Origin
Castle Rock, CO
Morning in Castle Rock on Saturday
Local time
6:01 AM
MDT
Current temp
73°F
Unavailable
Live forecast
Trip from Castle Rock, CO to Broomfield, CO
Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 18, 2026 · Editorial standards
Drive Time
57m
Distance
45.8 mi
74 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$7
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 53m
★
6 AM
0h 58m
8 AM
1h 7m
10 AM
1h 1m
12 PM
1h 0m
3 PM
1h 2m
5 PM
1h 7m
8 PM
0h 55m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Castle Rock, CO
Wikimedia Commons
Broomfield, CO
Owen.outdoors
Trip Overview
Spanning 45.8 miles, this connection between Castle Rock and Broomfield is a straightforward commute across the Colorado Mountain West. You can expect a drive time of approximately 48 minutes, making it a perfect candidate for a single-day trip. With a fuel budget of just $7, it is an economical route to navigate. Because the journey is relatively short, there is no need to plan for overnight stays or complex logistics. Whether you are heading north for business or personal errands, the trip is manageable and efficient for any driver.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 57m. Total distance: 45.8 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
57m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (95%). Some complex stretches to watch for.
Drive Character
Expect a turn-heavy local drive as you navigate out of Castle Rock via 3rd Street and North Wilcox Street. Once you transition onto I-25 North, the character of the road shifts significantly toward a standard interstate experience. While the route is composed of a mix of local surface streets and major highway segments, you will find it lacks long, monotonous stretches. Because the highway share is 0% of the total distance, you should prepare for a more involved driving experience as you transition between local roads and the main interstate artery.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 20 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
I 25 is the longest continuous segment at about 34.4 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 25 and Denver–Boulder Turnpike. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.1 miles in near 3rd Street.
Driving Effort
10/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 17 significant decision points across 45.8 miles, you will need to stay alert — especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 0.1 miles (3rd Street): Roundabout - know your exit number before entering; at 35.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 42.1 miles (US 36 / Denver–Boulder Turnpike): Highway fork - watch signs carefully. Lane positioning matters here.
Critical Maneuvers
5 of 17 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
7
0.1 mi into trip
|
~0m in
|
3rd Street
Enter roundabout onto 3rd Street
Roundabout - know your exit number before entering
8
35.5 mi into trip
|
~44m in
Take the exit toward US 36 West: Westminster, Boulder
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left lane.
Exit 217A
Toward US 36 West: Westminster, Boulder
6
42.1 mi into trip
|
~51m in
|
US 36 / Denver–Boulder Turnpike
Keep slight right at fork onto US 36 / Denver–Boulder Turnpike
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
6
44.7 mi into trip
|
~55m in
Take the exit toward CO 121: Wadsworth Parkway
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight right lanes.
Toward CO 121: Wadsworth Parkway
6
45.6 mi into trip
|
~56m in
|
Nickel Street
Turn right onto Nickel Street
Lane positioning matters here
Use the right lane.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Castle Rock, CO to Broomfield, CO, road signs begin pointing toward Boulder along the way.
Boulder
35.5 mi in
|
~44m
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 25 | 34.4 mi | 40m |
| Denver–Boulder Turnpike | 8.7 mi | 10m |
| North Wilcox Street | 0.5 mi | 1m |
| CO 121 | 0.2 mi | <1m |
| 3rd Street | 0.2 mi | <1m |
| West Midway Boulevard | 0.2 mi | <1m |
| Nickel Street | 0.1 mi | <1m |
| West 3rd Avenue | <0.1 mi | <1m |
Longest stretch:
I 25
— 34.4 mi, about 40m
Turn-by-Turn Driving Directions
Step-by-step road directions between Castle Rock, CO and Broomfield, CO.
1
Start on North Cantril Street
90 ft
·
8 sec
·
North Cantril Street
2
Turn left onto 3rd Street
0.1 mi
·
22 sec
·
3rd Street
3
Continue on 3rd Street
442 ft
·
17 sec
·
3rd Street
4
Turn right onto North Wilcox Street
0.5 mi
·
1 min
·
North Wilcox Street
5
Take the ramp
0.3 mi
·
41 sec
Toward I 25 North
6
Merge onto I 25
34 mi
·
40 min
·
I 25
Use the straight / slight right lanes.
7
Take the exit
0.6 mi
·
51 sec
Exit 217A
Toward US 36 West: Westminster, Boulder
Use the slight left lane.
8
Merge onto US 36
2.1 mi
·
2 min
·
Denver–Boulder Turnpike
9
Keep slight right at fork onto US 36
1.7 mi
·
1 min
·
Denver–Boulder Turnpike
10
Keep slight right at fork onto US 36
2.3 mi
·
2 min
·
Denver–Boulder Turnpike
11
Keep slight right at fork onto US 36
1.9 mi
·
2 min
·
Denver–Boulder Turnpike
Use the straight / slight right lanes.
12
Keep slight right at fork onto US 36
0.8 mi
·
52 sec
·
Denver–Boulder Turnpike
13
Take the exit
0.4 mi
·
42 sec
Toward CO 121: Wadsworth Parkway
Use the straight / slight right lanes.
14
Turn right onto CO 121
0.2 mi
·
30 sec
·
CO 121
15
Continue on US 287
204 ft
·
5 sec
·
US 287
16
Turn right onto West Midway Boulevard
0.2 mi
·
31 sec
·
West Midway Boulevard
Use the right lane.
17
Turn right onto Nickel Street
0.1 mi
·
22 sec
·
Nickel Street
Use the right lane.
18
Turn left onto West 3rd Avenue
273 ft
·
17 sec
·
West 3rd Avenue
Use the left lane.
19
Turn left
192 ft
·
14 sec
20
Arrive at destination
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 22.9 mi from Castle Rock, CO · 29m into the drive
Mid-route town
Meal stop
23 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
Pacing Suggestions
Fuel and coffee
A short stop after about 45.8 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 22.9 miles from Castle Rock, CO, which is a good place for a longer meal and fuel stop.
Arriving in Broomfield, CO
The final approach into Broomfield, CO usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Broomfield, CO.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$6.90 one way
$13.80 round trip
$3.83/gal
25.4 MPG avg
16 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.05 | $7.31 | $14.61 |
| premium | $4.39 | $7.92 | $15.85 |
| diesel | $5.61 | $10.11 | $20.22 |
Estimated Tolls: $0.60
Denver–Boulder Turnpike
(8.7 mi)
$0.60
Toll estimates based on average 2024-2025 rates. EZ-Pass/SunPass discounts may lower the actual cost.
Drive Cost (one way)
Fuel
$7
Tolls
$1
Total
$8
Estimated CO2 emission: 16 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $5 in charging · 0 stops · 69% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 13.7 | 0 | $4.81 | $2.20 |
| Efficient EV | 11.5 | 0 | $4.01 | $1.83 |
| EV Truck/SUV | 18.3 | 0 | $6.41 | $2.93 |
Gas CO2
16 kg
EV CO2
5 kg (69% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Destination
Broomfield, CO
Morning in Broomfield on Saturday
Local time
6:01 AM
MDT
Current temp
75°F
Unavailable
Live forecast
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
2 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
57m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Castle Rock, CO to Broomfield, CO covers 45.8 miles and takes about 57m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 25, Denver–Boulder Turnpike, North Wilcox Street. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 22.9 miles from Castle Rock, CO. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $6.90 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
This is a demanding drive. With 17 significant decision points across 45.8 miles, you will need to stay alert — especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
The main spots that need attention: at 0.1 miles (3rd Street): Roundabout - know your exit number before entering; at 35.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 42.1 miles (US 36 / Denver–Boulder Turnpike): Highway fork - watch signs carefully. Lane positioning matters here.
On the drive from Castle Rock, CO to Broomfield, CO, road signs begin pointing toward Boulder along the way.
How this page is built
Compiled by the Trip.ovh planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
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