Helena to Crow Agency is 298.4 miles and takes about 5h 9m via I 90, US 12, and US 287, with a fuel budget near $47 and enough daylight to finish in a day. This drive keeps you within Montana, moving from the Mountain West region to another part of the same region. It's a straightforward, highway-focused journey that makes for a solid single-day trip. Consider this route if you're looking for an efficient way to cover ground across the state without complex navigation.
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
149.2 miles from Helena, MT
A natural place for your longest stop of the day
, about 2h 41m into the drive
.
Main Roads
Road
Distance
Duration
I 90
233.3 mi
3h 51m
US 12
34.1 mi
40m
US 287
27.6 mi
29m
11th Avenue
1.4 mi
3m
Prospect Avenue
1.3 mi
2m
Cruse Avenue
<0.1 mi
<1m
Makawasha Avenue
—
—
Some road-level metrics are being recalculated.
Longest stretch:
I 90
— 233.3 mi, about 3h 51m
Traffic on I-90
Hour-of-day weekday pattern from 24 FHWA count stations on your route.
Peak
4 PM
~777 veh/hr typical
· worst 969
Quietest
2 AM
~44 veh/hr
Peak-to-quiet ratio
17.7×
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 Helena, MT and Crow Agency, MT.
1
Start on I 15 Business
163 ft·8 sec·Cruse Avenue
2
Turn left onto I 15 Business
1.4 mi·3 min·11th Avenue
Use the straight / left / right lanes.
3
Turn straight onto I 15 Business; US 12
1.3 mi·2 min·Prospect Avenue
4
Continue on US 12; US 287
3.6 mi·5 min·US 12; US 287
5
Continue on US 12; US 287
0.3 mi·26 sec·US 12; US 287
6
Continue on US 12; US 287
30 mi·34 min·US 12; US 287
Use the straight lane.
7
Continue on US 287
2.3 mi·2 min·US 287
Use the straight lane.
8
Continue on US 287
1.2 mi·1 min·US 287
Use the straight lane.
9
Continue on US 287
1.4 mi·1 min·US 287
Use the straight lane.
10
Continue on US 287
23 mi·24 min·US 287
Use the straight lane.
11
Take the exit
0.3 mi·33 sec
Toward I 90 East: Billings
12
Merge onto I 90
181 mi·3 hr 2 min·I 90
13
Keep slight right at fork onto I 90; US 87; US 212
52 mi·49 min·I 90; US 87; US 212
Toward I 90 East: Sheridan
14
Take the exit
0.3 mi·46 sec
Toward Crow Agency, Baaxuwuaashe
15
Turn left
0.1 mi·18 sec
16
Arrive at destination
Makawasha Avenue
Trip Plan
Given the 5-hour duration, you can comfortably complete this drive in a single day. Aim for an early morning departure from Helena to maximize daylight and allow for a relaxed pace. While the longest stretch on I 90 is over 233 miles, plan for at least one stop to refuel and stretch your legs. Keep an eye on your fuel gauge, especially as you approach Crow Agency, to ensure you have enough for the final leg.
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 149.2 miles from Helena, MT, or about 2h 41m into the drive.
The longest continuous stretch on this route runs about 233.3 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 66 miles or 1h 18m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 149.2 miles or 2h 41m 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 18m
Traffic, exits, and arrival timing usually matter more near Crow Agency, MT than in the middle of the route.
Before You Leave
+
Open the route before leaving Helena, MT 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 Helena, MT
This is one driving day of about 298.4 miles and 5h 9m.
Your first comfortable stop window is around 66 miles from Helena, MT.
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 I 90 for about 233.3 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 6
5 decision points cluster between mile 0 and 298 — 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|I 15 Business / 11th Avenue
Turn left onto I 15 Business / 11th Avenue
Lane positioning matters here
Use the straight / left / right lanes.
6
64.5 mi into trip|~1h 16m in
Take the exit toward I 90 East: Billings
Exit ramp - move to the correct lane early
Toward I 90 East: Billings
3
64.7 mi into trip|~1h 16m in|I 90
Merge onto I 90
Merge point - match speed before joining
5
245.6 mi into trip|~4h 18m in|I 90; US 87; US 212
Keep slight right at fork onto I 90; US 87; US 212 toward I 90 East: Sheridan
Highway fork - watch signs carefully
Toward I 90 East: Sheridan
5
298 mi into trip|~5h 8m in
Take the exit toward Crow Agency, Baaxuwuaashe
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward Crow Agency, Baaxuwuaashe
Fuel & Cost
Regular Gas
$46.51 one way
$93.02 round trip
$3.96/gal25.4 MPG avg104 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$49.02
$98.05
premium
$4.47
$52.56
$105.12
diesel
$4.80
$56.34
$112.69
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$47
Meals
$25–$50
Total
$72–$97
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 104.4 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $31 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
89.5
1
$31.33
$14.32
Efficient EV
74.6
0
$26.11
$11.94
EV Truck/SUV
119.4
1
$41.78
$19.10
Gas CO2
104 kg
EV CO2
35 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
Helena, MT
Night
in Helena on Saturday
Local time
10:36 PM
MDT
Current temp
94°F
Chance Showers And Thunderstorms
E 6 mph47% chanceLive forecast
Severe Thunderstorm Warning
Severe Thunderstorm Warning issued July 17 at 3:36PM MDT until July 17 at 4:00PM MDT by NWS Great Falls MT
Special Weather Statement
Special Weather Statement issued July 17 at 3:32PM MDT by NWS Great Falls MT
Destination
Crow Agency, MT
Night
in Crow Agency on Saturday
Local time
10:36 PM
MDT
Current temp
97°F
Mostly Sunny
ESE 13 mph9% chanceLive forecast
Severe Thunderstorm Warning
Severe Thunderstorm Warning issued July 17 at 3:36PM MDT until July 17 at 4:00PM MDT by NWS Great Falls MT
Special Weather Statement
Special Weather Statement issued July 17 at 3:32PM MDT by NWS Great Falls MT
88°F
Livingston, MT
149 mi in
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
3 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
5h 9m 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.
Little Bighorn Battlefield National Monument
National Monument
This land is a place to honor and reflect on the sacrifices made here on June 25 and 26, 1876, when Lakota, Cheyenne, and Arapaho warriors fought against a deliberate attack by the U.S. Army's 7th Cav...
4 mi from route
~9 min detour
$25
near mile 298.4
Park Closure: The Park is ONLY OPEN Friday, Saturday, and Sunday.
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
Expect a highway-focused drive for this route, with 99% of the mileage on major roads. You'll experience a long, uninterrupted stretch of 233.3 miles on I 90, offering consistent speed and ease of travel. This profile suggests a predominantly interstate experience, likely with broad Montana landscapes unfolding alongside the highway. The journey is designed for steady progress rather than winding, scenic byways.
99% highway — fuel and pacing are the main things to plan.
16 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 233.3 mi on I 90.
How Hard Is This Drive?
4/10
This is a straightforward highway drive that stays mostly on I 90 and US 12. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near I 15 Business / 11th Avenue.
Driving Effort4/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 5h 9m drive. You will face about 6 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 (I 15 Business / 11th Avenue): Lane positioning matters here; at 64.5 miles: Exit ramp - move to the correct lane early; at 64.7 miles (I 90): Merge point - match speed before joining.
Helena is the state capital of Montana, in the Western Central part of the state. Visitors come to see Helena’s historic Last Chance Gulch, and its mansion district once home to Helena’s gold mining millionaires. The city has 75 mi (121 km) of running or biking trails. The mighty Missouri River is not far, with opportunities for rafting and fly-fishing.
Top landmarks
•Montana State Capitol — state capitol building of the U.S. state of Montana
•Cathedral of Saint Helena — historic church in Montana, United States
•Helena Civic Center — historic building and community facility in Helena, Montana, USA
Crow Agency is a town in Southeast Montana. The namesake agency is in the town. The privately-owned town of Garryowen is nearby, as is the site of the Little Bighorn battlefield.
The longest stretch is about 233.3 miles on I 90. The full list of main roads is in the Roads section above.
Yes — we found about 14 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.
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 14 rest areas along the route for bathroom stops.
Mostly yes along the main roads, but rural stretches through MT 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 (I 15 Business / 11th Avenue): Lane positioning matters here; at 64.5 miles: Exit ramp - move to the correct lane early; at 64.7 miles (I 90): Merge point - match speed before joining.
Yes — Little Bighorn Battlefield National Monument. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 5.2 hours each way, a round trip means 10.3 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Crow Agency, MT before the return drive.
