Origin
Diamond, CA
Late night in Diamond on Saturday
Local time
1:57 AM
PDT
Current temp
--
Unavailable
Trip from Diamond, CA to San Ramon, CA
Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 18, 2026 · Editorial standards
Drive Time
33m
Distance
27.5 mi
44 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$6
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 31m
★
6 AM
0h 33m
8 AM
0h 39m
10 AM
0h 35m
12 PM
0h 35m
3 PM
0h 36m
5 PM
0h 39m
8 PM
0h 32m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
San Ramon, CA
Wikimedia Commons
Trip Overview
The drive from Diamond, CA to San Ramon, CA covers 27.5 miles and takes about 33m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on Donald D Doyle Highway, CA 4, Senator Daniel E Boatwright Highway for much of the mileage, and the overall profile is mixed drive. The longest uninterrupted segment is about 9.2 miles on Donald D Doyle Highway. At current regular gas prices, budget about $6.32 one way before food or hotel costs.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 33m. Total distance: 27.5 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
33m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (42%). Some complex stretches to watch for.
Scenic Drive
Mixed drive route profile with national parks nearby.
Drive Character
The drive from Diamond, CA to San Ramon, CA covers 27.5 miles and takes about 33m, using a mix of highways and local roads.
Expect a mix of faster highway mileage and slower local approaches near the beginning or end.
There are about 15 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
Donald D Doyle Highway is the longest continuous segment at about 9.2 miles.
Elevation Profile
Mostly flat terrain
493 ft
44 ft
Total Climb
776 ft
Total Descent
327 ft
Highest Point
493 ft
~27.5 mi in
Elevation Range
449 ft
How Hard Is This Drive?
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 8 miles in near CA 242.
Driving Effort
9/10
Focused - lots of decisions in a short distance, but it is over quickly
Balances navigation complexity with total wheel time.
This is a short but busy drive. With 10 decision points packed into just 27.5 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 33m.
Where does it get tricky?
The main spots that need attention: at 8 miles (CA 242): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 18.8 miles (I 680 / Donald D Doyle Highway): Highway fork - watch signs carefully. Lane positioning matters here; at 26.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Critical Maneuvers
5 of 10 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
8
8 mi into trip
|
~10m in
|
CA 242
Keep slight right at fork onto CA 242 toward CA 242: Oakland, Concord
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Toward CA 242: Oakland, Concord
6
18.8 mi into trip
|
~22m in
|
I 680 / Donald D Doyle Highway
Keep slight right at fork onto I 680 / Donald D Doyle Highway
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
7
26.6 mi into trip
|
~31m in
Take the exit toward Crow Canyon Road
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 36
Toward Crow Canyon Road
7
26.9 mi into trip
|
~31m in
|
Crow Canyon Road
Turn right onto Crow Canyon Road
Lane positioning matters here
Use the right lane.
6
27 mi into trip
|
~32m in
|
San Ramon Valley Boulevard
Turn right onto San Ramon Valley Boulevard
Lane positioning matters here
Use the right lane.
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 Diamond, CA to San Ramon, CA, road signs begin pointing toward Concord along the way.
Concord
8 mi in
|
~10m
|
via CA 242
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Donald D Doyle Highway | 9.2 mi | 10m |
| CA 4 | 7.1 mi | 8m |
| Senator Daniel E Boatwright Highway | 4.8 mi | 5m |
| CA 242 | 4.6 mi | 4m |
| San Ramon Valley Boulevard | 0.4 mi | 1m |
| Civic Avenue | 0.2 mi | <1m |
| Railroad Avenue | 0.2 mi | <1m |
| Crow Canyon Road | <0.1 mi | <1m |
Longest stretch:
Donald D Doyle Highway
— 9.2 mi, about 10m
Turn-by-Turn Driving Directions
Step-by-step road directions between Diamond, CA and San Ramon, CA.
1
Start on Dimaggio Avenue
97 ft
·
6 sec
·
Dimaggio Avenue
2
Turn right onto West 17th Street
260 ft
·
11 sec
·
West 17th Street
3
Continue on Civic Avenue
0.2 mi
·
37 sec
·
Civic Avenue
4
Turn right onto Railroad Avenue
0.2 mi
·
21 sec
·
Railroad Avenue
5
Take the ramp
0.5 mi
·
35 sec
Toward CA 4 West: Hercules
Use the right lane.
6
Merge onto CA 4
7.1 mi
·
8 min
·
CA 4
Use the straight / slight right lanes.
7
Keep slight right at fork onto CA 242
4.6 mi
·
4 min
·
CA 242
Toward CA 242: Oakland, Concord
Use the slight right lane.
8
Merge onto I 680
4.8 mi
·
5 min
·
Senator Daniel E Boatwright Highway
Use the straight / slight right lanes.
9
Continue on I 680
1.4 mi
·
1 min
·
Donald D Doyle Highway
10
Keep slight right at fork onto I 680
7.9 mi
·
9 min
·
Donald D Doyle Highway
Use the straight / slight right lanes.
11
Take the exit
0.3 mi
·
38 sec
Exit 36
Toward Crow Canyon Road
Use the slight right lane.
12
Turn right onto Crow Canyon Road
499 ft
·
14 sec
·
Crow Canyon Road
Use the right lane.
13
Turn right onto San Ramon Valley Boulevard
0.4 mi
·
1 min
·
San Ramon Valley Boulevard
Use the right lane.
14
Continue on San Ramon Valley Boulevard
364 ft
·
9 sec
·
San Ramon Valley Boulevard
15
Arrive at destination
San Ramon Valley Boulevard
Fuel & Cost
Regular Gas
$6.32 one way
$12.64 round trip
$5.84/gal
25.4 MPG avg
10 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $6.02 | $6.51 | $13.03 |
| premium | $6.18 | $6.69 | $13.38 |
| diesel | $5.61 | $6.07 | $12.14 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$6
Estimated CO2 emission: 9.6 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $3 in charging · 0 stops · 70% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 8.3 | 0 | $2.89 | $1.32 |
| Efficient EV | 6.9 | 0 | $2.41 | $1.10 |
| EV Truck/SUV | 11 | 0 | $3.85 | $1.76 |
Gas CO2
10 kg
EV CO2
3 kg (70% 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
San Ramon, CA
Late night in San Ramon on Saturday
Local time
1:57 AM
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
33m 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 Diamond, CA to San Ramon, CA covers 27.5 miles and takes about 33m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are Donald D Doyle Highway, CA 4, Senator Daniel E Boatwright Highway. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 13.7 miles from Diamond, CA. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $6.32 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 is a short but busy drive. With 10 decision points packed into just 27.5 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 33m.
The main spots that need attention: at 8 miles (CA 242): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 18.8 miles (I 680 / Donald D Doyle Highway): Highway fork - watch signs carefully. Lane positioning matters here; at 26.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
On the drive from Diamond, CA to San Ramon, CA, road signs begin pointing toward Concord along the way.
Mostly flat terrain. The route ranges from 44 ft to 493 ft elevation with about 776 ft of total climbing.
Yes. Nearby national parks include Port Chicago Naval Magazine National Memorial, Rosie the Riveter WWII Home Front National Historical Park and San Francisco Maritime National Historical Park. There are 5 parks within detour distance of this route.
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, USGS 3DEP for elevation, and NPS for national parks. See our methodology for refresh cadence and limitations.
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