Monarch butterflies in Santa Cruz: the best groves this season, ranked

The best place to see monarch butterflies in Santa Cruz is the eucalyptus grove at Natural Bridges State Beach, and it isn’t close. In the last two western counts, the top monarch site in the entire West wasn’t in Pismo, Pacific Grove, or Big Sur. It was on the west side of Santa Cruz, a ten-minute walk from the surf. Lighthouse Field, two miles down West Cliff, tied it in 2024. So when people ask where the monarch butterflies in Santa Cruz actually are this winter, the answer is: closer than you think, earlier than you think, and in smaller numbers than your parents remember.

This is our ranking of the groves worth your morning, the three in town first, then the Central Coast sites worth a drive. Each one comes with the real counts, the timing, and the details that decide whether you see a chandelier of butterflies or a eucalyptus tree with nothing in it.

Monarch butterflies in Santa Cruz: where things stand this October

It’s early. The western monarchs start drifting into coastal groves in mid-October and leave by mid-February, according to California State Parks. As of October 16, the Pacific Grove Museum of Natural History was reporting fewer than a dozen at its sanctuary. That’s normal for this week. The arrivals build through November, and most sites peak somewhere between late November and early December.

These aren’t the monarchs that fly to Mexico. The ones you see here are the western population. They spend summer spread across the West, from Oregon and Washington to Idaho and Nevada, breeding on milkweed. Then, in late summer, a different generation hatches. This “super generation” lives six to nine months instead of six to eight weeks, and it heads for the California coast. No butterfly in the grove has ever been here before. They find it anyway.

How we ranked these groves

Three things, in this order:

1. Butterflies. Recent counts from the annual western monarch count, run by volunteers and compiled by the Xerces Society. A grove with a great boardwalk and 30 butterflies loses to a plain one with 1,500.
2. Access. Can you actually see the clusters? Is there a path, a deck, a place to park, someone around to point at the right tree?
3. Reliability. Monarchs move between trees, and sometimes between groves. Sites that have held steady for several seasons rank above sites that had one good year.

We left out spots that come up in old lists but haven’t shown real clusters lately. We also left out any count we couldn’t trace to a source.

The best monarch spots in Santa Cruz, ranked

1. Natural Bridges State Beach Monarch Grove (Westside Santa Cruz)

Why it’s #1: the numbers and the setup. Natural Bridges logged about 2,500 monarchs in the early-December count in 2025, the highest of any site in the West that season. The year before, it tied Lighthouse Field at about 1,400 for the top spot. Those numbers are a long way down from the 120,000 counted here in 1997, but in a bad decade this grove keeps coming out on top.

The grove is a designated Monarch Butterfly Natural Preserve, which State Parks calls the only state monarch preserve in California. It’s a stand of eucalyptus in a gently sloping canyon that blocks the ocean wind. The trees flower in winter, so the butterflies get shelter and breakfast in the same place. A wheelchair- and stroller-accessible boardwalk runs from near the visitor center down to an observation deck in the trees. You stand there, look up, and slowly realize the brown “leaves” are butterflies.

The insider details:

• The park is open 8am to sunset. The visitor center is open 11am to 4pm daily from October 1 through January 31, and it’s worth a stop to ask which trees the clusters are on that day.
• Day-use parking in the park lot is $10. The park also takes the state’s annual vehicle passes, including the California State Library Parks Pass you can check out with a library card.
• On the boardwalk: no dogs, no bikes, no skates or skateboards, no smoking, and keep it quiet.
• State Parks has filed plans to replace the boardwalk and observation platform with a new raised boardwalk on the existing piers. No construction dates are posted yet. Check the park page or call (831) 423-4609 before you make a special trip.
• Make it a half day. The same park has the wave-cut sea arch the beach is named for and some of the best tide pools in town. Check a tide chart and hit the pools at low tide, then walk up to the grove once the sun warms things up.

2. Lighthouse Field State Beach (West Cliff Drive)

Why it’s #2: it’s been neck and neck with Natural Bridges for years, and it’s free. Lighthouse Field tied for the largest monarch site in the West in 2024, at about 1,400, and it was the second-largest site in the West in 2018 and 2019. It slips below Natural Bridges because it had fewer butterflies last season (804 in the late-season count, against 1,540 at Natural Bridges) and because it has no boardwalk, deck, or visitor center to help you find the cluster.

What it has instead is location. It’s the big open field on West Cliff Drive by the lighthouse and Steamer Lane, about two miles east of Natural Bridges. Entry is free and the park is open 6am to sunset. You can watch surfers at the Lane, look up at a cluster, and grab a coffee downtown, all within an hour.

The insider detail: nobody hands you a map here, so do the Natural Bridges grove first and ask the staff what the clusters look like this week. Then walk or bike the West Cliff path to Lighthouse Field and find the trees yourself. With your eye trained, you’ll spot them in minutes.

3. Moran Lake County Park (Live Oak)

Why it’s #3: it’s the third-largest monarch site in Santa Cruz County, behind the two above, and it’s the one most visitors never hear about. The cluster sits in the eucalyptus near the Lode Street sanitation facility, on the East Cliff side of town. Volunteers counted 520 monarchs here in the 2025 late-season count. That’s a fraction of Natural Bridges, but it’s more than most famous groves on the coast managed last winter.

It ranks third because the numbers are smaller and the site is in flux. The County did hazard-tree work here in summer 2025 and has been updating its monarch habitat plan this year, so the trees the butterflies used last winter may not be the trees they use this one.

The insider detail: Moran Lake is a local’s beach, with Pleasure Point just up East Cliff. Pair the grove with a walk on the sand and a look at the surf, and you’ve had the Eastside version of the Natural Bridges morning, minus the crowd.

Worth the drive: the best monarch groves on the Central Coast

Santa Cruz has the best numbers right now. But if you’re driving Highway 1 this winter anyway, these are the groves we’d stop for, ranked the same way.

4. Pacific Grove Monarch Sanctuary (Pacific Grove)

Why it’s #4: Pacific Grove calls itself “Butterfly Town, U.S.A.,” and the sanctuary is still the best-run monarch visit on the coast. It’s at 250 Ridge Road, open sunrise to sunset, and free with no reservations. A packed-gravel, ADA-accessible path slopes gently down to nectar beds at the south end. Docents from the Pacific Grove Museum of Natural History are usually there from about 11am to 3pm, October through February, weather permitting.

The best feature is one you use before you leave home. Once the monarchs settle, the museum posts counts on its monarch page and updates them weekly. You can see exactly what you’re driving to.

It isn’t higher because the butterflies haven’t been. Volunteers counted 188 here in the 2025 count, down from about 6,500 in 2023. The town also takes its butterflies seriously: police enforce the sanctuary rules (stay on the path, no pets, no food, don’t touch or chase the monarchs) with a fine of up to $1,000.

The insider detail: street parking is free but limited, mostly on the streets around the sanctuary like Lighthouse Avenue. If you want to see clusters, come before 11am or on a gray day under 55 degrees. If you want flight, come after 11am on a sunny day and stand by the nectar beds.

5. Pismo State Beach Monarch Butterfly Grove (Pismo Beach)

Why it’s #5: Pismo had more monarchs than Pacific Grove last winter, 471 against 188, so on butterflies alone it would rank fourth. It’s fifth because it’s a much bigger drive from Santa Cruz, and its numbers have swung harder. Pismo counted 16,038 in 2023, the second-largest site in the state. Then it fell to a record-low 197 in 2024, and 471 in 2025 was its second-lowest count ever.

The grove is inside Pismo State Beach, on Highway 1 between Grover Beach and Pismo Beach, and admission is free. Volunteer docents staff it during the season, though the published talk times change from year to year, so ask when you get there.

The insider detail: parking is the hard part. The city’s tourism office says parking is very limited and you can’t park inside North Beach Campground. If you’re staying in town, walk or bike in.

On the bubble: Morro Bay, Goleta, and Fremont

• Morro Bay. The grove at the Morro Bay golf course had 10,029 monarchs in 2023, the third-largest count in the state. We couldn’t find reliable numbers for it from the last two seasons, so it’s not ranked. If you’re in the area, it’s worth a look.
• Ellwood Mesa, Goleta. This was once one of the biggest sites in Southern California, with more than 15,000 across the Ellwood groves in 2023. Last season’s high was about 20 butterflies, and only two were recorded in January. Restoration work is ongoing and can close the grove trail. Go for the mesa walk and treat any butterflies as a bonus.
• Ardenwood Historic Farm, Fremont. The East Bay Regional Park District runs naturalist monarch programs here in the fall. It’s not a big cluster site, but it’s the closest monarch outing for much of the Bay Area.

When to see monarch butterflies in Santa Cruz: the month and the hour

Getting the timing right matters more than picking the grove. Here’s how the season plays out.

The month

• Mid-October (now): the first arrivals. You’ll see scattered butterflies and small clusters, and you’ll get the boardwalk to yourself.
• Late October through November: State Parks calls this the best stretch at Natural Bridges. The clusters build week by week.
• Late November to early December: peak at most sites, and the window for the main western monarch count. Pacific Grove’s museum expects its peak around the end of November.
• December through January: still good, especially on mild, sunny days.
• February: the monarchs start mating and heading inland. They’re mostly gone by mid-February. Natural Bridges marks the send-off with its Migration Festival in February.

The hour and the weather

Monarchs are cold-blooded, and the weather controls everything they do. Below about 55 degrees they can’t really fly, so they hang in tight clusters on the branches. The park’s own guidance says they cluster when it drops below 60. Clusters look like hanging clumps of dead leaves or brown pinecones until one opens its wings and flashes orange.

• For clusters: go in the morning, before about 11am, or on a cool, overcast day.
• For flight: go late morning into early afternoon on a sunny day. As the sun hits the cluster, butterflies peel off one at a time, then by the dozen, and the air in the grove fills with them. That’s the moment people drive for.
• The best plan: arrive around 10am on a clear day after a cold night. You’ll catch the clusters, then the takeoff.

Bring binoculars or a telephoto lens. The clusters often sit high in the canopy, and they’re far more impressive at 8x.

One more thing to wear besides a layer: the monarchs leave in February, about when California’s other famous orange thing starts opening on the hillsides. Our California Golden State Poppy T-Shirt is the one we wear to the grove, in amber, burnt orange, and sage, which is about the monarch’s palette too.

Grove etiquette: how to watch monarchs without bothering them

A cluster is a butterfly saving energy for a winter it has to survive. Every time one gets knocked loose on a cold morning, it burns fuel it can’t easily replace. So the rules are simple.

• Don’t touch, pick up, or chase. That includes a monarch on the ground. On a cold morning, a grounded butterfly is often just waiting to warm up.
• Stay on the boardwalk or path. The ground under the grove is habitat, and in a natural preserve it’s protected.
• Leave the dog at home. Dogs aren’t allowed on the Natural Bridges boardwalk or in the Pacific Grove sanctuary.
• Keep it down. The parks ask for quiet, and the grove is better with it anyway.
• No drones. Nobody’s cluster needs a propeller next to it.

The milkweed mistake

This is the one well-meaning people get wrong. Milkweed is what monarchs breed on, so planting it sounds helpful. But milkweed isn’t native to the coastal strip. Both the Pacific Grove museum and Visit Santa Cruz County ask people to plant it only if they live at least five miles from the coast, because milkweed near the overwintering groves can confuse the migration. Near the coast, plant native flowers that bloom in fall, winter, or spring instead, so the butterflies have nectar.

The numbers, and why this winter matters

Every count you read above comes from the western monarch count, the volunteer survey the Xerces Society has compiled since 1997 (it used to be called the Thanksgiving count). The statewide story in those counts goes like this:

• 1997: about 1.2 million monarchs counted, the high-water mark.
• 2020: 1,901, the record low.
• 2021 to 2023: a rebound to 247,237, then 335,479, then 233,394.
• 2024: 9,119, the second-lowest on record.
• 2025: about 12,260 across 249 sites, the third-lowest since the count began.

Two things stand out. First, the population can swing hard from year to year, so one bad winter isn’t the whole story. Second, Santa Cruz keeps holding on. In a year when famous groves counted in the dozens, Natural Bridges and Lighthouse Field were the top two sites in the West.

On the federal side, the U.S. Fish and Wildlife Service proposed listing the monarch as threatened in December 2024. No final rule has been issued, and a settlement this fall set the deadline for a final decision at June 2030. For now, the monarch is still a proposed listing, while groves like Natural Bridges are protected by the parks that manage them.

If you want to do more than look, the count runs on volunteers. The main count happens over about three weeks around Thanksgiving, at hundreds of sites up and down the coast.

Monarch butterflies in Santa Cruz: FAQ

When is the best time to see monarch butterflies in Santa Cruz?

Late October through early December, with the biggest clusters usually from late November into early December. Go on a sunny day around 10am to catch both the clusters and the takeoff.

Where exactly are the monarchs at Natural Bridges?

In the eucalyptus grove in the canyon below the visitor center at 2531 West Cliff Drive. Follow the boardwalk down to the observation deck, then look up. The clusters move between trees, so ask the visitor center staff where they are that day.

Is it free to see the monarchs in Santa Cruz?

Seeing them is free everywhere on this list. At Natural Bridges you pay $10 to park in the state park lot. Lighthouse Field State Beach, the Pacific Grove sanctuary, and the Pismo grove don’t charge admission.

Can I bring my dog?

Not to the Natural Bridges boardwalk or the Pacific Grove sanctuary. Dogs aren’t allowed at Natural Bridges State Beach at all, so leave yours at home for this one.

Do the Santa Cruz monarchs migrate to Mexico?

No. These are western monarchs. They spend summer across the West and winter on the California coast. The eastern population, from east of the Rockies, is the one that winters in central Mexico.

How many monarchs will I see?

It depends on the year and the week. Last season’s top count at Natural Bridges was about 2,500, so on a good December day you might see hundreds or more in the grove. In mid-October, expect dozens at best.

What else is there to do nearby?

At Natural Bridges, the tide pools and the sea arch are right there. Up Highway 1, the pumpkin patches in Half Moon Bay run through the end of October. If you’re on a fall wildlife kick, the Mount Diablo tarantulas are out this month too. For a longer outing, our best hikes in the Bay Area ranking has trails within an easy drive of Santa Cruz. And if you’d rather chase color than wings, the Eastern Sierra fall colors are worth a weekend.

If you only do one

Go to Natural Bridges on a clear morning in late November. Get there around 10, pay for the lot, ask at the visitor center which trees the butterflies are on, and walk the boardwalk to the deck. Stand still, look up, and wait for the sun to hit the cluster. If you have another hour, walk West Cliff to Lighthouse Field and see if you can find the second cluster on your own.

Then come back in February, when they’re gone, and notice how empty the trees look. That’s the reason to go now.