Origin
Castlewood, CO
Morning in Castlewood on Thursday
Local time
10:56 AM
MDT
Current temp
77°F
Unavailable
Live forecast
Trip from Castlewood, CO to Boulder, CO
Last recalculated Apr 16, 2026
Drive Time
54m
Distance
43 mi
69 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$6
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 50m
★
6 AM
0h 54m
8 AM
1h 3m
10 AM
0h 57m
12 PM
0h 56m
3 PM
0h 58m
5 PM
1h 2m
8 PM
0h 51m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Castlewood, CO
Liudmyla Shalimova
Boulder, CO
Wikimedia Commons
Trip Overview
The drive from Castlewood, CO to Boulder, CO covers 43 miles and takes about 54m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on East Hinsdale Avenue, South Quebec Street, East Arapahoe Road for much of the mileage, and the overall profile is turn-heavy local drive. At current regular gas prices, budget about $6.48 one way before food or hotel costs.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 54m. Total distance: 43 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
54m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (0%). Straightforward navigation.
Scenic Drive
Turn-heavy local drive route profile.
Drive Character
Expect a 54m drive with frequent turns across 43 miles of local and secondary roads.
This route has more turning and local-road decision points than a simple highway run.
There are about 21 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
East Hinsdale Avenue is one of the defining roads on this drive.
How Hard Is This Drive?
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. Navigation is very simple - set it and forget it for most of the drive.
Driving Effort
1/10
Very easy - short and simple to drive
Balances navigation complexity with total wheel time.
The drive from Castlewood, CO to Boulder, CO is easy. At 54m with 0% highway, most drivers will find it relaxed and low-stress.
Where does it get tricky?
This route does not have any notably tricky sections. Most of the drive from Castlewood, CO to Boulder, CO is straightforward, with well-signed roads and simple exits.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| East Hinsdale Avenue | — | — |
| South Quebec Street | — | — |
| East Arapahoe Road | — | — |
| I 25 North | — | — |
| South Valley Highway | — | — |
| US 36 West | — | — |
| Denver–Boulder Turnpike | — | — |
| 28th Street | — | — |
Some road-level metrics are being recalculated.
Longest stretch:
East Hinsdale Avenue
— detailed segment metrics are refreshing.
Turn-by-Turn Driving Directions
Step-by-step road directions between Castlewood, CO and Boulder, CO.
1
Start on East Fremont Drive
0.1 mi
·
33 sec
·
East Fremont Drive
2
Turn right onto East Hinsdale Avenue
495 ft
·
24 sec
·
East Hinsdale Avenue
3
At the end of the road, turn right onto South Quebec Street
0.8 mi
·
1 min
·
South Quebec Street
4
Turn right onto East Arapahoe Road
1.1 mi
·
1 min
·
East Arapahoe Road
5
Take the ramp straight toward I 25 North: Denver
0.2 mi
·
23 sec
·
I 25 North: Denver
6
Merge slight left onto South Valley Highway
19 mi
·
24 min
·
South Valley Highway
7
Take the exit slight left toward US 36 West: Westminster, Boulder
0.6 mi
·
52 sec
·
US 36 West: Westminster, Boulder
8
Merge slight right onto Denver–Boulder Turnpike
2.1 mi
·
2 min
·
Denver–Boulder Turnpike
9
Keep slight right to continue on Denver–Boulder Turnpike
1.7 mi
·
1 min
·
Denver–Boulder Turnpike
10
Keep slight right to continue on Denver–Boulder Turnpike
2.3 mi
·
2 min
·
Denver–Boulder Turnpike
11
Keep slight right to continue on Denver–Boulder Turnpike
1.9 mi
·
2 min
·
Denver–Boulder Turnpike
12
Keep slight right to continue on Denver–Boulder Turnpike
2.1 mi
·
2 min
·
Denver–Boulder Turnpike
13
Keep slight right to continue on Denver–Boulder Turnpike
2.9 mi
·
3 min
·
Denver–Boulder Turnpike
14
Keep slight right to continue on Denver–Boulder Turnpike
2.4 mi
·
2 min
·
Denver–Boulder Turnpike
15
Keep slight right to continue on Denver–Boulder Turnpike
2.2 mi
·
2 min
·
Denver–Boulder Turnpike
16
Keep slight left to continue on Denver–Boulder Turnpike
2.3 mi
·
2 min
·
Denver–Boulder Turnpike
17
Continue on 28th Street
0.8 mi
·
1 min
·
28th Street
18
Turn left onto Arapahoe Avenue
0.6 mi
·
1 min
·
Arapahoe Avenue
19
Turn right onto 19th Street
144 ft
·
11 sec
·
19th Street
20
Turn left
89 ft
·
5 sec
21
Arrive at your destination
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 21.5 mi from Castlewood, CO · 27m into the drive
Mid-route town
Meal stop
22 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
Pacing Suggestions
Fuel and coffee
A short stop after about 43 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 21.5 miles from Castlewood, CO, which is a good place for a longer meal and fuel stop.
Arriving in Boulder, CO
Allow a few extra minutes for the final approach into Boulder, CO if you are unfamiliar with the area.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$6.48 one way
$12.96 round trip
$3.83/gal
25.4 MPG avg
15 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.05 | $6.86 | $13.72 |
| premium | $4.39 | $7.44 | $14.88 |
| diesel | $5.61 | $9.49 | $18.99 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$6
Estimated CO2 emission: 15 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $5 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 12.9 | 0 | $4.52 | $2.06 |
| Efficient EV | 10.8 | 0 | $3.76 | $1.72 |
| EV Truck/SUV | 17.2 | 0 | $6.02 | $2.75 |
Gas CO2
15 kg
EV CO2
5 kg (67% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Destination
Boulder, CO
Morning in Boulder on Thursday
Local time
10:56 AM
MDT
Current temp
72°F
Unavailable
Live forecast
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
5 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
54m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Castlewood, CO to Boulder, CO covers 43 miles and takes about 54m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are East Hinsdale Avenue, South Quebec Street, East Arapahoe Road. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 21.5 miles from Castlewood, CO. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $6.48 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
The drive from Castlewood, CO to Boulder, CO is easy. At 54m with 0% highway, most drivers will find it relaxed and low-stress.
This route does not have any notably tricky sections. Most of the drive from Castlewood, CO to Boulder, CO is straightforward, with well-signed roads and simple exits.
The route from Castlewood, CO to Boulder, CO does not surface many named destination signs beyond the main corridor.
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