How far is Alamosa, CO from Castle Rock, CO?
The driving distance from Alamosa, CO to Castle Rock, CO is about 205.2 miles (330.3 km), with a travel time of about 03h 19m by car.
- The straight-line flight distance is about 142.5 miles (229.3 km).
- For a round trip, plan for roughly 06h 39m 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 19m.
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.
Statutory Town in Pueblo County, Colorado, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between Alamosa and Castle Rock.
Turn-by-Turn Driving Directions
Step-by-step road directions between Alamosa and Castle Rock.
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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
32.5 mi · 33 min · Ronald Reagan Highway
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13
Take the exit slight right toward Plum Creek Parkway
1960 ft · 52 sec
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14
Turn right onto West Plum Creek Parkway
719 ft · 27 sec · West Plum Creek Parkway
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15
Turn left onto South Wilcox Street
1431 ft · 49 sec · South Wilcox Street
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16
Enter the roundabout and take exit 2 toward North Wilcox Street
16 m · 1 sec · North Wilcox Street
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17
Exit the roundabout onto North Wilcox Street
1123 ft · 42 sec · North Wilcox Street
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18
Turn right onto 3rd Street
105 m · 11 sec · 3rd Street
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19
Exit the roundabout onto 3rd Street
728 ft · 25 sec · 3rd Street
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20
Turn right onto North Cantril Street
27 m · 3 sec · North Cantril Street
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21
Arrive at your destination
0 m · 1 sec · North Cantril Street
Car Route Details
A richer read on the saved driving route between Alamosa and Castle Rock.
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 Castle Rock.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Alamosa to Castle Rock?
The road trip is about 205.2 miles (330.3 km) and usually takes 03h 19m 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 102.1 miles from Alamosa and 103.1 miles from Castle Rock.
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 62.7 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 10:20 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $26.77 one way or $53.55 round trip. Estimated CO2 is about 64.3 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Alamosa and Sunny near Castle Rock.
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 Alamosa and Castle Rock. Straight-line distance: 142.46 mi (229.27 km).
#1 Alamosa
City in Colorado, USA
| Population | 9,367 |
| Coordinates | 37.4694500, -105.8700200 |
| Altitude | 2299 |
| Country | United States |
#2 Castle Rock
The most populous city in Douglas County, Colorado.
| Population | 70,567 |
| Coordinates | 39.3722100, -104.8560900 |
| Altitude | 1897 |
| Country | United States |
End: Cantril Street (-104.856315, 39.3722)
Estimated Travel Time
Distance: 330 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 50m |
| 40 mph (64.37 km/h) | 05h 07m |
| 50 mph (80.47 km/h) | 04h 06m |
| 60 mph (96.56 km/h) | 03h 25m |
| 70 mph (112.65 km/h) | 02h 55m |
| 80 mph (129 km/h) | 02h 33m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $26.77 | $53.55 |
| Mid-grade | $4.08 | $29.57 | $59.14 |
| Premium | $4.39 | $31.79 | $63.58 |
| Diesel | $4.74 | $34.30 | $68.59 |
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.