San Diego to Mill Valley is 515.1 miles and takes about 9h 46m via I-5 and US-101, with a fuel budget near $123 and enough daylight to finish in a day. This long-haul drive covers California's Pacific Coast, predominantly on major freeways. It's a significant distance, so consider if you're up for a single long day or if splitting it over two days makes more sense for your travel style. The route offers a straightforward path up the state.
Trip Pace
Best split across 2 days
Treat the return leg as its own travel day rather than an afterthought.
Break Rhythm
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
257.6 miles from San Diego, CA
A natural place for your longest stop of the day
, about 4h 57m into the drive
.
Main Roads
Road
Distance
Duration
Westside Freeway
225.6 mi
4h 1m
San Diego Freeway
75.2 mi
1h 27m
Golden State Freeway
50 mi
57m
I 5 Truck
45.3 mi
52m
Santa Ana Freeway
30.4 mi
35m
Arthur H. Breed Junior Freeway
29.6 mi
34m
William Elton Brown Freeway
17 mi
18m
MacArthur Freeway
16.7 mi
19m
Longest stretch:
Westside Freeway
— 225.6 mi, about 4h 1m
Traffic on I-5
Hour-of-day weekday pattern from 230 FHWA count stations on your route.
Peak
2 PM
~3,763 veh/hr typical
· worst 4,643
Quietest
2 AM
~637 veh/hr
Peak-to-quiet ratio
5.9×
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 San Diego, CA and Mill Valley, CA.
1
Start on Front Street
26 ft·6 sec·Front Street
2
Turn left onto West Broadway
290 ft·12 sec·West Broadway
3
Turn left onto 1st Avenue
0.6 mi·1 min·1st Avenue
Use the left lane.
4
Take the ramp
0.2 mi·24 sec
Toward I 5 North: Los AngelesUse the left / straight lanes.
5
Merge onto I 5
13 mi·15 min·San Diego Freeway
Use the straight / slight right lanes.
6
Keep slight left at fork onto I 5
36 mi·43 min·San Diego Freeway
Use the straight / slight right lanes.
7
Keep slight right at fork onto I 5
18 mi·20 min·San Diego Freeway
Use the straight / slight right lanes.
8
Keep slight left at fork onto I 5
7.4 mi·8 min·San Diego Freeway
Use the straight / slight right lanes.
9
Keep slight right at fork onto I 5 Truck
1.6 mi·1 min·I 5 Truck
Toward Bake ParkwayUse the straight / slight right lanes.
10
Keep slight right at fork onto I 5 Truck
6.0 mi·6 min·I 5 Truck
Use the slight right lane.
11
Take the exit
0.2 mi·16 sec
Exit 100Toward Jamboree RoadUse the slight right lane.
12
Continue on this road
527 ft·11 sec·this road
13
Turn right onto Jamboree Road
0.1 mi·18 sec·Jamboree Road
Use the left / right lanes.
14
Turn left onto El Camino Real
2.2 mi·4 min·El Camino Real
Use the left lane.
15
Turn left onto Newport Avenue
357 ft·13 sec·Newport Avenue
Use the left lane.
16
Take the ramp
0.2 mi·16 sec
Toward I 5 North: Los Angeles
17
Merge onto I 5
1.3 mi·1 min·Santa Ana Freeway
Use the straight / slight right lanes.
18
Keep slight right at fork onto I 5
1.7 mi·1 min·Santa Ana Freeway
19
Keep slight right at fork onto I 5
9.4 mi·10 min·Santa Ana Freeway
Use the slight right lane.
20
Keep slight right at fork onto I 5
18 mi·20 min·Santa Ana Freeway
Use the straight / slight right lanes.
21
Keep slight right at fork onto I 5
25 mi·29 min·Golden State Freeway
Use the straight / slight right lanes.
22
Keep slight left at fork onto I 5
2.2 mi·2 min·Golden State Freeway
Use the straight / slight right lanes.
23
Keep slight right at fork onto I 5 Truck
1.5 mi·1 min·I 5 Truck
Exit 161AToward I 5 Truck North, CA 14 TruckUse the straight / slight right lanes.
24
Keep slight left at fork onto I 5 Truck
36 mi·41 min·I 5 Truck
Use the straight / slight right lanes.
25
Keep slight left at fork onto I 5
22 mi·25 min·Golden State Freeway
Use the straight / slight right lanes.
26
Keep slight right at fork onto I 5
226 mi·4 hr 1 min·Westside Freeway
Toward I 5 NorthUse the straight / slight right lanes.
27
Keep slight left at fork onto I 580
16 mi·17 min·William Elton Brown Freeway
Toward I 580 West: Tracy, San Francisco
28
Keep slight right at fork onto I 580 Bypass
1.1 mi·1 min·William Elton Brown Freeway
29
Merge onto I 580
18 mi·20 min·Arthur H. Breed Junior Freeway
Use the straight / slight right lanes.
30
Keep slight right at fork onto I 580
12 mi·13 min·Arthur H. Breed Junior Freeway
Use the straight / slight right lanes.
31
Keep slight right at fork onto I 580
8.3 mi·9 min·MacArthur Freeway
Toward I 580: Oakland, San FranciscoUse the slight left / slight right lanes.
32
Keep slight left at fork onto I 580
8.3 mi·9 min·MacArthur Freeway
Use the straight / slight right lanes.
33
Continue on I 80; I 580
3.3 mi·4 min·Eastshore Freeway
Use the straight / slight right lanes.
34
Keep slight right at fork onto I 580
12 mi·15 min·John T. Knox Freeway
Exit 13BToward I 580 West: Point Richmond, San RafaelUse the straight / slight right lanes.
35
Take the exit
0.4 mi·35 sec
Exit 2AToward Sir Francis Drake BoulevardUse the slight right lane.
36
Keep slight left at fork onto Sir Francis Drake Boulevard East
1.5 mi·2 min·Sir Francis Drake Boulevard East
Use the straight lane.
37
Take the ramp
0.3 mi·35 sec
Toward US 101 South: San FranciscoUse the left / straight lanes.
38
Merge onto US 101
2.5 mi·3 min·Redwood Highway
Use the straight lane.
39
Take the exit
0.3 mi·31 sec
Exit 447Toward CA 131: Tiburon Boulevard, East Blithedale AvenueUse the slight right lane.
40
Turn right onto CA 131
1.7 mi·4 min·East Blithedale Avenue
Use the right lane.
41
Turn right onto Hill Street
295 ft·17 sec·Hill Street
42
Turn left onto Sunnyside Avenue
250 ft·8 sec·Sunnyside Avenue
43
Arrive at destination
Sunnyside Avenue
Trip Plan
Given the 9h 46m duration, planning for two days is highly recommended to avoid fatigue. Aim to depart early in the morning to maximize daylight. With two recommended stops, you can break up the 515.1 miles into manageable segments. Keep an eye on your fuel gauge, especially during the longer stretches, and budget around $123 for gas. The longest stretch of highway is 225.6 miles, so plan your fuel and rest breaks before hitting those longer, less populated sections.
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.
This drive is better paced as a 2-day trip.
Plan roughly 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 257.6 miles from San Diego, CA, or about 4h 57m into the drive.
The longest continuous stretch on this route runs about 225.6 miles.
Consider an overnight stop or starting very early.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 113 miles or 2h 14m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 257.6 miles or 4h 57m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Overnight split
Day 1 wrap after about 257.6 miles or 4h 57m
Stop before fatigue turns the last few hours into a grind. You want day two to start fresh, not just resumed.
Final approach
Final hour starts around 8h 29m
Traffic, exits, and arrival timing usually matter more near Mill Valley, CA than in the middle of the route.
Before You Leave
+
Open the route before leaving San Diego, 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.
+
Pick one backup stop option before the midpoint in case traffic changes your pacing.
+
Treat this as a 2-day road trip and book the overnight stop before the busiest arrival window.
Day 1
Settle into the route from San Diego, CA
Aim for roughly 258 miles and 4.9 hours of wheel time on this day.
Day 2
Finish the approach into Mill Valley, CA
Aim for roughly 258 miles and 4.9 hours of wheel time on this day.
Your first comfortable stop window is around 113 miles from San Diego, CA.
This route usually feels better as a 2-day drive than as one long push.
Plan about 2 real breaks rather than only quick fuel stops.
The longest stretch is on Westside Freeway for about 225.6 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 39
5 decision points cluster between mile 76.1 and 513.1 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
7
76.1 mi into trip|~1h 29m in|I 5 Truck
Keep slight right at fork onto I 5 Truck toward Bake Parkway
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Toward Bake Parkway
9
144.7 mi into trip|~2h 52m in|I 5 Truck
Keep slight right at fork onto I 5 Truck toward I 5 Truck North, CA 14 Truck
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Exit 161A
Toward I 5 Truck North, CA 14 Truck
8
476.8 mi into trip|~8h 54m in|I 580 / MacArthur Freeway
Keep slight right at fork onto I 580 / MacArthur Freeway toward I 580: Oakland, San Francisco
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left / slight right lanes.
Toward I 580: Oakland, San Francisco
9
496.8 mi into trip|~9h 18m in|I 580 / John T. Knox Freeway
Keep slight right at fork onto I 580 / John T. Knox Freeway toward I 580 West: Point Richmond, San Rafael
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Exit 13B
Toward I 580 West: Point Richmond, San Rafael
8
513.1 mi into trip|~9h 40m in
Take the exit toward CA 131: Tiburon Boulevard, East Blithedale Avenue
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 447
Toward CA 131: Tiburon Boulevard, East Blitheda...
Fuel & Cost
Regular Gas
$120.97 one way
$241.93 round trip
$5.97/gal25.4 MPG avg180 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$6.18
$125.37
$250.74
premium
$6.30
$127.70
$255.40
diesel
$5.35
$108.50
$216.99
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$121
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$251–$361
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 180.2 kg one way.
Prices: EIA weekly data, 2026-06-01.
Driving Electric?
About $54 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
154.5
1
$54.09
$24.72
Efficient EV
128.8
1
$45.07
$20.60
EV Truck/SUV
206
2
$72.11
$32.97
Gas CO2
180 kg
EV CO2
60 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 Jun 1, 2026
Origin
San Diego, CA
Afternoon
in San Diego on Wednesday
Local time
12:52 PM
PDT
Current temp
61°F
Cloudy
0 mph0% chanceLive forecast
Beach Hazards Statement
Beach Hazards Statement issued May 31 at 1:12PM PDT until June 2 at 5:00AM PDT by NWS San Francisco CA
Destination
Mill Valley, CA
Afternoon
in Mill Valley on Wednesday
Local time
12:52 PM
PDT
Current temp
52°F
Mostly Clear
SW 1 mph0% chanceLive forecast
Beach Hazards Statement
Beach Hazards Statement issued May 31 at 1:12PM PDT until June 2 at 5:00AM PDT by NWS San Francisco CA
69°F
Venice, CA
170 mi in
55°F
Fremont, CA
340 mi in
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.
For long drives, weather on day two can matter just as much as conditions at departure, so check the whole travel window rather than only the first day.
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
9 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
9h 46m on the road
This is long enough that the arrival forecast matters almost as much as departure conditions. Recheck both ends before you roll.
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.
Muir Woods National Monument
National Monument
Walk among old growth coast redwoods, cooling their roots in the fresh water of Redwood Creek and lifting their crowns to reach the sun and fog. Federally protected as a National Monument since 1908,...
2 mi from route
~5 min detour
$15
near mile 515.1
Caution: Auto-Theft Warning - Only Bring What You Need to the Park
Rosie the Riveter WWII Home Front National Historical Park
National Historical Park
Celebrate and honor the contributions and sacrifices of American civilians on the WWII home front. Discover how diverse communities lived, worked, and interacted. Many faces, many stories, many truths...
3 mi from route
~8 min detour
Free
near mile 497.4
Experience a park so rich it supports 19 distinct ecosystems with over 2,000 plant and animal species. Go for a hike, enjoy a vista, have a picnic or learn about the centuries of overlapping history f...
4 mi from route
~11 min detour
Free
near mile 515.1
In 1542, Juan Rodriguez Cabrillo climbed out of his boat and onto shore, becoming the first European to set foot on what is now the West Coast of the United States. Cabrillo National Monument not only...
Established in 1988, San Francisco Maritime National Historical Park celebrates America’s maritime heritage on the Pacific Coast. Our 50-acre park has grown around Aquatic Park Cove, a protected area...
8 mi from route
~21 min detour
Free
near mile 497.4
On July 17, 1944, a massive explosion jolted the San Francisco East Bay area, shattering windows and lighting up the night sky. At Port Chicago Naval Magazine, 320 men were killed instantly when two s...
19 mi from route
~47 min detour
Free
near mile 497.4
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This drive is almost entirely on freeways, with a 98% highway share. You'll spend most of your time on the Westside Freeway, San Diego Freeway, and Golden State Freeway. The longest continuous stretch on this route without significant deviation is 225.6 miles, mostly on the Westside Freeway. Expect constant merging and exiting as you navigate through multiple urban and suburban areas.
98% highway — fuel and pacing are the main things to plan.
43 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 225.6 mi on Westside Freeway.
How Hard Is This Drive?
10/10
This is a straightforward highway drive that stays mostly on Westside Freeway and San Diego Freeway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 76.1 miles in near I 5 Truck.
Driving Effort10/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 39 significant decision points across 515.1 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 76.1 miles (I 5 Truck): Highway fork - watch signs carefully. Lane positioning matters here; at 144.7 miles (I 5 Truck): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 476.8 miles (I 580 / MacArthur Freeway): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Hilly terrain with moderate elevation changes
3,393 ft39 ft
Total Climb
3,989 ft
Total Descent
3,945 ft
Highest Point
3,393 ft
~184 mi in
Elevation Range
3,354 ft
Notable High Points
3,393 ft at ~184 miles+1,734 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 San Diego, CA to Mill Valley, CA, road signs begin pointing toward San Francisco along the way.
From balmy beaches with a laid-back attitude to a gleaming modern image, San Diego offers much for the tourist to enjoy. Situated on the Southern California seacoast, San Diego is the second largest city in the state, with 1.4 million residents (2020), and has long attracted travelers for its ideal climate, miles of beaches, and location on the Mexican border right across from Tijuana.
But there's much more here than surfer culture and a quick hop across the border. A rich maritime and military heritage lives on in San Diego, which is home to the Pacific Fleet of the United States Navy. The city has also become known for its part in the wildlife conservation movement, owing to the presence of the world-renowned San Diego Zoo and Safari Park and the Scripps Institution of Oceanography. Natural scenery abounds from rocky tidepools and seaside cliffs to desert hills and canyons inland.
Top landmarks
•Balboa Park — historic park in San Diego, California
•Cabrillo National Monument — National Monument of the United States and historic district
Mill Valley is a city in Marin County, in the North Bay region of the Bay Area of California. The city begins in the canyons and ridges at the base of Mount Tamalpais and extends into a broad valley that reaches the Richardson Bay portion of the San Francisco Bay.
Top landmarks
•Outdoor Art Club — historical Landmark in Mill Valley, California, United States
The longest stretch is about 225.6 miles on Westside Freeway. The full list of main roads is in the Roads section above.
Yes — a 2-day pace is more comfortable than one long haul. A sensible stopping point is after roughly 258 miles on day one.
Yes — we found about 41 rest areas or service plazas 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 Mill Valley, 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 2 meaningful breaks. There are 41 rest areas along the route for bathroom stops.
The main spots that need attention: at 76.1 miles (I 5 Truck): Highway fork - watch signs carefully. Lane positioning matters here; at 144.7 miles (I 5 Truck): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 476.8 miles (I 580 / MacArthur Freeway): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Muir Woods National Monument, Rosie the Riveter WWII Home Front National Historical Park and Golden Gate National Recreation Area (6 total within detour distance). See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 9.8 hours each way, a round trip means 19.5 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Mill Valley, CA before the return drive.
