How far is Boulder, CO from Castle Pines, CO?
The driving distance from Boulder, CO to Castle Pines, CO is about 52.8 miles (85 km), with a travel time of about 01h 08m by car.
- The straight-line flight distance is about 43.3 miles (69.7 km).
- For a round trip, plan for roughly 02h 17m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM MST.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 01h 08m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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.
The twentieth most populous city in the United States and the center of the Denver metropolitan area.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Clear
Driving Route Map
The map below follows the saved road route between Boulder and Castle Pines.
Turn-by-Turn Driving Directions
Step-by-step road directions between Boulder and Castle Pines.
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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
29 mi · 35 min · North Valley Highway
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17
Take the exit slight right toward Happy Canyon Road
1582 ft · 41 sec
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18
Turn right onto East Happy Canyon Road
134 m · 9 sec · East Happy Canyon Road
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19
Enter the roundabout and take exit 1 toward Lagae Road
4 m · 1 sec · Lagae Road
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20
Exit the roundabout onto Lagae Road
1834 ft · 57 sec · Lagae Road
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21
Turn left onto Chase Lane
1.2 km · 3 min · Chase Lane
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22
Continue on Lagae Road
1173 ft · 52 sec · Lagae Road
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23
At the end of the road, turn right onto Country Club Drive
762 ft · 34 sec · Country Club Drive
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24
Arrive at your destination
0 m · 1 sec · Country Club Parkway
Car Route Details
A richer read on the saved driving route between Boulder and Castle Pines.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
North Valley Highway
Merge slight left onto North Valley Highway
29 mi · 00h 35m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Sunny leaving Boulder and Clear near Castle Pines.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Boulder to Castle Pines?
The road trip is about 52.8 miles (85 km) and usually takes 01h 08m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Denver is a useful midpoint, sitting about 26.4 miles from Boulder and 26.4 miles from Castle Pines.
How much longer is the road route than the straight-line distance?
The direct path is about 43.3 miles (69.7 km), while the road route adds roughly 9.5 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 8:00 AM to 10:00 AM MST. If you want a more comfortable same-day return, try to leave by 4:12 PM MST.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $7.26 one way or $14.52 round trip. Estimated CO2 is about 16.5 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Boulder and Clear near Castle Pines.
Stop Ideas Near Denver
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Fairplay Park
Denver City Council
Town Hall Arts Center
Municipal Court Park
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Denver.
Denver (Bus Station), Colorado
Union Station
Boulder, Colorado
Pine Junction, CO
Flight Path Map
This map shows the direct air route between Boulder and Castle Pines. Straight-line distance: 43.32 mi (69.72 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 Castle Pines
City in Douglas County, Colorado, United States of America
| Population | 11,664 |
| Coordinates | 39.4580400, -104.8960900 |
| Altitude | 1999 |
| Country | United States |
End: Castle Pines (-104.89609, 39.45804)
Estimated Travel Time
Distance: 85 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 45m |
| 40 mph (64.37 km/h) | 01h 19m |
| 50 mph (80.47 km/h) | 01h 03m |
| 60 mph (96.56 km/h) | 00h 52m |
| 70 mph (112.65 km/h) | 00h 45m |
| 80 mph (129 km/h) | 00h 39m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.90 | $7.26 | $14.52 |
| Mid-grade | $4.29 | $7.98 | $15.96 |
| Premium | $4.61 | $8.58 | $17.16 |
| Diesel | $6.18 | $11.49 | $22.97 |
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 · Nov 09, 2026