How far is Broomfield, CO from Castle Rock, CO?
The driving distance from Broomfield, CO to Castle Rock, CO is about 46.1 miles (74.2 km), with a travel time of about 00h 49m by car.
- The straight-line flight distance is about 39.8 miles (64.1 km).
- For a round trip, plan for roughly 01h 39m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM MDT.
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 00h 49m.
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.
City in Colorado
Route Weather Snapshot
Check the forecast at both ends before you head out.
Rain And Snow Showers
Snow Showers
Driving Route Map
The map below follows the saved road route between Broomfield and Castle Rock.
Turn-by-Turn Driving Directions
Step-by-step road directions between Broomfield and Castle Rock.
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1
Start on the route
58 m · 16 sec
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2
At the end of the road, turn right onto West 3rd Avenue
83 m · 20 sec · West 3rd Avenue
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3
Turn left onto Nickel Street
798 ft · 26 sec · Nickel Street
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4
Turn right
43 m · 3 sec
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5
Keep slight left to continue on CO 121 South
1525 ft · 45 sec
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6
Turn straight
2276 ft · 1 min
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7
Turn left onto US 36 East: Denver
1737 ft · 44 sec
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8
Merge slight left onto Denver–Boulder Turnpike
1.2 mi · 1 min · Denver–Boulder Turnpike
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9
Keep slight right to continue on Denver–Boulder Turnpike
1.9 mi · 2 min · Denver–Boulder Turnpike
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10
Keep slight right to continue on Denver–Boulder Turnpike
2.5 mi · 3 min · Denver–Boulder Turnpike
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11
Keep slight right to continue on Denver–Boulder Turnpike
2 mi · 2 min · Denver–Boulder Turnpike
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12
Keep slight right to continue on Denver–Boulder Turnpike
1.1 mi · 1 min · Denver–Boulder Turnpike
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13
Take the exit slight right toward I 25 south: Denver
2497 ft · 47 sec
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14
Continue on I 25 south: Denver
2037 ft · 34 sec
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15
Merge slight left onto North Valley Highway
34.2 mi · 41 min · North Valley Highway
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16
Take the exit slight right toward Wilcox Street, Wolfensberger Road
1213 ft · 32 sec
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17
Turn left onto East Wolfensberger Road
132 m · 21 sec · East Wolfensberger Road
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18
Continue on North Wilcox Street
2093 ft · 1 min · North Wilcox Street
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19
Turn left onto 5th Street
979 ft · 37 sec · 5th Street
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20
Turn right onto North Cantril Street
837 ft · 29 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 Broomfield 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.
North Valley Highway
Merge slight left onto North Valley Highway
34.2 mi · 00h 41m
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.
Rain And Snow Showers leaving Broomfield and Snow Showers near Castle Rock.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Broomfield to Castle Rock?
The road trip is about 46.1 miles (74.2 km) and usually takes 00h 49m 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?
Glendale is a useful midpoint, sitting about 23.1 miles from Broomfield and 23.1 miles from Castle Rock.
How much longer is the road route than the straight-line distance?
The direct path is about 39.8 miles (64.1 km), while the road route adds roughly 6.3 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 MDT. If you want a more comfortable same-day return, try to leave by 4:50 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $6.03 one way or $12.06 round trip. Estimated CO2 is about 14.5 kg one way.
What should you check before leaving?
Before you leave, expect Rain And Snow Showers around Broomfield and Snow Showers near Castle Rock.
Stop Ideas Near Glendale
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 Glendale.
Denver (Bus Station), Colorado
Union Station
Pine Junction, CO
Boulder, Colorado
Flight Path Map
This map shows the direct air route between Broomfield and Castle Rock. Straight-line distance: 39.82 mi (64.09 km).
#1 Broomfield
A city in Broomfield County, Colorado.
| Population | 72,236 |
| Coordinates | 39.9205400, -105.0866500 |
| Altitude | 1644 |
| 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: 74 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 32m |
| 40 mph (64.37 km/h) | 01h 09m |
| 50 mph (80.47 km/h) | 00h 55m |
| 60 mph (96.56 km/h) | 00h 46m |
| 70 mph (112.65 km/h) | 00h 39m |
| 80 mph (129 km/h) | 00h 34m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $6.03 | $12.06 |
| Mid-grade | $4.08 | $6.66 | $13.31 |
| Premium | $4.39 | $7.16 | $14.31 |
| Diesel | $4.74 | $7.72 | $15.44 |
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 17, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.