Trip from Grossmont, CA to San Diego, CA

Q: How long is the trip from Grossmont, CA to San Diego, CA?

The drive from Grossmont, CA to San Diego, CA covers 12.7 miles and takes about 17m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.

Q: What are the main roads on this route?

The main roads are Martin Luther King Junior Freeway, CA 125, Grossmont Boulevard. Most of the drive stays on highways, so watch for ramps and exits.

Q: Is this a good same-day trip?

This is a comfortable same-day trip.

Q: Where should I stop halfway?

The midpoint is about 6.3 miles from Grossmont, CA. Look for rest areas, gas stations, or food options near the halfway mark.

Q: How much does gas cost for this trip?

At current regular gas prices, expect to spend about $2.92 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.

Q: What is the best time to leave?

Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.

Q: What towns show up on signs driving from Grossmont, CA to San Diego, CA?

The route from Grossmont, CA to San Diego, CA does not surface many named destination signs beyond the main corridor.

Q: Are there national parks near the route from Grossmont, CA to San Diego, CA?

Yes. Nearby national parks include Cabrillo National Monument.

Last recalculated Apr 16, 2026

Drive Time

17m

Distance

12.7 mi

20 km

Drive Score

7/10

Good drive

Same Day?

Yes, doable

Fuel Cost

$3

one way

EV Charging

Unknown

Best Time to Leave

4 AM

0h 16m ★

6 AM

0h 18m

8 AM

0h 21m

10 AM

0h 19m

12 PM

0h 19m

3 PM

0h 19m

5 PM

0h 21m

8 PM

0h 17m

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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Trip Overview

This short 12.7-mile drive from Grossmont to San Diego takes about 17 minutes and is a straightforward trip focused heavily on highway travel. With a 78% highway share, you'll spend most of your time on major freeways like the Martin Luther King Jr. Freeway and CA-125. Given its brevity and low fuel cost of around $3, this route is easily manageable as a single-day trip or even an easy segment of a larger journey within the Pacific Coast region. You won't need an overnight stay, and the minimal driving time allows for plenty of flexibility in your schedule.

Who Is This Route For?

Weekend Trip

Doable as a same-day drive at 17m. Total distance: 12.7 miles.

Family Friendly

Moderate complexity with 0 natural rest stops along the way.

Solo Traveler

17m drive, comfortable solo distance.

EV Driver

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

First-Time Driver

Mostly highway driving (78%). Some complex stretches to watch for.

Drive Character

Expect a highway-focused experience for the majority of this 12.7-mile journey. The route utilizes major roadways like the Martin Luther King Jr. Freeway and CA-125, contributing to its 78% highway share. The longest uninterrupted stretch you'll encounter is 8.5 miles on the Martin Luther King Jr. Freeway. This means the drive is characterized by relatively fast speeds and consistent freeway conditions, with minimal exposure to slower, local road driving.

Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.

There are about 11 navigation steps in the underlying route data, so the final approach matters more than the middle miles.

Martin Luther King Junior Freeway is the longest continuous segment at about 8.5 miles.

How Hard Is This Drive?

This is a straightforward highway drive that stays mostly on Martin Luther King Junior Freeway and CA 125. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 1.1 miles in.

Driving Effort 7/10

Focused - busy navigation packed into a short drive

Balances navigation complexity with total wheel time.

This is a short but busy drive. With 8 decision points packed into just 12.7 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 17m.

Where does it get tricky?

The main spots that need attention: at 1.1 miles: Lane positioning matters here; at 1.3 miles (CA 125): Merge point - match speed before joining. Lane positioning matters here; at 11.7 miles (16th Street): Lane positioning matters here.

Critical Maneuvers

5 of 8 key points

These are the spots where you need to pay the most attention. Preview them before you drive.

7

1.1 mi into trip | ~3m in

Take the ramp toward CA 125 South

Lane positioning matters here

Use the left lane. Toward CA 125 South

5

1.3 mi into trip | ~3m in | CA 125

Merge onto CA 125

Merge point - match speed before joining. Lane positioning matters here

Use the straight / slight right lanes.

6

11.7 mi into trip | ~15m in | 16th Street

Turn right onto 16th Street

Lane positioning matters here

Use the right lane.

6

11.8 mi into trip | ~15m in | Broadway

Turn left onto Broadway

Lane positioning matters here

Use the left lane.

6

12.7 mi into trip | ~17m in | Front Street

Turn left onto Front Street

Lane positioning matters here

Use the left lane.

Main Roads

Road	Distance	Duration
Martin Luther King Junior Freeway	8.5 mi	9m
CA 125	1.5 mi	1m
Grossmont Boulevard	0.9 mi	2m
Broadway	0.9 mi	1m
16th Street	0.1 mi	<1m
Grossmont Summit Drive	<0.1 mi	<1m
Shadow Road	<0.1 mi	<1m
Front Street	<0.1 mi	—

Some road-level metrics are being recalculated.

Longest stretch: Martin Luther King Junior Freeway — 8.5 mi, about 9m

Turn-by-Turn Driving Directions

Step-by-step road directions between Grossmont, CA and San Diego, CA.

1

Start on Shadow Road

216 ft · 9 sec · Shadow Road

2

Continue on Grossmont Summit Drive

430 ft · 25 sec · Grossmont Summit Drive

3

Turn left onto Grossmont Boulevard

0.9 mi · 2 min · Grossmont Boulevard

4

Take the ramp

0.2 mi · 30 sec

Toward CA 125 South Use the left lane.

5

Merge onto CA 125

1.5 mi · 1 min · CA 125

Use the straight / slight right lanes.

6

Take the exit

0.4 mi · 53 sec

Exit 15 Toward CA 94 West

7

Merge onto CA 94

8.5 mi · 9 min · Martin Luther King Junior Freeway

Use the straight / slight right lanes.

8

Turn right onto 16th Street

0.1 mi · 24 sec · 16th Street

Use the right lane.

9

Turn left onto Broadway

0.9 mi · 1 min · Broadway

Use the left lane.

10

Turn left onto Front Street

26 ft · 0 sec · Front Street

Use the left lane.

11

Arrive at destination

Front Street

Fuel & Cost

Regular Gas

$2.92 one way

$5.84 round trip

$5.84/gal 25.4 MPG avg 4 kg CO₂

Fuel Type	$/gal	One Way	Round Trip
midgrade	$6.02	$3.01	$6.02
premium	$6.18	$3.09	$6.18
diesel	$5.61	$2.80	$5.61

No toll roads detected on this route.

Drive Cost (one way)

Fuel

$3

Estimated CO2 emission: 4.4 kg one way. Prices: EIA weekly data, 2026-04-13.

Driving Electric?

About $1 in charging · 0 stops · 75% less CO₂

Vehicle Type	kWh	DC Fast	Home Charge
Average EV	3.8	$1.33	$0.61
Efficient EV	3.2	$1.11	$0.51
EV Truck/SUV	5.1	$1.78	$0.81

Gas CO2

4 kg

EV CO2

1 kg (75% 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 13, 2026

Origin

Grossmont, CA

Morning in Grossmont on Thursday

Local time

9:21 AM

PDT

Current temp

81°F

Unavailable

Live forecast

Destination

San Diego, CA

Morning in San Diego on Thursday

Local time

9:21 AM

PDT

Current temp

56°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

25 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

17m 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 Grossmont, CA to San Diego, CA covers 12.7 miles and takes about 17m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.

The main roads are Martin Luther King Junior Freeway, CA 125, Grossmont Boulevard. Most of the drive stays on highways, so watch for ramps and exits.

This is a comfortable same-day trip.

The midpoint is about 6.3 miles from Grossmont, CA. Look for rest areas, gas stations, or food options near the halfway mark.

At current regular gas prices, expect to spend about $2.92 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 8 decision points packed into just 12.7 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 17m.

The main spots that need attention: at 1.1 miles: Lane positioning matters here; at 1.3 miles (CA 125): Merge point - match speed before joining. Lane positioning matters here; at 11.7 miles (16th Street): Lane positioning matters here.

The route from Grossmont, CA to San Diego, CA does not surface many named destination signs beyond the main corridor.

Yes. Nearby national parks include Cabrillo National Monument.

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