Gilroy to Fontana is 354.2 miles and takes about 6h 39m via Westside Freeway and Foothill Freeway, with a fuel budget near $80 and enough daylight to finish in a day. This one-day trip stays within California, starting in the Pacific Coast region and ending in the same region. It's a predominantly highway drive, making it a straightforward transit between the two points. Plan for a focused drive with minimal detours, ideal for getting from point A to point B efficiently.
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
177.1 miles from Gilroy, CA
A natural place for your longest stop of the day
, about 3h 17m into the drive
.
Main Roads
Road
Distance
Duration
Westside Freeway
181.1 mi
3h 14m
Foothill Freeway
67 mi
1h 17m
I 5 Truck
58.4 mi
1h 6m
Pacheco Pass Highway
40.6 mi
50m
Sierra Avenue
3 mi
4m
Golden State Freeway
2 mi
2m
East 10th Street
0.5 mi
<1m
Monterey Street
0.4 mi
<1m
Longest stretch:
Westside Freeway
— 181.1 mi, about 3h 14m
Traffic on I-5
Hour-of-day weekday pattern from 138 FHWA count stations on your route.
Peak
2 PM
~1,524 veh/hr typical
· worst 2,324
Quietest
2 AM
~316 veh/hr
Peak-to-quiet ratio
4.8×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 44 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Gilroy, CA and Fontana, CA.
1
Start on Monterey Street
0.4 mi·53 sec·Monterey Street
2
Turn left onto East 10th Street
0.3 mi·28 sec·East 10th Street
3
Continue on East 10th Street
0.2 mi·28 sec·East 10th Street
4
Continue on CA 152
41 mi·50 min·Pacheco Pass Highway
5
Take the exit
0.6 mi·1 min
Toward I 5: Los Angeles
6
Merge onto I 5
181 mi·3 hr 14 min·Westside Freeway
Use the straight / slight right lanes.
7
Keep slight right at fork onto I 5 Truck
58 mi·1 hr 6 min·I 5 Truck
Use the straight / slight right lanes.
8
Keep slight left at fork onto I 5
2.0 mi·2 min·Golden State Freeway
Use the straight / slight right lanes.
9
Take the exit
0.3 mi·17 sec
Exit 161AToward I 210 East: PasadenaUse the slight right lane.
10
Continue on I 210
24 mi·28 min·Foothill Freeway
Use the straight / slight right lanes.
11
Keep slight right at fork onto I 210
19 mi·22 min·Foothill Freeway
Toward CA 134 West, I 210 East: San Bernardino, VenturaUse the slight right lane.
12
Keep slight right at fork onto I 210
2.9 mi·3 min·Foothill Freeway
Use the straight / slight right lanes.
13
Keep slight right at fork onto CA 210
1.4 mi·1 min·Foothill Freeway
Use the straight / slight right lanes.
14
Keep slight right at fork onto CA 210
1.2 mi·1 min·Foothill Freeway
Use the straight / slight right lanes.
15
Keep slight right at fork onto CA 210
1.8 mi·2 min·Foothill Freeway
Use the straight / slight right lanes.
16
Keep slight right at fork onto CA 210
16 mi·18 min·Foothill Freeway
Use the straight / slight right lanes.
17
Take the exit
0.3 mi·46 sec
Exit 67Toward Sierra AvenueUse the straight / slight right lanes.
18
Turn right onto Sierra Avenue
3.0 mi·4 min·Sierra Avenue
Use the left / right lanes.
19
Turn left onto Merrill Avenue
205 ft·4 sec·Merrill Avenue
Use the left lane.
20
Arrive at destination
Merrill Avenue
Trip Plan
Given the 6h 39m estimated drive time, leaving Gilroy in the morning is your best bet to complete this trip before evening. With only one recommended stop, you have flexibility in pacing. Keep an eye on your fuel levels, especially as you approach the 181.1-mile mark on the Westside Freeway, as services can be spaced out. The $80 fuel estimate is helpful for budgeting. Since this is a single-day drive, you can afford to be a bit more flexible with your departure time if needed.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 177.1 miles from Gilroy, CA, or about 3h 17m 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 78 miles or 1h 31m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 177.1 miles or 3h 17m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 5h 28m
Traffic, exits, and arrival timing usually matter more near Fontana, CA than in the middle of the route.
Before You Leave
+
Open the route before leaving Gilroy, 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 Gilroy, CA
This is one driving day of about 354.2 miles and 6h 39m.
Your first comfortable stop window is around 78 miles from Gilroy, 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.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 15
5 decision points cluster between mile 223.3 and 350.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
223.3 mi into trip|~4h 7m in|I 5 Truck
Keep slight right at fork onto I 5 Truck
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
6
281.6 mi into trip|~5h 14m in|I 5 / Golden State Freeway
Keep slight left at fork onto I 5 / Golden State Freeway
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
7
283.6 mi into trip|~5h 16m in
Take the exit toward I 210 East: Pasadena
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 161A
Toward I 210 East: Pasadena
8
308.3 mi into trip|~5h 45m in|I 210 / Foothill Freeway
Keep slight right at fork onto I 210 / Foothill Freeway toward CA 134 West, I 210 East: San Bernardino, Ventura
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Toward CA 134 West, I 210 East: San Bernardino,...
7
350.8 mi into trip|~6h 33m in
Take the exit toward Sierra Avenue
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight right lanes.
Exit 67
Toward Sierra Avenue
Fuel & Cost
Regular Gas
$74.10 one way
$148.21 round trip
$5.31/gal25.4 MPG avg124 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$5.52
$76.96
$153.92
premium
$5.67
$79.00
$158.00
diesel
$4.80
$66.88
$133.76
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$74
Meals
$25–$50
Total
$99–$124
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 123.9 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $37 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
106.3
1
$37.19
$17.00
Efficient EV
88.6
1
$30.99
$14.17
EV Truck/SUV
141.7
1
$49.59
$22.67
Gas CO2
124 kg
EV CO2
41 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.
Forecast as of Jul 17, 2026
Origin
Gilroy, CA
Evening
in Gilroy on Monday
Local time
5:55 PM
PDT
Current temp
54°F
Mostly Clear
SE 1 mph0% chanceLive forecast
Red Flag Warning
Red Flag Warning issued July 17 at 1:44AM PDT until July 17 at 8:00PM PDT by NWS Medford OR
Red Flag Warning
Red Flag Warning issued July 17 at 1:44AM PDT until July 17 at 8:00PM PDT by NWS Medford OR
Destination
Fontana, CA
Evening
in Fontana on Monday
Local time
5:55 PM
PDT
Current temp
71°F
Mostly Clear
0 mph3% chanceLive forecast
Red Flag Warning
Red Flag Warning issued July 17 at 1:44AM PDT until July 17 at 8:00PM PDT by NWS Medford OR
Red Flag Warning
Red Flag Warning issued July 17 at 1:44AM PDT until July 17 at 8:00PM PDT by NWS Medford OR
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
17 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
6h 39m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Santa Monica Mountains National Recreation Area
National Recreation Area
The Santa Monica Mountains offer easy access to surprisingly wild places. Experience the famous beaches of Malibu or explore more than 500 miles of trails. The park abounds with historical and cultura...
22 mi from route
~55 min detour
Free
near mile 280.9
Yes, we can! Widely recognized as the most important Latino leader in the United States during the twentieth century, Cesar Chavez led farm workers and supporters in the establishment of the country's...
27 mi from route
~68 min detour
Free
near mile 219.8
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route is 87% highway, so expect to be on major freeways for most of the 354.2 miles. You'll encounter 181.1 miles on the Westside Freeway, which is the longest continuous stretch. After that, you'll transition to the Foothill Freeway and I 5 Truck. Be prepared for a high volume of exits and entrances as you navigate through populated areas.
87% highway — fuel and pacing are the main things to plan.
20 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 181.1 mi on Westside Freeway.
How Hard Is This Drive?
8/10
This is a straightforward highway drive that stays mostly on Westside Freeway and Foothill Freeway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 223.3 miles in near I 5 Truck.
Driving Effort8/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 15 significant decision points across 354.2 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 223.3 miles (I 5 Truck): Highway fork - watch signs carefully. Lane positioning matters here; at 281.6 miles (I 5 / Golden State Freeway): Highway fork - watch signs carefully. Lane positioning matters here; at 283.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Elevation Profile
Hilly terrain with moderate elevation changes
2,748 ft199 ft
Total Climb
4,261 ft
Total Descent
3,225 ft
Highest Point
2,748 ft
~253 mi in
Elevation Range
2,549 ft
Notable High Points
1,332 ft at ~25.3 miles+1,053 ft prominence
2,748 ft at ~253 miles+1,366 ft prominence
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Gilroy, CA to Fontana, CA, road signs begin pointing toward Ventura along the way.
Gilroy is in the southern part of Santa Clara County south of San Jose in California. It is in the South Bay region of the San Francisco Bay Area.
Almost halfway between San Jose and Monterey, Gilroy can make a less-expensive central home base for travelers who need to go up to Silicon Valley and also want to explore the Pacific Ocean or visit Pinnacles National Park.
Top landmarks
•Gilroy Free Library — library
•Gilroy station — railway station in Gilroy, California, USA
•Edgar Holloway House — historic house in California, United States
Doable as a same-day drive at 6h 39m. Total distance: 354.2 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
6h 39m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 181.1 miles on Westside Freeway. The full list of main roads is in the Roads section above.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Fontana, CA before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: at 223.3 miles (I 5 Truck): Highway fork - watch signs carefully. Lane positioning matters here; at 281.6 miles (I 5 / Golden State Freeway): Highway fork - watch signs carefully. Lane positioning matters here; at 283.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Yes — Santa Monica Mountains National Recreation Area and César E. Chávez National Monument. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 6.7 hours each way, a round trip means 13.3 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Fontana, CA before the return drive.
