. You will face about 7 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: near the start (Central Avenue): Navigation decision point; at 0.2 miles (East Sunnyside Road): Navigation decision point; at 6.2 miles (I 15 BUS; US 26): Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Elevation Profile
Gently rolling terrain
4,717 ft2,549 ft
Total Climb
790 ft
Total Descent
2,363 ft
Highest Point
4,717 ft
Elevation Range
2,168 ft
Notable High Points
4,490 ft at ~51.6 miles+13 ft prominence
4,359 ft at ~103.2 miles+134 ft prominence
4,209 ft at ~137.5 miles+49 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 Ammon, ID to Mountain Home, ID, road signs begin pointing toward Twin Falls along the way.
Mostly surface roads route profile with national parks nearby.
Frequently Asked Questions
The longest stretch is about 125.8 miles on Vietnam Veterans Memorial Highway. The full list of main roads is in the Roads section above.
Yes — we found about 13 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.
Yes, with realistic expectations. Build in a stop roughly every 2 hours, have snacks and activities ready, and check the Nearby Places tabs for kid-friendly stops along the way.
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 (Central Avenue): Navigation decision point; at 0.2 miles (East Sunnyside Road): Navigation decision point; at 6.2 miles (I 15 BUS; US 26): Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Yes — Hagerman Fossil Beds National Monument. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 3.9 hours each way, an in-and-out day trip would put you behind the wheel for 7.8 hours — manageable with a long break at Mountain Home, ID, but most travelers stay overnight.
