How far is Thornton, CO from Keystone, CO?
The driving distance from Thornton, CO to Keystone, CO is about 78.7 miles (126.7 km), with a travel time of about 01h 43m by car.
- The straight-line flight distance is about 57 miles (91.8 km).
- For a round trip, plan for roughly 03h 27m 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 43m.
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.
Chance Rain Showers
Sunny
Driving Route Map
The map below follows the saved road route between Thornton and Keystone.
Turn-by-Turn Driving Directions
Step-by-step road directions between Thornton and Keystone.
-
1
Start on the route
23 m · 12 sec
-
2
Turn left onto Dorothy Boulevard
1165 ft · 59 sec · Dorothy Boulevard
-
3
At the end of the road, turn left onto Thornton Parkway
1.6 km · 2 min · Thornton Parkway
-
4
Turn left onto I 25 South: Colorado Springs
1973 ft · 40 sec
-
5
Merge slight left onto North Valley Highway
1.2 mi · 2 min · North Valley Highway
-
6
Keep slight right to continue on North Valley Highway
1.5 mi · 2 min · North Valley Highway
-
7
Take the exit slight right toward I 76 West: Arvada, Grand Junction
1.5 km · 2 min
-
8
Merge slight left onto Heartland Expressway
5.2 mi · 6 min · Heartland Expressway
-
9
Merge slight left
52.2 mi · 1 hr 2 min
-
10
Take the exit slight right toward US 6 West: Loveland Pass
2534 ft · 54 sec
-
11
Turn slight left
50 m · 8 sec
-
12
Turn right
14.3 mi · 22 min
-
13
Turn left onto West Keystone Road
41 m · 10 sec · West Keystone Road
-
14
At the end of the road, turn left onto West Keystone Road
1918 ft · 56 sec · West Keystone Road
-
15
Turn right onto Soda Ridge Road
1.1 mi · 3 min · Soda Ridge Road
-
16
Arrive at your destination
0 m · 1 sec · Soda Ridge Road
Car Route Details
A richer read on the saved driving route between Thornton and Keystone.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Heartland Expressway
Merge slight left
52.2 mi · 01h 02m
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.
Chance Rain Showers leaving Thornton and Sunny near Keystone.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Thornton to Keystone?
The road trip is about 78.7 miles (126.7 km) and usually takes 01h 43m 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 Thornton and 39.4 miles from Keystone.
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 21.7 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 3:02 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $12.02 one way or $24.05 round trip. Estimated CO2 is about 24.7 kg one way.
What should you check before leaving?
Before you leave, expect Chance Rain Showers around Thornton and Sunny near Keystone.
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.
Pine Junction, CO
Fraser – Winter Park
Boulder, Colorado
Union Station
Flight Path Map
This map shows the direct air route between Thornton and Keystone. Straight-line distance: 57.05 mi (91.81 km).
#1 Thornton
The seventh most populous city in Colorado.
| Population | 148,113 |
| Coordinates | 39.8680400, -104.9719200 |
| Altitude | 1631 |
| Country | United States |
#2 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 |
End: Keystone (-105.98724, 39.59943)
Estimated Travel Time
Distance: 127 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 37m |
| 40 mph (64.37 km/h) | 01h 58m |
| 50 mph (80.47 km/h) | 01h 34m |
| 60 mph (96.56 km/h) | 01h 18m |
| 70 mph (112.65 km/h) | 01h 07m |
| 80 mph (129 km/h) | 00h 58m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.33 | $12.02 | $24.05 |
| Mid-grade | $4.72 | $13.12 | $26.24 |
| Premium | $5.06 | $14.08 | $28.15 |
| Diesel | $6.52 | $18.12 | $36.23 |
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