How far is New Castle, CO from Broomfield, CO?
The driving distance from New Castle, CO to Broomfield, CO is about 177.2 miles (285.2 km), with a travel time of about 03h 00m by car.
- The straight-line flight distance is about 132.4 miles (213 km).
- For a round trip, plan for roughly 06h 00m 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 03h 00m.
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.
Town in Summit County, Colorado, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Slight Chance Snow Showers
Driving Route Map
The map below follows the saved road route between New Castle and Broomfield.
Turn-by-Turn Driving Directions
Step-by-step road directions between New Castle and Broomfield.
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1
Start on North 6th Street
144 m · 26 sec · North 6th Street
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2
Turn left onto West Main Street
3200 ft · 1 min · West Main Street
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3
Continue on Grand Army of the Republic Highway
2784 ft · 53 sec · Grand Army of the Republic Highway
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4
Enter the roundabout and take exit 1 toward Castle Valley Boulevard
4 m · 1 sec · Castle Valley Boulevard
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5
Exit the roundabout onto Castle Valley Boulevard
962 ft · 22 sec · Castle Valley Boulevard
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6
Take the ramp left toward I 70: Denver
1354 ft · 33 sec
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7
Merge slight left
164.2 mi · 3 hr 10 min
-
8
Keep slight left to continue on Heartland Expressway
1.3 mi · 2 min · Heartland Expressway
-
9
Take the exit slight right toward CO 95: Sheridan Boulevard
1606 ft · 40 sec
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10
Turn left onto Sheridan Boulevard
4.6 mi · 8 min · Sheridan Boulevard
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11
Turn left onto US 36 West: Boulder
1765 ft · 37 sec
-
12
Keep slight left to continue on US 36 West
876 ft · 23 sec
-
13
Merge slight left onto Denver–Boulder Turnpike
1.5 km · 1 min · Denver–Boulder Turnpike
-
14
Keep slight right to continue on Denver–Boulder Turnpike
1.9 mi · 2 min · Denver–Boulder Turnpike
-
15
Keep slight right to continue on Denver–Boulder Turnpike
1.2 km · 52 sec · Denver–Boulder Turnpike
-
16
Take the exit slight right toward CO 121: Wadsworth Parkway
1951 ft · 42 sec
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17
Turn right
1257 ft · 30 sec
-
18
Continue straight
62 m · 5 sec
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19
Turn right onto West Midway Boulevard
976 ft · 31 sec · West Midway Boulevard
-
20
Turn right onto Nickel Street
682 ft · 22 sec · Nickel Street
-
21
Turn left onto West 3rd Avenue
83 m · 17 sec · West 3rd Avenue
-
22
Turn left
58 m · 14 sec
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23
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between New Castle and Broomfield.
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 70
Merge slight left
164 mi · 03h 10m
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.
Mostly Sunny leaving New Castle and Slight Chance Snow Showers near Broomfield.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from New Castle to Broomfield?
The road trip is about 177.2 miles (285.2 km) and usually takes 03h 00m 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?
Frisco is a useful midpoint, sitting about 88.5 miles from New Castle and 88.7 miles from Broomfield.
How much longer is the road route than the straight-line distance?
The direct path is about 132.4 miles (213 km), while the road route adds roughly 44.8 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 12:30 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $23.11 one way or $46.23 round trip. Estimated CO2 is about 55.5 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around New Castle and Slight Chance Snow Showers near Broomfield.
Stop Ideas Near Frisco
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 Frisco.
Frisco, Colorado
Vail, Colorado
Fairplay, CO
Fraser – Winter Park
Flight Path Map
This map shows the direct air route between New Castle and Broomfield. Straight-line distance: 132.34 mi (212.98 km).
#1 New Castle
Colorado
| Population | 4,962 |
| Coordinates | 39.5727600, -107.5364400 |
| Altitude | 1706 |
| Country | United States |
#2 Broomfield
A city in Broomfield County, Colorado.
| Population | 72,236 |
| Coordinates | 39.9205400, -105.0866500 |
| Altitude | 1644 |
| Country | United States |
End: (-105.086461, 39.920417)
Estimated Travel Time
Distance: 285 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 54m |
| 40 mph (64.37 km/h) | 04h 25m |
| 50 mph (80.47 km/h) | 03h 32m |
| 60 mph (96.56 km/h) | 02h 57m |
| 70 mph (112.65 km/h) | 02h 31m |
| 80 mph (129 km/h) | 02h 12m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $23.11 | $46.23 |
| Mid-grade | $4.08 | $25.53 | $51.05 |
| Premium | $4.39 | $27.44 | $54.89 |
| Diesel | $4.74 | $29.61 | $59.21 |
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 18, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.