How far is Keystone, CO from Thornton, CO?
The driving distance from Keystone, CO to Thornton, CO is about 81.2 miles (130.7 km), with a travel time of about 01h 32m by car.
- The straight-line flight distance is about 57 miles (91.8 km).
- For a round trip, plan for roughly 03h 04m 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 01h 32m.
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 Clear Creek County, Colorado, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Light Snow Likely
Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Keystone and Thornton.
Turn-by-Turn Driving Directions
Step-by-step road directions between Keystone and Thornton.
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1
Start on Soda Ridge Road
1.1 mi · 3 min · Soda Ridge Road
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2
At the end of the road, turn left onto West Keystone Road
1918 ft · 46 sec · West Keystone Road
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3
Continue on West Keystone Road
27 m · 6 sec · West Keystone Road
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4
Turn right
14.8 mi · 22 min
-
5
Keep slight left
558 ft · 14 sec
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6
Merge slight left
51.9 mi · 1 hr 1 min
-
7
Keep slight left to continue on Heartland Expressway
5.1 mi · 6 min · Heartland Expressway
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8
Take the exit slight right toward I 25: Fort Collins, Colorado Springs
1098 ft · 21 sec
-
9
Keep slight left to continue on I 25 North: Fort Collins
1.4 mi · 3 min
-
10
Merge slight left onto North Valley Highway
1.4 km · 1 min · North Valley Highway
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11
Keep slight right to continue on North Valley Highway
1.3 mi · 2 min · North Valley Highway
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12
Take the exit slight right toward Thornton Parkway
2280 ft · 43 sec
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13
Turn right onto Thornton Parkway
1.4 km · 2 min · Thornton Parkway
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14
Turn right onto Dorothy Boulevard
1077 ft · 51 sec · Dorothy Boulevard
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15
Turn right
36 m · 9 sec
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16
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Keystone and Thornton.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
West Keystone Road
Merge slight left
51.9 mi · 01h 01m
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.
Light Snow Likely leaving Keystone and Chance Rain Showers near Thornton.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Keystone to Thornton?
The road trip is about 81.2 miles (130.7 km) and usually takes 01h 32m 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?
Idaho Springs is a useful midpoint, sitting about 39.3 miles from Keystone and 42 miles from Thornton.
How much longer is the road route than the straight-line distance?
The direct path is about 57 miles (91.8 km), while the road route adds roughly 24.2 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 3:26 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $12.41 one way or $24.83 round trip. Estimated CO2 is about 25.5 kg one way.
What should you check before leaving?
Before you leave, expect Light Snow Likely around Keystone and Chance Rain Showers near Thornton.
Stop Ideas Near Idaho Springs
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 Idaho Springs.
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Flight Path Map
This map shows the direct air route between Keystone and Thornton. Straight-line distance: 57.05 mi (91.81 km).
#1 Keystone
Situated in Summit County, Colorado, within the Rocky Mountains, this community rests at a base elevation of 9,173 feet along the Snake River.
| Population | 0 |
| Coordinates | 39.5994300, -105.9872400 |
| Altitude | 2796 |
| Country | United States |
#2 Thornton
The seventh most populous city in Colorado.
| Population | 148,113 |
| Coordinates | 39.8680400, -104.9719200 |
| Altitude | 1631 |
| Country | United States |
End: (-104.971859, 39.868064)
Estimated Travel Time
Distance: 131 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 42m |
| 40 mph (64.37 km/h) | 02h 01m |
| 50 mph (80.47 km/h) | 01h 37m |
| 60 mph (96.56 km/h) | 01h 21m |
| 70 mph (112.65 km/h) | 01h 09m |
| 80 mph (129 km/h) | 01h 00m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.33 | $12.41 | $24.83 |
| Mid-grade | $4.72 | $13.54 | $27.09 |
| Premium | $5.06 | $14.53 | $29.06 |
| Diesel | $6.52 | $18.70 | $37.41 |
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 · Oct 15, 2026