How far is Thornton, CO from Lyons, CO?
The driving distance from Thornton, CO to Lyons, CO is about 40.1 miles (64.5 km), with a travel time of about 00h 54m by car.
- The straight-line flight distance is about 29.3 miles (47.1 km).
- For a round trip, plan for roughly 01h 49m 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 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.
Human settlement in Weld County, Colorado, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Snow Showers
Slight Chance Snow Showers
Driving Route Map
The map below follows the saved road route between Thornton and Lyons.
Turn-by-Turn Driving Directions
Step-by-step road directions between Thornton and Lyons.
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1
Start on the route
23 m · 12 sec
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2
Turn left onto Dorothy Boulevard
1165 ft · 59 sec · Dorothy Boulevard
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3
At the end of the road, turn left onto Thornton Parkway
1755 ft · 44 sec · Thornton Parkway
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4
Turn right onto Washington Street
1.6 km · 2 min · Washington Street
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5
Turn left onto East 104th Avenue
2512 ft · 57 sec · East 104th Avenue
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6
Take the ramp slight right toward I 25 North
1401 ft · 26 sec
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7
Merge slight left onto North Valley Highway
1.1 mi · 1 min · North Valley Highway
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8
Keep slight right to continue on North Valley Highway
5.3 mi · 6 min · North Valley Highway
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9
Continue on Dwight D. Eisenhower Highway
15.1 mi · 15 min · Dwight D. Eisenhower Highway
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10
Take the exit slight right toward CO 66: Lyons, Longmont
1898 ft · 54 sec
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11
Turn left
2 mi · 3 min
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12
Continue straight
13.5 mi · 22 min
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13
Continue on Main Street
2514 ft · 1 min · Main Street
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14
Continue on West Main Street
9 m · 1 sec · West Main Street
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15
Arrive at your destination
0 m · 1 sec · West Main Street
Car Route Details
A richer read on the saved driving route between Thornton and Lyons.
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
Continue on Dwight D. Eisenhower Highway
15.1 mi · 00h 15m
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.
Slight Chance Snow Showers leaving Thornton and Slight Chance Snow Showers near Lyons.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Thornton to Lyons?
The road trip is about 40.1 miles (64.5 km) and usually takes 00h 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?
Firestone is a useful midpoint, sitting about 20.1 miles from Thornton and 20.1 miles from Lyons.
How much longer is the road route than the straight-line distance?
The direct path is about 29.3 miles (47.1 km), while the road route adds roughly 10.8 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 4:40 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $5.25 one way or $10.50 round trip. Estimated CO2 is about 12.6 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Snow Showers around Thornton and Slight Chance Snow Showers near Lyons.
Stop Ideas Near Firestone
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Historic Brighton City Hall
Town of Frederick
Lafayette City Hall
Old Town Hall
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Firestone.
Longmont, Colorado
Boulder, Colorado
Union Station
Denver (Bus Station), Colorado
Flight Path Map
This map shows the direct air route between Thornton and Lyons. Straight-line distance: 29.3 mi (47.15 km).
#1 Thornton
The seventh most populous city in Colorado.
| Population | 148,113 |
| Coordinates | 39.8680400, -104.9719200 |
| Altitude | 1631 |
| Country | United States |
#2 Lyons
Town in Boulder County, Colorado, United States
| Population | 2,058 |
| Coordinates | 40.2247100, -105.2713800 |
| Altitude | 1637 |
| Country | United States |
End: Lyons (-105.27138, 40.22471)
Estimated Travel Time
Distance: 65 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 20m |
| 40 mph (64.37 km/h) | 01h 00m |
| 50 mph (80.47 km/h) | 00h 48m |
| 60 mph (96.56 km/h) | 00h 40m |
| 70 mph (112.65 km/h) | 00h 34m |
| 80 mph (129 km/h) | 00h 30m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $5.25 | $10.50 |
| Mid-grade | $4.08 | $5.80 | $11.60 |
| Premium | $4.39 | $6.24 | $12.47 |
| Diesel | $4.74 | $6.73 | $13.45 |
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.