How far is Johnstown, CO from Boulder, CO?
The driving distance from Johnstown, CO to Boulder, CO is about 37 miles (59.6 km), with a travel time of about 00h 48m by car.
- The straight-line flight distance is about 29.2 miles (47 km).
- For a round trip, plan for roughly 01h 36m 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 48m.
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 most populous city in Boulder County, 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 Johnstown and Boulder.
Turn-by-Turn Driving Directions
Step-by-step road directions between Johnstown and Boulder.
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1
Start on North Estes Avenue
793 ft · 37 sec · North Estes Avenue
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2
Turn right onto West South 1st Street
3.6 mi · 6 min · West South 1st Street
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3
Take the ramp slight left
1473 ft · 36 sec
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4
Merge slight left onto Dwight D. Eisenhower Highway
11.5 mi · 11 min · Dwight D. Eisenhower Highway
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5
Take the exit slight right toward CO 119 West
1528 ft · 29 sec
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6
Turn right onto Highway 119
3 mi · 4 min · Highway 119
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7
Continue on East Ken Pratt Boulevard
5.4 mi · 8 min · East Ken Pratt Boulevard
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8
Continue on Diagonal Highway
9.3 mi · 12 min · Diagonal Highway
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9
Continue on Foothills Parkway
1.9 mi · 3 min · Foothills Parkway
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10
Turn right onto Arapahoe Avenue
1.6 mi · 4 min · Arapahoe Avenue
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11
Turn right onto 19th Street
44 m · 11 sec · 19th Street
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12
Turn left
27 m · 5 sec
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13
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Johnstown and Boulder.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Dwight D. Eisenhower Highway
Merge slight left onto Dwight D. Eisenhower Highway
11.5 mi · 00h 11m
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 Johnstown and Snow Showers near Boulder.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Johnstown to Boulder?
The road trip is about 37 miles (59.6 km) and usually takes 00h 48m 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?
Longmont is a useful midpoint, sitting about 18.5 miles from Johnstown and 18.6 miles from Boulder.
How much longer is the road route than the straight-line distance?
The direct path is about 29.2 miles (47 km), while the road route adds roughly 7.8 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 4:54 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $4.84 one way or $9.69 round trip. Estimated CO2 is about 11.6 kg one way.
What should you check before leaving?
Before you leave, expect Rain And Snow Showers around Johnstown and Snow Showers near Boulder.
Stop Ideas Near Longmont
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Old Town Hall
Town of Frederick
Lafayette City Hall
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Longmont.
Longmont, Colorado
Boulder, Colorado
Fort Collins, Colorado
Denver (Bus Station), Colorado
Flight Path Map
This map shows the direct air route between Johnstown and Boulder. Straight-line distance: 29.2 mi (46.99 km).
#1 Johnstown
Municipality in Colorado, USA
| Population | 13,923 |
| Coordinates | 40.3369300, -104.9122000 |
| Altitude | 1479 |
| Country | United States |
#2 Boulder
The most populous city in Boulder County, Colorado.
| Population | 107,645 |
| Coordinates | 40.0149900, -105.2705500 |
| Altitude | 1624 |
| Country | United States |
End: (-105.27055, 40.014996)
Estimated Travel Time
Distance: 60 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 14m |
| 40 mph (64.37 km/h) | 00h 55m |
| 50 mph (80.47 km/h) | 00h 44m |
| 60 mph (96.56 km/h) | 00h 37m |
| 70 mph (112.65 km/h) | 00h 31m |
| 80 mph (129 km/h) | 00h 27m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $4.84 | $9.69 |
| Mid-grade | $4.08 | $5.35 | $10.70 |
| Premium | $4.39 | $5.75 | $11.50 |
| Diesel | $4.74 | $6.21 | $12.41 |
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.