How far is Castle Rock, CO from Alamosa, CO?
The driving distance from Castle Rock, CO to Alamosa, CO is about 204.2 miles (328.7 km), with a travel time of about 03h 51m by car.
- The straight-line flight distance is about 142.5 miles (229.3 km).
- For a round trip, plan for roughly 07h 42m 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 03h 51m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Statutory Town in Pueblo County, Colorado, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Sunny
Driving Route Map
The map below follows the saved road route between Castle Rock and Alamosa.
Turn-by-Turn Driving Directions
Step-by-step road directions between Castle Rock and Alamosa.
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1
Start on North Cantril Street
27 m · 8 sec · North Cantril Street
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2
Turn left onto 3rd Street
641 ft · 23 sec · 3rd Street
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3
Exit the roundabout onto 3rd Street
135 m · 21 sec · 3rd Street
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4
Turn left onto North Wilcox Street
1119 ft · 38 sec · North Wilcox Street
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5
Enter the roundabout and take exit 2 toward South Wilcox Street
12 m · 1 sec · South Wilcox Street
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6
Exit the roundabout onto South Wilcox Street
1432 ft · 53 sec · South Wilcox Street
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7
Turn right onto West Plum Creek Parkway
981 ft · 35 sec · West Plum Creek Parkway
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8
Turn left onto Frontage Road
860 ft · 29 sec · Frontage Road
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9
Take the ramp left toward I 25 South
1440 ft · 37 sec
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10
Merge slight left
32.4 mi · 33 min
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11
Continue on Monument Valley Freeway
8.8 mi · 10 min · Monument Valley Freeway
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12
Continue on Ronald Reagan Highway
915 ft · 12 sec · Ronald Reagan Highway
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13
Keep slight left to continue on Ronald Reagan Highway
22.7 mi · 23 min · Ronald Reagan Highway
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14
Continue on John F. Kennedy Memorial Highway
12.9 mi · 13 min · John F. Kennedy Memorial Highway
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15
Continue on North Freeway
2.6 mi · 3 min · North Freeway
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16
Take the exit slight right toward 29th Street
2351 ft · 33 sec
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17
Merge slight left onto North Freeway
1 mi · 1 min · North Freeway
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18
Take the exit slight right toward 13th Street
792 ft · 12 sec
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19
Continue straight
1189 ft · 18 sec
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20
Merge slight left onto North Freeway
6.1 mi · 8 min · North Freeway
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21
Continue on John F. Kennedy Memorial Highway
40.5 mi · 41 min · John F. Kennedy Memorial Highway
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22
Take the exit slight right toward South I 25 Business, US 160 West: Walsenburg, Alamosa
2.8 mi · 5 min
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23
Turn right onto West 7th Street
71.4 mi · 1 hr 27 min · West 7th Street
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24
Continue on Broadway Avenue
1420 ft · 39 sec · Broadway Avenue
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25
Continue on Denver Avenue
159 m · 18 sec · Denver Avenue
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26
Turn right onto Fourth Street
2320 ft · 1 min · Fourth Street
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27
Turn right onto Ross Avenue
20 m · 2 sec · Ross Avenue
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28
Arrive at your destination
0 m · 1 sec · Ross Avenue
Car Route Details
A richer read on the saved driving route between Castle Rock 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.
Sunny leaving Castle Rock and Sunny near Alamosa.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Castle Rock to Alamosa?
The road trip is about 204.2 miles (328.7 km) and usually takes 03h 51m 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?
Rye is a useful midpoint, sitting about 102.2 miles from Castle Rock and 102.1 miles from Alamosa.
How much longer is the road route than the straight-line distance?
The direct path is about 142.5 miles (229.3 km), while the road route adds roughly 61.7 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 9:18 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $26.66 one way or $53.33 round trip. Estimated CO2 is about 64.1 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Castle Rock and Sunny near Alamosa.
Stop Ideas Near Rye
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 Rye.
Pueblo, Colorado
Trinidad
Alamosa, CO
Colorado Springs, Colorado
Flight Path Map
This map shows the direct air route between Castle Rock and Alamosa. Straight-line distance: 142.46 mi (229.27 km).
#1 Castle Rock
The most populous city in Douglas County, Colorado.
| Population | 70,567 |
| Coordinates | 39.3722100, -104.8560900 |
| Altitude | 1897 |
| 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: 329 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 48m |
| 40 mph (64.37 km/h) | 05h 06m |
| 50 mph (80.47 km/h) | 04h 05m |
| 60 mph (96.56 km/h) | 03h 24m |
| 70 mph (112.65 km/h) | 02h 55m |
| 80 mph (129 km/h) | 02h 32m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $26.66 | $53.33 |
| Mid-grade | $4.08 | $29.45 | $58.89 |
| Premium | $4.39 | $31.66 | $63.32 |
| Diesel | $4.74 | $34.15 | $68.31 |
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.