How far is Boulder, CO from Alamosa, CO?
The driving distance from Boulder, CO to Alamosa, CO is about 260.7 miles (419.5 km), with a travel time of about 04h 57m by car.
- The straight-line flight distance is about 178.8 miles (287.8 km).
- For a round trip, plan for roughly 09h 54m 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 57m.
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.
Chance Rain Showers then Slight Chance Rain And Snow Showers
Chance Snow Showers
Driving Route Map
The map below follows the saved road route between Boulder and Alamosa.
Turn-by-Turn Driving Directions
Step-by-step road directions between Boulder and Alamosa.
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1
Start on the route
27 m · 7 sec
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2
Turn right onto 19th Street
44 m · 14 sec · 19th Street
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3
Turn left onto Arapahoe Avenue
3210 ft · 2 min · Arapahoe Avenue
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4
Turn right onto 28th Street
1.2 km · 2 min · 28th Street
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5
Turn straight onto Denver–Boulder Turnpike
3.4 mi · 4 min · Denver–Boulder Turnpike
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6
Keep slight right to continue on Denver–Boulder Turnpike
1.7 mi · 2 min · Denver–Boulder Turnpike
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7
Keep slight right to continue on Denver–Boulder Turnpike
2.6 mi · 3 min · Denver–Boulder Turnpike
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8
Keep slight right to continue on Denver–Boulder Turnpike
2.4 mi · 3 min · Denver–Boulder Turnpike
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9
Keep slight right to continue on Denver–Boulder Turnpike
2.2 mi · 3 min · Denver–Boulder Turnpike
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10
Keep slight right to continue on Denver–Boulder Turnpike
1.9 mi · 2 min · Denver–Boulder Turnpike
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11
Keep slight right to continue on Denver–Boulder Turnpike
2.5 mi · 3 min · Denver–Boulder Turnpike
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12
Keep slight right to continue on Denver–Boulder Turnpike
2 mi · 2 min · Denver–Boulder Turnpike
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13
Keep slight right to continue on Denver–Boulder Turnpike
1.1 mi · 1 min · Denver–Boulder Turnpike
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14
Take the exit slight right toward I 25 south: Denver
2497 ft · 47 sec
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15
Continue on I 25 south: Denver
2037 ft · 34 sec
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16
Merge slight left onto North Valley Highway
68.1 mi · 1 hr 15 min · North Valley Highway
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17
Continue on Monument Valley Freeway
8.8 mi · 10 min · Monument Valley Freeway
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18
Continue on Ronald Reagan Highway
915 ft · 12 sec · Ronald Reagan Highway
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19
Keep slight left to continue on Ronald Reagan Highway
22.7 mi · 23 min · Ronald Reagan Highway
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20
Continue on John F. Kennedy Memorial Highway
12.9 mi · 13 min · John F. Kennedy Memorial Highway
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21
Continue on North Freeway
2.6 mi · 3 min · North Freeway
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22
Take the exit slight right toward 29th Street
2351 ft · 33 sec
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23
Merge slight left onto North Freeway
1 mi · 1 min · North Freeway
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24
Take the exit slight right toward 13th Street
792 ft · 12 sec
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25
Continue straight
1189 ft · 18 sec
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26
Merge slight left onto North Freeway
6.1 mi · 8 min · North Freeway
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27
Continue on John F. Kennedy Memorial Highway
40.5 mi · 41 min · John F. Kennedy Memorial Highway
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28
Take the exit slight right toward South I 25 Business, US 160 West: Walsenburg, Alamosa
2.8 mi · 5 min
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29
Turn right onto West 7th Street
71.4 mi · 1 hr 27 min · West 7th Street
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30
Continue on Broadway Avenue
1420 ft · 39 sec · Broadway Avenue
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31
Continue on Denver Avenue
159 m · 18 sec · Denver Avenue
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32
Turn right onto Fourth Street
2320 ft · 1 min · Fourth Street
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33
Turn right onto Ross Avenue
20 m · 2 sec · Ross Avenue
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34
Arrive at your destination
0 m · 1 sec · Ross Avenue
Car Route Details
A richer read on the saved driving route between Boulder and Alamosa.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
West 7th Street
Turn right onto West 7th Street
71.4 mi · 01h 27m
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.
Chance Rain Showers then Slight Chance Rain And Snow Showers leaving Boulder and Chance Snow Showers near Alamosa.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Boulder to Alamosa?
The road trip is about 260.7 miles (419.5 km) and usually takes 04h 57m 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 Boulder and 130.3 miles from Alamosa.
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 81.9 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 7:06 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $34.02 one way or $68.04 round trip. Estimated CO2 is about 81.8 kg one way.
What should you check before leaving?
Before you leave, expect Chance Rain Showers then Slight Chance Rain And Snow Showers around Boulder and Chance Snow Showers near Alamosa.
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 Boulder and Alamosa. Straight-line distance: 178.82 mi (287.78 km).
#1 Boulder
The most populous city in Boulder County, Colorado.
| Population | 107,645 |
| Coordinates | 40.0149900, -105.2705500 |
| Altitude | 1624 |
| Country | United States |
#2 Alamosa
City in Colorado, USA
| Population | 9,367 |
| Coordinates | 37.4694500, -105.8700200 |
| Altitude | 2299 |
| Country | United States |
End: Alamosa (-105.87002, 37.46945)
Estimated Travel Time
Distance: 420 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 08h 41m |
| 40 mph (64.37 km/h) | 06h 31m |
| 50 mph (80.47 km/h) | 05h 12m |
| 60 mph (96.56 km/h) | 04h 20m |
| 70 mph (112.65 km/h) | 03h 43m |
| 80 mph (129 km/h) | 03h 15m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $34.02 | $68.04 |
| Mid-grade | $4.08 | $37.57 | $75.15 |
| Premium | $4.39 | $40.40 | $80.79 |
| Diesel | $4.74 | $43.58 | $87.16 |
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 15, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.