How far is Alamosa, CO from Boulder, CO?
The driving distance from Alamosa, CO to Boulder, CO is about 230 miles (370.2 km), with a travel time of about 04h 04m by car.
- The straight-line flight distance is about 178.8 miles (287.8 km).
- For a round trip, plan for roughly 08h 09m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM MDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 04h 04m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Census-designated place in Pueblo County, Colorado
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between Alamosa and Boulder.
Turn-by-Turn Driving Directions
Step-by-step road directions between Alamosa and Boulder.
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1
Start on Ross Avenue
20 m · 7 sec · Ross Avenue
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2
Turn left onto Fourth Street
2320 ft · 1 min · Fourth Street
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3
At the end of the road, turn left onto Denver Avenue
159 m · 18 sec · Denver Avenue
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4
Continue on Broadway Avenue
1420 ft · 41 sec · Broadway Avenue
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5
Continue on Santa Fe Avenue
71.4 mi · 1 hr 28 min · Santa Fe Avenue
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6
Turn left onto Main Street
1938 ft · 44 sec · Main Street
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7
Continue on Main Street
64 m · 4 sec · Main Street
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8
Continue on Walsen Avenue
1.1 km · 1 min · Walsen Avenue
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9
Continue on US Highway 85/87
1.6 mi · 2 min · US Highway 85/87
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10
Take the ramp straight toward I 25 North: Pueblo
86.9 mi · 1 hr 31 min
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11
Continue on Monument Valley Freeway
8.5 mi · 10 min · Monument Valley Freeway
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12
Continue on Ronald Reagan Highway
68.6 mi · 1 hr 16 min · Ronald Reagan Highway
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13
Take the exit slight left toward US 36 West: Westminster, Boulder
2930 ft · 52 sec
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14
Merge slight right onto Denver–Boulder Turnpike
2.1 mi · 2 min · Denver–Boulder Turnpike
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15
Keep slight right to continue on Denver–Boulder Turnpike
1.7 mi · 2 min · Denver–Boulder Turnpike
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16
Keep slight right to continue on Denver–Boulder Turnpike
2.3 mi · 3 min · Denver–Boulder Turnpike
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17
Keep slight right to continue on Denver–Boulder Turnpike
1.9 mi · 2 min · Denver–Boulder Turnpike
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18
Keep slight right to continue on Denver–Boulder Turnpike
2.1 mi · 2 min · Denver–Boulder Turnpike
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19
Keep slight right to continue on Denver–Boulder Turnpike
2.9 mi · 3 min · Denver–Boulder Turnpike
-
20
Keep slight right to continue on Denver–Boulder Turnpike
2.4 mi · 3 min · Denver–Boulder Turnpike
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21
Keep slight right to continue on Denver–Boulder Turnpike
2.2 mi · 3 min · Denver–Boulder Turnpike
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22
Keep slight left to continue on Denver–Boulder Turnpike
2.3 mi · 3 min · Denver–Boulder Turnpike
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23
Continue on 28th Street
1.2 km · 2 min · 28th Street
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24
Turn left onto Arapahoe Avenue
1 km · 2 min · Arapahoe Avenue
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25
Turn right onto 19th Street
44 m · 11 sec · 19th Street
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26
Turn left
27 m · 5 sec
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27
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Alamosa and Boulder.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 25 North
Take the ramp straight toward I 25 North: Pueblo
86.9 mi · 01h 31m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Sunny leaving Alamosa and Sunny near Boulder.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Alamosa to Boulder?
The road trip is about 230 miles (370.2 km) and usually takes 04h 04m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Pueblo West is a useful midpoint, sitting about 130.4 miles from Alamosa and 99.6 miles from Boulder.
How much longer is the road route than the straight-line distance?
The direct path is about 178.8 miles (287.8 km), while the road route adds roughly 51.2 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 8:50 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $30.03 one way or $60.06 round trip. Estimated CO2 is about 72.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Alamosa and Sunny near Boulder.
Stop Ideas Near Pueblo West
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Pueblo West.
Pueblo, Colorado
Colorado Springs, Colorado
La Junta
Salida, CO
Flight Path Map
This map shows the direct air route between Alamosa and Boulder. Straight-line distance: 178.82 mi (287.78 km).
#1 Alamosa
City in Colorado, USA
| Population | 9,367 |
| Coordinates | 37.4694500, -105.8700200 |
| Altitude | 2299 |
| Country | United States |
#2 Boulder
The most populous city in Boulder County, Colorado.
| Population | 107,645 |
| Coordinates | 40.0149900, -105.2705500 |
| Altitude | 1624 |
| Country | United States |
End: (-105.27055, 40.014996)
Estimated Travel Time
Distance: 370 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 39m |
| 40 mph (64.37 km/h) | 05h 45m |
| 50 mph (80.47 km/h) | 04h 36m |
| 60 mph (96.56 km/h) | 03h 50m |
| 70 mph (112.65 km/h) | 03h 17m |
| 80 mph (129 km/h) | 02h 52m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $30.03 | $60.06 |
| Mid-grade | $4.08 | $33.16 | $66.32 |
| Premium | $4.39 | $35.65 | $71.31 |
| Diesel | $4.74 | $38.46 | $76.93 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Colorado · Apr 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.