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Trip from Castro Valley, CA to Fremont, CA

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Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 21, 2026 · Editorial standards

Drive Time

23m

Distance

15.5 mi

25 km

Drive Score

8/10

Great drive

Same Day?

Yes, doable

Fuel Cost

$4

one way

EV Charging

Unknown

Best Time to Leave

Save up to 6 min
4 AM
0h 21m ★
6 AM
0h 23m
8 AM
0h 27m
10 AM
0h 24m
12 PM
0h 24m
3 PM
0h 25m
5 PM
0h 27m
8 PM
0h 22m

Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.

Best Time Drive vs Fly
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census-designated place in Alameda County, California, United States

Castro Valley, CA

Wikimedia Commons

Trip Overview

Castro Valley to Fremont is 15.5 miles and takes about 23 minutes via I 880, with a fuel budget near $4 and enough daylight to finish in a day. This short trip stays within the Pacific Coast region, offering a straightforward connection between two communities in California. Given its brief distance and duration, it’s an ideal option for a quick errand, a short commute, or an easy addition to a larger regional exploration. You won't need to pack an overnight bag for this one; it's designed for a single-day journey.

Main Roads

Road Distance Duration
I 880 8 mi 8m
Jackson Street 1.7 mi 3m
Mowry Avenue 1.6 mi 3m
Foothill Boulevard 1.2 mi 2m
Nimitz Freeway 1.2 mi 1m
Castro Valley Boulevard 0.7 mi 1m
Mission Boulevard 0.3 mi <1m
A Street 0.2 mi <1m
Longest stretch: I 880 — 8 mi, about 8m

Turn-by-Turn Driving Directions

Step-by-step road directions between Castro Valley, CA and Fremont, CA.

1

Start on Lake Chabot Road

60 ft · 4 sec · Lake Chabot Road
2

Turn left onto Castro Valley Boulevard

0.7 mi · 1 min · Castro Valley Boulevard
3

Turn left onto CA 238

1.2 mi · 2 min · Foothill Boulevard
Use the left lane.
4

At end of road, turn right onto A Street

0.2 mi · 34 sec · A Street
Use the right lane.
5

Turn left onto Mission Boulevard

0.3 mi · 44 sec · Mission Boulevard
Use the left lane.
6

Turn slight right onto CA 92

1.7 mi · 3 min · Jackson Street
Use the right lane.
7

Take the exit

0.4 mi · 27 sec
Exit 26A Toward I 880 South: San Jose Use the slight right lane.
8

Merge onto I 880

1.2 mi · 1 min · Nimitz Freeway
9

Keep slight left at fork onto I 880

2.4 mi · 2 min · I 880
Use the slight left lane.
10

Keep slight left at fork onto I 880

5.6 mi · 6 min · I 880
Use the slight left lane.
11

Take the exit

0.3 mi · 35 sec
Exit 17 Toward Mowry Avenue, Central Fremont Use the straight / slight right lanes.
12

Turn left

116 ft · 3 sec
Use the left lane.
13

Turn straight onto Mowry Avenue

0.1 mi · 10 sec · Mowry Avenue
14

Continue on Mowry Avenue

1.5 mi · 2 min · Mowry Avenue
15

Arrive at destination

Mowry Avenue

Heads-up: tricky spots

5 of 10

5 decision points cluster between mile 0.7 and 13.6 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.

6
0.7 mi into trip | ~1m in | CA 238 / Foothill Boulevard

Turn left onto CA 238 / Foothill Boulevard

Lane positioning matters here

Use the left lane.
6
1.9 mi into trip | ~3m in | A Street

At end of road, turn right onto A Street

Lane positioning matters here

Use the right lane.
6
2.1 mi into trip | ~4m in | Mission Boulevard

Turn left onto Mission Boulevard

Lane positioning matters here

Use the left lane.
7
4.1 mi into trip | ~8m in

Take the exit toward I 880 South: San Jose

Exit ramp - move to the correct lane early. Lane positioning matters here

Use the slight right lane. Exit 26A Toward I 880 South: San Jose
8
13.6 mi into trip | ~19m in

Take the exit toward Mowry Avenue, Central Fremont

Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one

Use the straight / slight right lanes. Exit 17 Toward Mowry Avenue, Central Fremont

Fuel & Cost

Regular Gas

$3.56 one way

$7.13 round trip

$5.84/gal 25.4 MPG avg 5 kg CO2
Fuel Type $/gal One Way Round Trip
midgrade $6.02 $3.67 $7.34
premium $6.18 $3.77 $7.54
diesel $5.61 $3.42 $6.84

No toll roads detected on this route.

Drive Cost (one way)

Fuel

$4

Estimated CO2 emission: 5.4 kg one way. Prices: EIA weekly data, 2026-04-13.

Driving Electric?

About $2 in charging · 0 stops · 60% less CO2

Vehicle Type kWh Stops DC Fast Home Charge
Average EV 4.6 0 $1.63 $0.74
Efficient EV 3.9 0 $1.36 $0.62
EV Truck/SUV 6.2 0 $2.17 $0.99

Gas CO2

5 kg

EV CO2

2 kg (60% 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.

Forecast as of Apr 17, 2026

Origin

Castro Valley, CA

Late night in Castro Valley on Tuesday

Local time

2:12 AM

PDT

Current temp

73°F

Sunny

NNW 3 to 7 mph 0% chance Live forecast

Wind Advisory

Wind Advisory issued April 17 at 5:29AM PDT until April 17 at 2:00PM PDT by NWS Los Angeles/Oxnard CA

Wind Advisory

Wind Advisory issued April 17 at 5:29AM PDT until April 17 at 2:00PM PDT by NWS Los Angeles/Oxnard CA

Destination

Fremont, CA

Late night in Fremont on Tuesday

Local time

2:12 AM

PDT

Current temp

49°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

24 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

23m on the road

The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.

Weather data from the National Weather Service. Conditions may change; check closer to your travel date.

What kind of drive is this?

This drive is a mixed bag, with 59% of the journey taking place on the interstate. You'll spend a significant portion on I 880, experiencing its typical highway flow for up to 8 miles at a time. As you approach Fremont, the route transitions, incorporating local roads like Jackson Street and Mowry Avenue. Expect a blend of faster highway travel and more measured, signal-controlled city driving.

59% highway, the rest on surface roads — varied driving throughout.
15 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 8 mi on I 880.

How Hard Is This Drive?

8/10

This route mixes highway mileage with some local-road sections near the start or finish. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.7 miles in near CA 238 / Foothill Boulevard.

Driving Effort 8/10

Focused - busy navigation packed into a short drive

Balances navigation complexity with total wheel time.

This is a short but busy drive. With 10 decision points packed into just 15.5 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 23m.

Where does it get tricky?

The main spots that need attention: at 0.7 miles (CA 238 / Foothill Boulevard): Lane positioning matters here; at 1.9 miles (A Street): Lane positioning matters here; at 2.1 miles (Mission Boulevard): Lane positioning matters here.

About the Cities

Starting in Castro Valley, CA

Full guide →

Castro Valley is an unincorporated town in the inner East Bay in the Bay Area of California. It has a population of about 60,000 and is located north of Hayward and east of San Leandro and south of the Oakland hills. Since it is unincorporated, Castro Valley is governed by the County of Alameda, which has its county seat in Oakland.

Arriving in Fremont, CA

Full guide →

Founded 1956

Fremont is a suburban city in the southern part of the East Bay of the San Francisco Bay Area; it is the 4th largest city in the Bay Area by population. Fremont is in the southern part of Alameda County, California, between Union City to the north, Sunol and the hills to the east, Milpitas and Santa Clara County to the south, and the San Francisco Bay to the west. The city of Newark, near the edge of the Bay, is surrounded by the city of Fremont. Fremont industry is not particularly large relative to other parts of the Bay Area, but neither is it a bedroom community. Many people in Fremont work locally in the electronics and high-tech industry, while many others commute to Silicon Valley or San Francisco locations for work.

Top landmarks

  • • Mission San José — 18th-century Spanish mission in Fremont, California
  • • Ardenwood Historic Farm — human settlement in California, United States of America
  • • Niles Depot Museum — railway museum in Niles, California

City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).

Who Is This Route For?

Weekend Trip

Doable as a same-day drive at 23m. Total distance: 15.5 miles.

Family Friendly

Moderate complexity with 0 natural rest stops along the way.

Solo Traveler

23m drive, comfortable solo distance.

EV Driver

0 DC fast chargers along the route. Coverage: unknown.

First-Time Driver

Mostly highway driving (59%). Some complex stretches to watch for.

Scenic Drive

Mixed highway & surface route profile with national parks nearby.

Frequently Asked Questions

The longest stretch is about 8 miles on I 880. The full list of main roads is in the Roads section above.

Yes — we found about 1 rest area or service plaza within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.

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 Fremont, CA before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.

Yes. At under 2 hours behind the wheel, this works well for families — plan one quick stop if you have younger kids.

The main spots that need attention: at 0.7 miles (CA 238 / Foothill Boulevard): Lane positioning matters here; at 1.9 miles (A Street): Lane positioning matters here; at 2.1 miles (Mission Boulevard): Lane positioning matters here.

Yes — San Francisco Maritime National Historical Park, Rosie the Riveter WWII Home Front National Historical Park and Port Chicago Naval Magazine National Memorial. See the National Parks section for detour distances and tips on detours.

Yes. A round trip is manageable in a single day if you plan a break at Fremont, CA before heading back.

How this page is built

Compiled by the US Trip Planner planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.

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