Origin
Helena, MT
Morning in Helena on Saturday
Local time
9:57 AM
MDT
Current temp
62°F
Unavailable
Live forecast
Trip from Helena, MT to Boulder, MT
Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 18, 2026 · Editorial standards
Drive Time
32m
Distance
29.9 mi
48 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$5
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 30m
★
6 AM
0h 33m
8 AM
0h 38m
10 AM
0h 35m
12 PM
0h 34m
3 PM
0h 35m
5 PM
0h 38m
8 PM
0h 31m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Helena, MT
Wikimedia Commons
Boulder, MT
John De Leon
Trip Overview
The drive from Helena, MT to Boulder, MT covers 29.9 miles and takes about 32m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on First Special Service Force Memorial Highway, 11th Avenue, MT 69 for much of the mileage, and the overall profile is turn-heavy local drive. The longest uninterrupted segment is about 26.8 miles on First Special Service Force Memorial Highway. At current regular gas prices, budget about $4.74 one way before food or hotel costs.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 32m. Total distance: 29.9 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
32m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (4%). Straightforward navigation.
Scenic Drive
Turn-heavy local drive route profile.
Drive Character
Expect a 32m drive with frequent turns across 29.9 miles of local and secondary roads.
This route has more turning and local-road decision points than a simple highway run.
There are about 9 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
First Special Service Force Memorial Highway is the longest continuous segment at about 26.8 miles.
How Hard Is This Drive?
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 I 15 Business / 11th Avenue.
Driving Effort
3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 32m 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 1.6 miles (I 15 Business): Exit ramp - move to the correct lane early; at 28.8 miles: Exit ramp - move to the correct lane early.
Critical Maneuvers
5 of 6 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
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.
4
1.6 mi into trip
|
~4m in
|
I 15 Business
Take the exit onto I 15 Business toward I 15 South: Butte
Exit ramp - move to the correct lane early
Toward I 15 South: Butte
5
28.8 mi into trip
|
~30m in
Take the exit toward MT 69: Boulder
Exit ramp - move to the correct lane early
Exit 164
Toward MT 69: Boulder
4
29 mi into trip
|
~30m in
|
MT 69
Turn left onto MT 69
Navigation decision point
4
29.8 mi into trip
|
~32m in
|
West Centennial Avenue
Turn right onto West Centennial Avenue
Navigation decision point
Main Roads
| Road | Distance | Duration |
|---|---|---|
| First Special Service Force Memorial Highway | 26.8 mi | 25m |
| 11th Avenue | 1.4 mi | 3m |
| MT 69 | 0.8 mi | 1m |
| I 15 Business | 0.4 mi | <1m |
| Prospect Avenue | 0.2 mi | <1m |
| West Centennial Avenue | <0.1 mi | <1m |
| Cruse Avenue | <0.1 mi | <1m |
Longest stretch:
First Special Service Force Memorial Highway
— 26.8 mi, about 25m
Turn-by-Turn Driving Directions
Step-by-step road directions between Helena, MT and Boulder, 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
0.2 mi
·
22 sec
·
Prospect Avenue
4
Take the exit onto I 15 Business
0.4 mi
·
48 sec
·
I 15 Business
Toward I 15 South: Butte
5
Merge onto I 15
27 mi
·
25 min
·
First Special Service Force Memorial Highway
6
Take the exit
0.2 mi
·
36 sec
Exit 164
Toward MT 69: Boulder
7
Turn left onto MT 69
0.8 mi
·
1 min
·
MT 69
8
Turn right onto West Centennial Avenue
367 ft
·
16 sec
·
West Centennial Avenue
9
Arrive at destination
West Centennial Avenue
Fuel & Cost
Regular Gas
$4.74 one way
$9.48 round trip
$4.03/gal
25.4 MPG avg
11 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.22 | $4.97 | $9.93 |
| premium | $4.53 | $5.33 | $10.67 |
| diesel | $5.61 | $6.60 | $13.20 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$5
Estimated CO2 emission: 10.5 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $3 in charging · 0 stops · 70% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 9 | 0 | $3.14 | $1.44 |
| Efficient EV | 7.5 | 0 | $2.62 | $1.20 |
| EV Truck/SUV | 12 | 0 | $4.19 | $1.91 |
Gas CO2
10 kg
EV CO2
3 kg (70% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
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.
Destination
Boulder, MT
Morning in Boulder on Saturday
Local time
9:57 AM
MDT
Current temp
59°F
Unavailable
Live forecast
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 cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
32m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Helena, MT to Boulder, MT covers 29.9 miles and takes about 32m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are First Special Service Force Memorial Highway, 11th Avenue, MT 69. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 14.9 miles from Helena, MT. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $4.74 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
This is a straightforward 32m drive. You will face about 6 decision points, but nothing that requires special attention if you follow navigation.
The main spots that need attention: near the start (I 15 Business / 11th Avenue): Lane positioning matters here; at 1.6 miles (I 15 Business): Exit ramp - move to the correct lane early; at 28.8 miles: Exit ramp - move to the correct lane early.
The route from Helena, MT to Boulder, MT does not surface many named destination signs beyond the main corridor.
How this page is built
Compiled by the Trip.ovh planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, and EIA for fuel prices. See our methodology for refresh cadence and limitations.
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