Origin
Fremont, CA
Afternoon in Fremont on Sunday
Local time
2:49 PM
PDT
Current temp
48°F
Unavailable
Live forecast
Trip from Fremont, CA to Castaic, CA
Drive Time
5h 57m
Distance
316.2 mi
509 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$73
one way
EV Charging
Loading...
station data
Best Time to Leave
4 AM
5h 44m
★
6 AM
5h 57m
8 AM
6h 23m
10 AM
6h 6m
12 PM
6h 4m
3 PM
6h 8m
5 PM
6h 22m
8 PM
5h 49m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Trip Overview
Spanning 316.2 miles, this route from Fremont to Castaic is a straightforward journey typically taking 5 hours and 57 minutes. You will spend the vast majority of your time on the I-5 corridor, making this a highly efficient, highway-focused drive. Because the trip is manageable in a single day, it works well as a direct transit between these two Pacific Coast locations. You should budget approximately $73 for fuel to cover the distance comfortably. Whether you are traveling for business or a change of scenery, this path offers a reliable, no-nonsense connection through the heart of California.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
158.1 miles from Fremont, CA
A natural place for your longest stop of the day , about 3h 3m into the drive .
Drive Character
Expect a consistent highway experience, as 86% of your trip takes place on major thoroughfares like the Westside Freeway and the I-5 Truck route. You will encounter a significant, uninterrupted 181.1-mile stretch along the Westside Freeway, which defines the core of this drive. The road transitions through Pacheco Pass Highway before settling into the long, open stretches typical of the interstate. While the journey lacks the technical complexity of mountain passes or winding coastal roads, the steady pace makes for a predictable ride. Prepare for a high-speed, interstate-heavy environment that prioritizes time efficiency over winding backroads.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 18 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
Westside Freeway is the longest continuous segment at about 181.1 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on Westside Freeway and I 5 Truck. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 1.6 miles in.
Route Complexity
7/10
Demanding - plan breaks and stay ahead of the key maneuvers
This is a demanding drive. With 13 significant decision points across 316.2 miles, you will need to stay alert — especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 1.6 miles: Lane positioning matters here; at 15.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 270.3 miles (I 5 Truck): Highway fork - watch signs carefully. Lane positioning matters here.
Critical Maneuvers
5 of 13 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
6
1.6 mi into trip
|
~3m in
Take the ramp toward I 880 South: San Jose
Lane positioning matters here
Use the right lane.
Toward I 880 South: San Jose
7
15.2 mi into trip
|
~19m in
Take the exit toward US 101 South: Los Angeles
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / right lanes.
Toward US 101 South: Los Angeles
6
270.3 mi into trip
|
~5h 3m in
|
I 5 Truck
Keep slight right at fork onto I 5 Truck
Highway fork - watch signs carefully. Lane positioning matters here
Use the none / straight / slight right lanes.
6
315.5 mi into trip
|
~5h 55m in
|
The Old Road
Turn left onto The Old Road
Lane positioning matters here
Use the left lane.
7
316.2 mi into trip
|
~5h 57m in
|
Castaic Oak Lane
Turn left onto Castaic Oak Lane
Lane positioning matters here
Use the left lane.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Westside Freeway | 181.1 mi | 3h 14m |
| I 5 Truck | 44.9 mi | 51m |
| Pacheco Pass Highway | 40.6 mi | 50m |
| Bayshore Freeway | 32.3 mi | 37m |
| Nimitz Freeway | 13.3 mi | 15m |
| Mowry Avenue | 1.6 mi | 3m |
| The Old Road | 0.6 mi | 1m |
| CA 152 | 0.3 mi | <1m |
Longest stretch:
Westside Freeway
— 181.1 mi, about 3h 14m
Turn-by-Turn Driving Directions
Step-by-step road directions between Fremont, CA and Castaic, CA.
1
Start on Mowry Avenue
109 ft
·
4 sec
·
Mowry Avenue
2
Continue on Mowry Avenue
1.4 mi
·
3 min
·
Mowry Avenue
Use the left lane.
3
Continue on Mowry Avenue
0.2 mi
·
23 sec
·
Mowry Avenue
4
Take the ramp
0.3 mi
·
40 sec
Toward I 880 South: San Jose
Use the right lane.
5
Merge onto I 880
13 mi
·
15 min
·
Nimitz Freeway
Use the none / straight / slight right lanes.
6
Take the exit
0.1 mi
·
34 sec
Toward US 101 South: Los Angeles
Use the straight / right lanes.
7
Merge onto US 101
32 mi
·
37 min
·
Bayshore Freeway
Use the none / straight / right lanes.
8
Take the exit onto CA 152
0.3 mi
·
39 sec
·
CA 152
Toward CA 152 East: 10th Street, Pacheco Pass Road
9
Turn left onto CA 152
353 ft
·
12 sec
·
East 10th Street
10
Continue on CA 152
41 mi
·
50 min
·
Pacheco Pass Highway
Use the none lane.
11
Take the exit
0.6 mi
·
1 min
Toward I 5: Los Angeles
12
Merge onto I 5
181 mi
·
3 hr 14 min
·
Westside Freeway
Use the none / straight / slight right lanes.
13
Keep slight right at fork onto I 5 Truck
45 mi
·
51 min
·
I 5 Truck
Use the none / straight / slight right lanes.
14
Take the exit
0.2 mi
·
32 sec
Toward Castaic
15
Turn left onto The Old Road
0.6 mi
·
1 min
·
The Old Road
Use the left lane.
16
Turn right onto Parker Road
506 ft
·
19 sec
·
Parker Road
Use the none lane.
17
Turn left onto Castaic Oak Lane
63 ft
·
2 sec
·
Castaic Oak Lane
Use the left lane.
18
Arrive at destination
Castaic Oak Lane
Trip Plan
To keep your drive smooth, plan for at least one dedicated stop to break up the nearly six-hour duration. Leaving early in the morning is your best strategy to avoid mid-day traffic congestion and ensure you reach Castaic before the evening rush. Keep a close eye on your fuel gauge during the 181.1-mile segment on the Westside Freeway, as long stretches between service areas are common. Since this is a highway-heavy route, ensure your vehicle is prepped for sustained speeds. Use the flexibility of a one-day trip to your advantage by pacing your single stop based on your energy levels rather than a rigid schedule.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 158.1 miles from Fremont, CA, or about 3h 3m into the drive.
The longest continuous stretch on this route runs about 181.1 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 80 miles or 1h 37m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 158.1 miles or 3h 3m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 51m
Traffic, exits, and arrival timing usually matter more near Castaic, CA than in the middle of the route.
Before You Leave
+
Open the route before leaving Fremont, CA so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Fremont, CA
This is one driving day of about 316.2 miles and 5h 57m.
Your first comfortable stop window is around 80 miles from Fremont, CA.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on Westside Freeway for about 181.1 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 158.1 mi from Fremont, CA · 3h 3m into the drive
Mid-route town
Meal stop
158 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 80 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 158.1 miles from Fremont, CA, which is a good place for a longer meal and fuel stop.
Before the longest stretch
Fuel checkTop up before Westside Freeway if your tank is already low. That segment runs about 181.1 miles.
Arriving in Castaic, CA
The final approach into Castaic, CA usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Castaic, CA.
After long uninterrupted mileage, take five minutes before the last urban segment to reset and refocus on exits, merges, and city traffic.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$73.22 one way
$146.45 round trip
$5.88/gal
25.4 MPG avg
111 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $6.07 | $75.51 | $151.03 |
| premium | $6.24 | $77.72 | $155.44 |
| diesel | $5.64 | $70.25 | $140.50 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$73
Meals
$25–$50
Total
$98–$123
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 110.6 kg one way. Prices: EIA weekly data, 2026-04-06.
Driving Electric?
About $33 in charging · 1 stop · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 94.9 | 1 | $33.20 | $15.18 |
| Efficient EV | 79.1 | 0 | $27.67 | $12.65 |
| EV Truck/SUV | 126.5 | 1 | $44.27 | $20.24 |
Gas CO2
111 kg
EV CO2
37 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
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
Castaic, CA
Afternoon in Castaic on Sunday
Local time
2:49 PM
PDT
Current temp
78°F
Unavailable
Live forecast
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
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
30 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
5h 57m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Fremont, CA to Castaic, CA covers 316.2 miles and takes about 5h 57m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are Westside Freeway, I 5 Truck, Pacheco Pass Highway. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 158.1 miles from Fremont, CA. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $73.22 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
An early start around 7-8 AM gets you there with plenty of daylight left. A late afternoon start means arriving after dark. Morning is better.
Plan about 1 meaningful break for fuel, food, or rest. Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
This is a demanding drive. With 13 significant decision points across 316.2 miles, you will need to stay alert — especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
The main spots that need attention: at 1.6 miles: Lane positioning matters here; at 15.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 270.3 miles (I 5 Truck): Highway fork - watch signs carefully. Lane positioning matters here.
The route from Fremont, CA to Castaic, CA does not surface many named destination signs beyond the main corridor.
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