Garden City to Ammon is 285.3 miles and takes about 4h 39m via Vietnam Veterans Memorial Highway, I 86, and I 15 BUS, with a fuel budget near $44 and enough daylight to finish in a day. This drive stays within Idaho, moving from the Mountain West region to the Mountain West region. You'll encounter a mix of highway and surface roads, making for a varied, but generally straightforward, trip. With just one recommended stop and a manageable duration, this is a solid option for a single-day excursion.
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
142.6 miles from Garden City, ID
A natural place for your longest stop of the day
, about 2h 20m into the drive
.
Main Roads
Road
Distance
Duration
Vietnam Veterans Memorial Highway
166.5 mi
2h 36m
I 86
62.7 mi
59m
I 15 BUS
43.5 mi
41m
West Sunnyside Road
5.9 mi
9m
South Federal Way
2.1 mi
3m
Boise Connector
0.9 mi
1m
South 9th Street
0.5 mi
1m
South Capitol Boulevard
0.4 mi
<1m
Longest stretch:
Vietnam Veterans Memorial Highway
— 166.5 mi, about 2h 36m
Traffic on I-84
Hour-of-day weekday pattern from 124 FHWA count stations on your route.
Peak
4 PM
~1,321 veh/hr typical
· worst 1,691
Quietest
2 AM
~119 veh/hr
Peak-to-quiet ratio
11.1×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 104 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 Garden City, ID and Ammon, ID.
1
Start on East 33rd Street
64 ft·7 sec·East 33rd Street
2
Turn left onto US 20; US 26
0.4 mi·50 sec·West Chinden Boulevard
3
Take the ramp onto US 20; US 26
0.2 mi·26 sec·US 20; US 26
Toward US 20 East, US 26
4
Merge onto US 20; US 26
0.9 mi·1 min·Boise Connector
Use the straight / slight right lanes.
5
Continue on US 20; US 26
0.3 mi·44 sec·West Myrtle Street
6
Turn right onto South 9th Street
0.5 mi·1 min·South 9th Street
7
Continue on South Capitol Boulevard
0.4 mi·50 sec·South Capitol Boulevard
8
Keep slight left at fork onto South Capitol Boulevard
183 ft·5 sec·South Capitol Boulevard
9
Continue on South Federal Way
2.1 mi·3 min·South Federal Way
10
Turn right
0.3 mi·57 sec
11
Turn straight onto US 20; US 26
0.4 mi·46 sec·South Broadway Avenue
12
Take the ramp onto US 20; US 26
0.4 mi·46 sec·Idaho Medal of Honor Highway
Toward I 84 EastUse the left lane.
13
Continue on I 84; US 20; US 26; US 30
166 mi·2 hr 36 min·Vietnam Veterans Memorial Highway
Use the straight / slight right lanes.
14
Continue on I 86; US 30
63 mi·59 min·I 86; US 30
15
Keep slight left at fork
0.6 mi·40 sec
Toward Idaho Falls
16
Merge onto I 15 BUS
43 mi·40 min·I 15 BUS
17
Take the exit onto I 15 BUS; US 26
0.3 mi·35 sec·I 15 BUS; US 26
Toward I 15 Business, US 26: Ammon, Jackson
18
Turn right onto I 15 BUS; US 26
5.9 mi·9 min·West Sunnyside Road
19
Turn left onto Central Avenue
0.1 mi·35 sec·Central Avenue
20
Turn right onto Molen Street
135 ft·6 sec·Molen Street
21
Arrive at destination
Molen Street
Trip Plan
Consider an early morning departure from Garden City to maximize daylight and take advantage of the 1-day travel time. With a duration under five hours, you can likely complete this trip without needing to split it, offering flexibility for your departure. Keep an eye on your fuel gauge, especially during the longer highway stretches; the estimated fuel cost is $44. Given the mixed highway and surface road profile, be prepared for varying speed limits and road conditions as you get closer to Ammon.
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 142.6 miles from Garden City, ID, or about 2h 20m into the drive.
The longest continuous stretch on this route runs about 166.5 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 63 miles or 1h 5m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 142.6 miles or 2h 20m 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 46m
Traffic, exits, and arrival timing usually matter more near Ammon, ID than in the middle of the route.
Before You Leave
+
Open the route before leaving Garden City, 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 Garden City, ID
This is one driving day of about 285.3 miles and 4h 39m.
Your first comfortable stop window is around 63 miles from Garden City, 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 166.5 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 0.6 and 285.2 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0.6 mi into trip|~1m in|US 20; US 26 / Boise Connector
Merge onto US 20; US 26 / Boise Connector
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
6
5.5 mi into trip|~11m in|US 20; US 26 / Idaho Medal of Honor Highway
Take the ramp onto US 20; US 26 / Idaho Medal of Honor Highway toward I 84 East
Lane positioning matters here
Use the left lane.
Toward I 84 East
5
235.1 mi into trip|~3h 47m in
Keep slight left at fork toward Idaho Falls
Highway fork - watch signs carefully
Toward Idaho Falls
5
278.9 mi into trip|~4h 28m in|I 15 BUS; US 26
Take the exit onto I 15 BUS; US 26 toward I 15 Business, US 26: Ammon, Jackson
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward I 15 Business, US 26: Ammon, Jackson
5
285.2 mi into trip|~4h 39m in|Molen Street
Turn right onto Molen Street
Navigation decision point
Fuel & Cost
Regular Gas
$51.72 one way
$103.45 round trip
$4.61/gal25.4 MPG avg100 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.82
$54.18
$108.37
premium
$5.13
$57.60
$115.20
diesel
$6.28
$70.49
$140.99
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$52
Meals
$25–$50
Total
$77–$102
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 99.8 kg one way.
Prices: EIA weekly data, 2026-10-19.
Driving Electric?
About $30 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
85.6
1
$29.96
$13.69
Efficient EV
71.3
0
$24.96
$11.41
EV Truck/SUV
114.1
1
$39.94
$18.26
Gas CO2
100 kg
EV CO2
33 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 Oct 19, 2026
Origin
Garden City, ID
Night
in Garden City on Saturday
Local time
9:44 PM
MDT
Current temp
48°F
Mostly Clear
ESE 6 mph0% chanceLive forecast
Destination
Ammon, ID
Night
in Ammon on Saturday
Local time
9:44 PM
MDT
Current temp
37°F
Clear
E 3 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.
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 cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
4h 39m 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
~17 min detour
Free
near mile 98.4
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route includes 37% highway driving, with the longest continuous stretch on Vietnam Veterans Memorial Highway covering 166.5 miles. You'll transition from highway cruising to surface roads during your drive. Expect a mix of driving conditions, from high-speed highway segments to potentially slower surface road travel as you approach your destination.
37% highway, the rest on surface roads — varied driving throughout.
21 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 166.5 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 0.6 miles in near US 20; US 26 / Boise Connector.
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 285.3 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 0.6 miles (US 20; US 26 / Boise Connector): Merge point - match speed before joining. Lane positioning matters here; at 5.5 miles (US 20; US 26 / Idaho Medal of Honor Highway): Lane positioning matters here; at 235.1 miles: Highway fork - watch signs carefully.
Elevation Profile
Gently rolling terrain
4,717 ft2,574 ft
Total Climb
2,875 ft
Total Descent
825 ft
Highest Point
4,717 ft
~267.6 mi in
Elevation Range
2,143 ft
Notable High Points
4,165 ft at ~133.8 miles+11 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 Garden City, ID to Ammon, ID, road signs begin pointing toward Idaho Falls along the way.
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.
Doable as a same-day drive at 4h 39m. Total distance: 285.3 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
4h 39m drive, comfortable solo distance.
Scenic Drive
Mixed highway & surface route profile with national parks nearby.
Frequently Asked Questions
The longest stretch is about 166.5 miles on Vietnam Veterans Memorial Highway. The full list of main roads is in the Roads section above.
Yes — we found about 19 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 Ammon, 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 19 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 0.6 miles (US 20; US 26 / Boise Connector): Merge point - match speed before joining. Lane positioning matters here; at 5.5 miles (US 20; US 26 / Idaho Medal of Honor Highway): Lane positioning matters here; at 235.1 miles: Highway fork - watch signs carefully.
Yes — Hagerman Fossil Beds National Monument. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 4.7 hours each way, an in-and-out day trip would put you behind the wheel for 9.3 hours — manageable with a long break at Ammon, ID, but most travelers stay overnight.
