Where to See a Grunion Run in San Diego

SAN DIEGO HIDDEN GEMS — A LOCAL GUIDE

Where to See a Grunion Run in San Diego — and What This Strange Event Actually Is

Imagine walking onto a San Diego beach late at night.

The beach is dark.

The tide is high.

Almost everyone else has gone home.

Then suddenly...

fish begin crawling out of the Pacific Ocean.

Hundreds of them.

Sometimes thousands.

They wriggle onto the wet sand, bury themselves, lay eggs and return to the sea.

No, this isn't a San Diego urban legend.

You may have just witnessed a California grunion run.

First Question: What in the World Is a Grunion?

California grunion are small, slender, silvery fish found along the coast of Southern California and northern Baja California.

They're usually only several inches long.

If you saw one swimming offshore, you probably wouldn't think much about it.

The strange part is what they do next.

These Fish Leave the Ocean to Lay Their Eggs

Most fish reproduce in water.

Grunion decided that wasn't interesting enough.

During particular high tides, adult grunion ride waves onto sandy beaches.

The females wriggle partially into the wet sand.

Males gather around them.

Eggs are deposited beneath the surface.

Then the adults wriggle back toward the Pacific.

The entire reproductive strategy depends on leaving the ocean.

And Somehow They Know Exactly When to Do It

Grunion runs aren't random.

They're closely connected to the tides and lunar cycle.

Runs generally occur during a narrow window following certain high tides at night.

The pattern is predictable enough that the California Department of Fish and Wildlife publishes expected grunion-run dates and times every year.

Think about that.

We can put wild fish walking onto a beach on a calendar.

So Why Do the Eggs Stay in the Sand?

This is where grunion become even stranger.

After spawning, the eggs remain buried beneath the beach.

The ocean retreats.

For roughly the next couple of weeks, the developing embryos stay beneath the sand above normal wave action.

Then another series of sufficiently high tides arrives.

Waves reach the buried eggs again.

The motion of the water helps trigger hatching.

Tiny grunion emerge and wash into the Pacific.

That's an Absolutely Ridiculous Life Cycle

And we mean that as a compliment.

Adult fish wait for the correct lunar and tidal conditions.

They beach themselves.

Eggs incubate underneath people walking on the sand.

Then future high tides wake the babies up.

Nature gets weird sometimes.

When Does Grunion Season Happen?

Grunion spawning generally occurs from March through August.

But you cannot simply choose any summer night and expect fish to appear.

Expected runs occur during specific nighttime windows tied to high tides.

That's why your first stop should always be the official California Department of Fish and Wildlife grunion schedule.

The Schedule Is a Prediction, Not a Reservation

This is very important.

The state calls them expected runs.

Not guaranteed runs.

Wildlife has not agreed to your itinerary.

Some nights can produce spectacular runs.

Other nights may produce a handful of fish.

And sometimes you'll spend an hour staring at the ocean wondering why Nancy's told you to stand on a beach at 11:30 at night.

That's wildlife watching.

Where Can You See Grunion in San Diego?

Grunion can potentially run on many sandy Southern California beaches.

You don't need a famous grunion attraction.

What you generally want is:

A broad sandy beach;
Good nighttime public access;
A predicted run;
Appropriate tide conditions;
And some patience.

Good Option #1: Pacific Beach

Pacific Beach is an obvious option for many of our guests.

There's plenty of sandy shoreline.

The beach is easy to reach.

And if you're staying nearby, you can walk down during the predicted run instead of making a major expedition.

We'd move away from the busiest nighttime areas and look for darker, quieter stretches of sand.

Good Option #2: Mission Beach

Mission Beach offers another long stretch of sandy Pacific shoreline.

Again, there's no magic grunion address.

You're watching for activity along the wet sand near the waterline.

If you're already staying in Mission Beach, this can be one of the easiest unusual San Diego experiences to attempt.

Good Option #3: Ocean Beach

Ocean Beach also provides sandy shoreline where grunion may appear during expected runs.

Just choose your location thoughtfully.

Keep clear of areas where surf conditions, rocks or nighttime access create unnecessary problems.

Good Option #4: Coronado

Coronado's enormous sandy beach is another strong candidate.

Imagine the Hotel del Coronado glowing in the distance while you're walking along the waterline looking for silvery fish emerging from the surf.

That's a pretty good San Diego night.

Even if the fish fail to cooperate.

Good Option #5: Silver Strand

Continue south from Coronado and you reach Silver Strand.

The long sandy shoreline offers another possibility during grunion season.

San Diego's official tourism organization even lists grunion among fish associated with Silver Strand.

It's a beautiful stretch of coast regardless.

Good Option #6: Imperial Beach

San Diego's southernmost beach community offers another long sandy shoreline near the Mexican border.

Grunion don't care that tourists usually stop exploring before they get this far south.

In fact, getting away from the most famous coastal neighborhoods is part of what makes this series fun.

Which Beach Is Best?

Here's the frustrating answer:

Nobody knows ahead of time.

One beach may have a strong run while another beach several miles away sees very little activity.

Grunion choose beaches based on conditions we can't perfectly predict.

So we wouldn't drive across the county because someone on social media saw fish at one beach three nights ago.

Choose a convenient sandy beach and enjoy the adventure.

Nancy's Local Tip: The Second Hour Is Often Better

Nancy's Local Tip

The official expected-run schedule typically gives a two-hour window.

Don't necessarily leave after fifteen minutes because nothing happened.

California Fish and Wildlife notes that the second hour is often better.

The second and third nights of a four-night predicted run period also frequently produce stronger activity.

In other words:

patience may be part of the ticket price.

Fortunately, the ticket price is zero.

Don't Use Bright Flashlights

Here's another important local tip.

Grunion can be sensitive to disturbance.

Standing at the waterline with a bright white flashlight pointed into the surf is not the best strategy.

Let your eyes adjust.

Use minimal light when possible.

And give the fish room to come ashore.

Look for the "Scouts"

A run may begin with only a few fish.

These early arrivals are sometimes referred to informally as scouts.

If you see only one or two fish, don't assume the show is over.

A larger wave of grunion may follow.

Or not.

Again:

wildlife has declined to guarantee performance.

Then Suddenly the Beach Can Come Alive

During a strong run, the transformation can be remarkable.

Silvery fish appear along the waterline.

More follow.

Females twist into the sand.

Males surround them.

Waves wash over the gathering.

Then fish wriggle back toward the water.

And the entire thing can disappear almost as quickly as it began.

Can You Catch Grunion?

Sometimes.

But this is where California law matters.

The year is divided into:

open season

and

closed season.

April, May and June Are Observation Only

California closes grunion take during April, May and June.

That allows the fish to spawn without harvest pressure during an important part of the season.

You may quietly observe.

But don't chase them.

Don't grab them.

Don't handle them and put them back.

Just watch.

And We Actually Prefer Observation Anyway

If you've never seen a grunion run before, leave the fish alone.

Watch what they're doing.

Watch how the females bury themselves.

Look at how the waves interact with the fish.

Let kids see the entire process.

There's considerably more happening than simply "fish on the beach."

If You Do Take Grunion During Open Season...

Know the current rules before you go.

As of 2026:

People age 16 and older need a valid California recreational fishing license to take grunion;
Grunion may be taken by hand only;
You may not use nets or other appliances;
You may not dig holes to trap fish;
The daily bag and possession limit is 30 fish per person.

Regulations can change, so verify the current rules with California Fish and Wildlife before participating.

Do Not Dig Holes to Catch Them

This rule makes sense when you understand what's beneath the sand.

Remember:

the eggs are down there.

Digging or aggressively disturbing the spawning area can damage exactly what the fish came ashore to create.

This Is Fantastic With Kids

Yes, it's late.

That may be the hardest part.

But there's something fantastic about telling kids:

"We're going to the beach at 10:30 tonight because fish might walk out of the ocean."

That's the kind of vacation statement children remember.

Make It a Nighttime Beach Adventure

Bring:

Warm layers;
A small flashlight;
Closed-toe or comfortable beach shoes;
A blanket if you're waiting;
Patience;
And realistic expectations.

Coastal San Diego can become surprisingly chilly late at night even after a warm day.

Our Ideal Grunion-Run Night

Check California Fish and Wildlife's expected-run schedule;
Confirm whether the date is open season or observation-only;
Choose a convenient sandy San Diego beach;
Check local beach access or closure information;
Arrive shortly before the predicted window;
Walk quietly near the wet-sand line;
Keep bright lights away from the water;
Watch for the first fish appearing in the waves;
Stay into the second hour if nothing happens immediately;
Let the fish finish what they came ashore to do.

What If No Grunion Show Up?

You spent an evening walking a San Diego beach under the moon.

We can think of worse vacation failures.

That's another reason we'd choose a beach convenient to where you're staying.

Don't turn this into a two-hour drive chasing a wildlife event nobody can guarantee.

2026 Grunion Season

The state's currently published 2026 expected-run calendar included predicted runs from March through August.

The April-through-June dates were observation-only because of the annual closed season.

Open-season predicted runs resumed July 1.

Because these dates change every year, we recommend linking directly to California Fish and Wildlife's current grunion schedule rather than permanently publishing a long list of dates in an evergreen article.

What to Know Before You Go

What: California grunion spawning on sandy beaches
Season: Generally March through August
When: Specific nighttime windows associated with high tides
Where: Sandy Southern California beaches, including multiple beaches throughout San Diego County
Cost to Watch: Free
Best For: Families, wildlife lovers and curious travelers
Guaranteed: Absolutely not
Closed Season: April through June — observation only
Most Important: Always check the current CDFW schedule and regulations before going

Why Grunion Runs Made Our Hidden Gems List

Because this is one of the most wonderfully bizarre things that happens naturally in San Diego.

You could visit the beach every afternoon for years and never know it occurs.

The surfers leave.

The umbrellas come down.

Sunset ends.

Darkness arrives.

Then, on a handful of carefully timed nights...

the fish come out of the ocean.

That's pretty difficult to beat.

🌴 San Diego Hidden Gems — A Local Guide

This article is part of Nancy's San Diego Hidden Gems — A Local Guide series, where we share unusual places, neighborhood favorites, hidden trails, natural phenomena and local experiences many visitors never discover.

After more than 25 years welcoming visitors to San Diego, we've learned that sometimes the city's strangest attractions don't happen during normal sightseeing hours.

Wait. The Fish Do WHAT?

Check the calendar.

Stay up late.

Walk onto the beach.

Turn off the bright flashlight.

Watch the waterline.

And if you're lucky, you'll see one of Southern California's strangest wildlife events unfold at your feet.

At Nancy's Vacation Rentals, we've spent more than 25 years helping visitors discover both San Diego's famous beaches and the remarkable things that happen on them after most tourists have gone home.

Find your San Diego vacation rental and start exploring beyond the obvious.

SEO Information

SEO Title:
San Diego Grunion Run: When, Where & How to See This Strange Event

Meta Description:
Discover San Diego's famous grunion runs, when thousands of tiny fish may come ashore at night to spawn. Learn when to go, where to look and the current rules.

Suggested URL:
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Secondary Keywords:
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Featured Image Concept

Create a cinematic San Diego beach scene at night during a spectacular grunion run. Moonlight should reflect across the Pacific while dozens of small silver grunion shimmer along the wet sand at the waterline. Show a family watching quietly from several feet away, using only a subtle red or low-light flashlight. Include smaller educational inset graphics showing a female grunion buried tail-first in the sand, eggs beneath the beach and hatchlings returning to the ocean. The mood should be mysterious, beautiful and fascinating rather than creepy.

Series:
SAN DIEGO HIDDEN GEMS — A LOCAL GUIDE

Main Headline:
WAIT.
THE FISH DO WHAT?

Secondary Headline:
THEY COME OUT
OF THE OCEAN.

Supporting Line:
San Diego's Incredible Grunion Run

Bottom Hook:
NIGHT BEACH • MOONLIGHT • WILDLIFE • ONLY IN SOUTHERN CALIFORNIA