How far is Granby, CO from Thornton, CO?
The driving distance from Granby, CO to Thornton, CO is about 93 miles (149.7 km), with a travel time of about 01h 54m by car.
- The straight-line flight distance is about 53.4 miles (85.9 km).
- For a round trip, plan for roughly 03h 48m 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 54m.
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.
Statutory Town in Clear Creek County, Colorado, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Snow Showers
Mostly Sunny then Slight Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Granby and Thornton.
Turn-by-Turn Driving Directions
Step-by-step road directions between Granby and Thornton.
-
1
Start on the route
43 m · 12 sec
-
2
Turn right onto North 2nd Street
57 m · 13 sec · North 2nd Street
-
3
Turn left onto East Agate Avenue
15 mi · 26 min · East Agate Avenue
-
4
Continue on South Zerex Street
1.6 mi · 2 min · South Zerex Street
-
5
Continue on Main Street
28.7 mi · 48 min · Main Street
-
6
Take the ramp straight
1.1 km · 2 min
-
7
Merge slight left
36.5 mi · 43 min
-
8
Keep slight left to continue on Heartland Expressway
5.1 mi · 6 min · Heartland Expressway
-
9
Take the exit slight right toward I 25: Fort Collins, Colorado Springs
1098 ft · 21 sec
-
10
Keep slight left to continue on I 25 North: Fort Collins
1.4 mi · 3 min
-
11
Merge slight left onto North Valley Highway
1.4 km · 1 min · North Valley Highway
-
12
Keep slight right to continue on North Valley Highway
1.3 mi · 2 min · North Valley Highway
-
13
Take the exit slight right toward Thornton Parkway
2280 ft · 43 sec
-
14
Turn right onto Thornton Parkway
1.4 km · 2 min · Thornton Parkway
-
15
Turn right onto Dorothy Boulevard
1077 ft · 51 sec · Dorothy Boulevard
-
16
Turn right
36 m · 9 sec
-
17
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Granby and Thornton.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Main Street
Merge slight left
36.5 mi · 00h 43m
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 Snow Showers leaving Granby and Mostly Sunny then Slight 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 Granby to Thornton?
The road trip is about 93 miles (149.7 km) and usually takes 01h 54m 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?
Empire is a useful midpoint, sitting about 46.5 miles from Granby and 46.6 miles from Thornton.
How much longer is the road route than the straight-line distance?
The direct path is about 53.4 miles (85.9 km), while the road route adds roughly 39.6 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 2:42 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $12.13 one way or $24.26 round trip. Estimated CO2 is about 29.1 kg one way.
What should you check before leaving?
Before you leave, expect Chance Snow Showers around Granby and Mostly Sunny then Slight Chance Rain Showers near Thornton.
Stop Ideas Near Empire
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 Empire.
Fraser – Winter Park
Frisco, Colorado
Pine Junction, CO
Granby
Flight Path Map
This map shows the direct air route between Granby and Thornton. Straight-line distance: 53.39 mi (85.93 km).
#1 Granby
Statutory town in Grand County, Colorado, United States
| Population | 2,174 |
| Coordinates | 40.0861000, -105.9394600 |
| Altitude | 2428 |
| 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: 150 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 06m |
| 40 mph (64.37 km/h) | 02h 19m |
| 50 mph (80.47 km/h) | 01h 51m |
| 60 mph (96.56 km/h) | 01h 33m |
| 70 mph (112.65 km/h) | 01h 19m |
| 80 mph (129 km/h) | 01h 09m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $12.13 | $24.26 |
| Mid-grade | $4.08 | $13.40 | $26.79 |
| Premium | $4.39 | $14.40 | $28.80 |
| Diesel | $4.74 | $15.54 | $31.07 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.