Origin
Brentwood, CA
Evening in Brentwood on Friday
Local time
8:48 PM
PDT
Current temp
--
Unavailable
Trip from Brentwood, CA to Diamond, CA
Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 18, 2026 · Editorial standards
Drive Time
21m
Distance
15 mi
24 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$3
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 20m
★
6 AM
0h 22m
8 AM
0h 26m
10 AM
0h 23m
12 PM
0h 23m
3 PM
0h 23m
5 PM
0h 25m
8 PM
0h 21m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Brentwood, CA
Wikimedia Commons
Trip Overview
The drive from Brentwood, CA to Diamond, CA covers 15 miles and takes about 21m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on CA 4, Sand Creek Road, O'Hara Avenue for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 10.2 miles on CA 4. At current regular gas prices, budget about $3.45 one way before food or hotel costs.
About the Cities
Starting in Brentwood, CA
Full guide →Brentwood is an affluent, suburban city in eastern Contra Costa County, California with a popular downtown for visitors coming from the Sacramento Valley to the county. It serves as one of the eastern gateways to the East Bay, along with Livermore. Many in the city are commuters.
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 21m. Total distance: 15 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
21m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (68%). Some complex stretches to watch for.
Drive Character
This is a 21m highway drive covering 15 miles, with most of the trip on CA 4 and Sand Creek Road. The longest continuous stretch is about 10.2 miles on CA 4.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 13 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
CA 4 is the longest continuous segment at about 10.2 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on CA 4 and Sand Creek Road. You will hit about 7 points where you need to pay attention to lane position or signs. The trickiest moment comes around 3.2 miles in.
Driving Effort
5/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 15 miles you will encounter 7 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 3.2 miles: Lane positioning matters here; at 13.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 14 miles (California Avenue): Lane positioning matters here.
Critical Maneuvers
5 of 7 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
6
3.2 mi into trip
|
~6m in
Take the ramp toward CA 4 West: Martinez
Lane positioning matters here
Use the straight / right lanes.
Toward CA 4 West: Martinez
8
13.6 mi into trip
|
~18m in
Take the exit toward Railroad Avenue, Harbor Street
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 23
Toward Railroad Avenue, Harbor Street
6
14 mi into trip
|
~19m in
|
California Avenue
Turn left onto California Avenue
Lane positioning matters here
Use the left / straight lanes.
6
14.4 mi into trip
|
~20m in
|
Railroad Avenue
Turn right onto Railroad Avenue
Lane positioning matters here
Use the straight / right lanes.
7
14.7 mi into trip
|
~20m in
|
Civic Avenue
Turn left onto Civic Avenue
Lane positioning matters here
Use the left lane.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| CA 4 | 10.2 mi | 11m |
| Sand Creek Road | 2 mi | 3m |
| O'Hara Avenue | 0.5 mi | 1m |
| California Avenue | 0.5 mi | <1m |
| Brentwood Boulevard | 0.4 mi | <1m |
| Civic Avenue | 0.3 mi | <1m |
| Railroad Avenue | 0.2 mi | <1m |
| 2nd Street | 0.2 mi | <1m |
Longest stretch:
CA 4
— 10.2 mi, about 11m
Turn-by-Turn Driving Directions
Step-by-step road directions between Brentwood, CA and Diamond, CA.
1
Start on Brentwood Boulevard
0.4 mi
·
42 sec
·
Brentwood Boulevard
2
Turn left onto 2nd Street
0.2 mi
·
34 sec
·
2nd Street
3
Continue on Second Street
0.1 mi
·
18 sec
·
Second Street
4
Continue on O'Hara Avenue
0.5 mi
·
1 min
·
O'Hara Avenue
5
Turn left onto Sand Creek Road
2.0 mi
·
3 min
·
Sand Creek Road
6
Take the ramp
0.2 mi
·
33 sec
Toward CA 4 West: Martinez
Use the straight / right lanes.
7
Merge onto CA 4
10 mi
·
11 min
·
CA 4
Use the straight / slight right lanes.
8
Take the exit
0.4 mi
·
31 sec
Exit 23
Toward Railroad Avenue, Harbor Street
Use the slight right lane.
9
Turn left onto California Avenue
0.5 mi
·
49 sec
·
California Avenue
Use the left / straight lanes.
10
Turn right onto Railroad Avenue
0.2 mi
·
35 sec
·
Railroad Avenue
Use the straight / right lanes.
11
Turn left onto Civic Avenue
0.3 mi
·
54 sec
·
Civic Avenue
Use the left lane.
12
Turn left onto Dimaggio Avenue
97 ft
·
4 sec
·
Dimaggio Avenue
13
Arrive at destination
Dimaggio Avenue
Fuel & Cost
Regular Gas
$3.45 one way
$6.90 round trip
$5.84/gal
25.4 MPG avg
5 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $6.02 | $3.55 | $7.11 |
| premium | $6.18 | $3.65 | $7.30 |
| diesel | $5.61 | $3.31 | $6.62 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$3
Estimated CO2 emission: 5.2 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 | 4.5 | 0 | $1.58 | $0.72 |
| Efficient EV | 3.8 | 0 | $1.31 | $0.60 |
| EV Truck/SUV | 6 | 0 | $2.10 | $0.96 |
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.
Destination
Diamond, CA
Evening in Diamond on Friday
Local time
8:48 PM
PDT
Current temp
--
Unavailable
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Road read
21m 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 Brentwood, CA to Diamond, CA covers 15 miles and takes about 21m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are CA 4, Sand Creek Road, O'Hara Avenue. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 7.5 miles from Brentwood, CA. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $3.45 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.
This drive requires moderate attention. Across 15 miles you will encounter 7 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
The main spots that need attention: at 3.2 miles: Lane positioning matters here; at 13.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 14 miles (California Avenue): Lane positioning matters here.
The route from Brentwood, CA to Diamond, CA does not surface many named destination signs beyond the main corridor.
Yes. Nearby national parks include Port Chicago Naval Magazine National Memorial and Rosie the Riveter WWII Home Front National Historical Park.
How this page is built
Compiled by the Trip.ovh 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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