San Francisco's Secret Seasons: A Month-by-Month Guide to the City's Natural Calendar

Last updated: February 2026

TL;DR: San Francisco doesn’t have “normal” seasons — no snow, no real fall foliage, no sweltering summer. Instead, it has its own secret calendar: magnolia blooms in January, wildflowers in April, fog all summer, Dungeness crab in winter, bonfire season at Ocean Beach, and the best weather of the year in September and October. Here’s every natural, food, and outdoor season that defines life in SF, month by month.

One of the weirdest things about moving to San Francisco from the East Coast was losing my sense of seasons. There’s no first snowfall. The leaves don’t really change. “Summer” is the coldest, foggiest time of year (yes, really). For the first year, I felt seasonally disoriented.

But then I started noticing something: San Francisco does have seasons — they’re just completely different from what you expect. The magnolias explode in January. Wildflowers carpet the hillsides in April. Dungeness crab appears at the fish markets in November. The fog has its own calendar. And once you learn to read SF’s natural rhythms, the city feels more alive than anywhere I’ve ever lived.

Here’s the calendar nobody gives you.

January

Magnolia Season Begins

The SF Botanical Garden has over 200 magnolia trees, and they start blooming in mid-January — enormous saucer-sized flowers in pink, white, and magenta, erupting from bare branches against gray winter skies. It’s one of the most beautiful things in the city, and most people don’t even know about it.

Where: SF Botanical Garden, Golden Gate Park (Camellia Garden and Temperate Asia collection)
When: Mid-January through March, with peak bloom late January to mid-February
Cost: Free for SF residents; $13 for non-residents
Tip: The M. campbellii varieties bloom first. Go on a weekday morning for the quietest experience.

Citrus Season (Peak)

January is when Bay Area citrus peaks at farmers markets. Meyer lemons (a Bay Area backyard staple — many people have them growing in their yards), Cara Cara oranges, Satsuma mandarins, kumquats, and pomelos. The citrus at the Ferry Building Saturday market in January is genuinely world-class.

Dungeness Crab Season (Continues)

The commercial season typically runs November through spring (exact dates vary year to year due to whale protections and water quality testing). January and February are prime crab months. More on this in November.

Gray Whale Migration (Southbound)

Gray whales pass just offshore on their way from the Bering Sea to Baja California. Point Reyes is the best viewing spot — 94% of migrating Pacific gray whales pass within one mile of the lighthouse. On peak days in January, over 1,000 whales can pass in a single day.

February

Magnolia Season (Peak)

Late January through mid-February is peak magnolia bloom. All the campbellii cultivars, dawsoniana, and denudata fire at once — it’s the best show of the year. Go now if you can.

Gray Whale Migration (Northbound Begins)

The northbound migration starts mid-February and continues through early May. You might spot mothers and calves traveling together on the return trip.

Mushroom Season (Late)

The winter mushroom season (which started with the fall rains) is winding down but still going. Black truffles, black trumpets, hedgehog mushrooms, and yellowfoot are still appearing at farmers markets and specialty shops like Far West Fungi in the Ferry Building.

Rainy Season

February is the second-wettest month (after December). The hills are bright green, the waterfalls in the parks are running, and the city has a lush, washed quality that’s surprisingly beautiful. Check our rainy day guide for what to do when it pours.

March

Wildflower Season Begins

The hillsides start turning colors. California poppies, lupine, and wild radish begin appearing on Twin Peaks, in Glen Canyon, and across the Marin Headlands. The show builds through April.

Tulip Season

Two tulip experiences, both gorgeous:

Queen Wilhelmina Garden (Golden Gate Park): Over 10,000 tulips and Icelandic poppies bloom under the Dutch Windmill at the park’s western end. Usually in full bloom through March and into early April.
American Tulip Day (Union Square): 80,000 free tulips cover Union Square and you can pick up to 8 for free. 2026 date: March 21.

Cherry Blossom Season Starts

The Japanese Tea Garden in Golden Gate Park starts showing cherry blossoms mid-March. Peak bloom lasts only about two weeks — blink and you’ll miss it. Free admission hours: 9–10 AM every Monday, Wednesday, and Friday.

Ocean Beach Bonfire Season Opens (March 1)

The fire pits at Ocean Beach reopen for the season. There are 16 fire rings between Stairwells 15 and 20, first-come, first-served. The bonfire ritual: show up before sunset on a Friday or Saturday, claim a pit (arrive early — they go fast on nice weekends), bring your own wood and s’mores supplies, layer up because it gets cold fast when the sun drops. Bring a bucket to haul ocean water for extinguishing — never cover coals with sand (it insulates them and fills the pit).

Bonfire season runs March 1 through October 31. Hours: 6 AM to 9:30 PM. No fires on Spare the Air days.

Strawberry Season Begins

The first strawberries start appearing at farmers markets. The season runs April through September, peaking in May and June.

April

Wildflower Peak

This is the month. The Marin Headlands, Twin Peaks, Glen Canyon, and the Coastal Trail are carpeted in California poppies, lupine, checker-bloom, and buttercups. The combination of green hills, wildflowers, and ocean views is breathtaking.

Best wildflower spots:

Marin Headlands (Coastal Trail and Hill 88 Trail) — the most dramatic displays
Twin Peaks — California poppies on the grassy hillside
Glen Canyon (in the city) — surprisingly lush displays
Russian Ridge (Midpeninsula) — one of the best in the entire Bay Area
Tennessee Valley (Marin) — lupine, checker-bloom, California poppies

Cherry Blossom Festival

The Northern California Cherry Blossom Festival in Japantown (April 11–12 and 18–19 in 2026) draws over 220,000 people. Traditional Japanese performances, taiko drumming, food, and a Grand Parade. Time your visit to catch the actual blossoms in the Japanese Tea Garden too.

Humpback Whale Arrivals

Humpback whales begin arriving off the California coast for their foraging season (April through November). Unlike gray whales, which migrate past, humpbacks actually stick around to feed in the nutrient-rich waters near the Farallon Islands.

Fava Bean Season

A spring farmers market staple that signals the season is turning. Fava beans, asparagus, and spring peas fill the market stalls.

May

Stone Fruit Season Begins

Cherries arrive first — the opening act of what becomes the most glorious fruit season anywhere in the country. Apricots follow, then nectarines and peaches. By June, the stone fruit at the Ferry Building farmers market will make you question every peach you’ve ever eaten.

The Blenheim apricot (available briefly in June) is a Bay Area treasure — intensely flavored, fragile, impossible to ship. If you see them at a farmers market, buy them immediately. They’ll be gone by next week.

Wildflowers (Late Season)

The late bloomers — mule ear sunflowers, owl’s clover — carry the show into May, especially at higher elevations and on ridges.

Green Hills Transition

The famous golden California hills start their transition from green to gold. By late May, the grass is drying out and the landscape takes on that classic California look.

June

Fog Season Arrives (June Gloom)

Here it comes. The marine layer starts pushing in regularly, and the western half of the city — the Sunset, the Richmond, Ocean Beach — gets blanketed in thick, cold fog. Locals call it June Gloom, and it’s just the beginning.

How the fog works: The cold Pacific Ocean cools the coastal air. As the Central Valley inland heats up, the temperature difference creates a pressure system that sucks the cold, wet marine air over the hills and into the city. The western neighborhoods get hit hardest. The east side (Mission, Noe Valley, Potrero Hill, Dogpatch) often stays clear.

Check fog.today before making any outdoor plans.

Stern Grove Season Opens

Free Sunday afternoon concerts begin in June and run through August. This is one of my favorite things about living here. Pack a picnic, go early.

Heirloom Tomato Season (Early)

The first heirloom tomatoes start appearing at farmers markets in late June. The real season is July and August, but the early arrivals are exciting.

Strawberry Peak

Strawberries hit their peak. The ones at the farmers market will ruin you for supermarket strawberries forever.

July

Fog Season (No-Sky July)

July and August are the foggiest months. Average temperatures in San Francisco in July: mid-60s. Visitors from literally anywhere else arrive in shorts and immediately freeze. This is when Mark Twain’s famous (and probably misattributed) quote applies: “The coldest winter I ever spent was a summer in San Francisco.”

The fog has a name: Karl. He has his own social media accounts. Locals have a complicated relationship with him — we complain constantly but would honestly be devastated if he left.

Heirloom Tomato Season (Peak Coming)

The tomatoes are getting good. Dry-farmed tomatoes — a Bay Area specialty where farmers use no irrigation, producing intensely concentrated flavor — start appearing in late July. The Ferry Building typically holds a Tomato Festival in late July.

Fig Season Begins

The first fig crop (called “breba”) arrives in July. The main fig crop comes August through October.

Ocean Beach Bonfires (Peak)

With the long summer evenings and the fog creating a dramatic backdrop, July is prime bonfire season at Ocean Beach. The fire pits are popular — claim yours by 4–5 PM on weekends.

August

Fog Season (Fogust)

Peak fog. The coldest month for many parts of the city. But here’s the thing: the east side microclimates (Mission, Bernal Heights, Potrero Hill) can still be warm and sunny while Ocean Beach is socked in. Learn the microclimates and you can outsmart the fog.

Heirloom Tomato Peak

This is the moment. Late July through August is when the dry-farmed heirloom tomatoes, the Brandywines, the Cherokee Purples, the Green Zebras hit the farmers markets. Go to the Ferry Building Saturday market and taste everything. The dry-farmed Early Girl tomatoes from Dirty Girl Produce are a religious experience.

Stone Fruit Peak

Peaches, nectarines, and pluots are at their absolute best. The freestone peaches in August — you bite in and the pit just falls out and the juice runs down your chin — are summer in fruit form.

Perseid Meteor Shower

Mid-August brings the Perseids. Ocean Beach, Fort Funston, or Lands End after dark (if the fog cooperates) offer dark enough skies to catch some. Bring every warm layer you own.

September

The Real Summer Arrives

This is the cheat code. San Francisco’s actual warm, sunny, beautiful weather happens in September and October. The fog retreats. Temperatures hit 70–80°F. The sky turns that perfect California blue. Locals call it “Indian Summer” (technically inaccurate since we never get a first frost, but the name has stuck).

September is when you do all the outdoor things you were too cold to do in July — beach days, rooftop drinks, outdoor dining, hilltop sunsets.

Mushroom Season Begins

After the first fall rains (which can arrive as early as late September), the mushroom season ignites. The Bay Area — especially Marin and Sonoma counties — is one of the richest mushroom-hunting grounds in North America. Chanterelles, porcini, and matsutake start appearing at farmers markets and on restaurant menus.

Rule of thumb: 10 days after 2 inches of rain = porcini time.

ForageSF offers foraging classes if you want to learn to find your own.

Late Stone Fruit and Early Apples

The stone fruit season is winding down but the last peaches are still incredible. Apples and pears start their run. The Gravenstein apple (a Sonoma County specialty) peaks in late August/September.

Surfing Season Begins

For surfers, fall is the season. The wind shifts offshore at Ocean Beach, the swell becomes more manageable, and the conditions are the cleanest of the year. September through November is when the locals’ Ocean Beach comes alive. (Important caveat: Ocean Beach is not for beginners. Heavy beach break, strong currents, cold water year-round.)

October

The Best Month in San Francisco

I will die on this hill (possibly Bernal Hill): October is the best month to be in San Francisco. The weather is perfect, the fog is gone, the events calendar is stacked (Hardly Strictly Bluegrass, Fleet Week, Open Studios), and the city just glows.

Monarch Butterfly Season

Monarch butterflies arrive at their overwintering sites along the California coast in mid-October. The closest significant sites to SF are Natural Bridges State Beach in Santa Cruz (about 75 miles south — the only California State Monarch Preserve) and Pacific Grove near Monterey. Peak numbers: late November through early January. Worth a day trip.

Mushroom Season (Building)

Chanterelles, hen of the woods, matsutake, porcini, and white truffles are all in season. The mushroom stalls at the Ferry Building farmers market are at their most exciting. Far West Fungi’s seasonal calendar reads like a treasure map.

Ocean Beach Bonfire Season (Last Month)

Fire pits close October 31. Get your last bonfires in while the weather cooperates.

Fall Foliage (SF Style)

San Francisco’s fall color is subtle compared to New England, but it exists. The SF Botanical Garden is the best spot — the Temperate Asia area has gorgeous ginkgo trees turning gold, and the Japanese Tea Garden has maples in deep reds. Peak color: late October to mid-November.

For dramatic fall foliage, drive to Sonoma County wine country — National Geographic named it one of the best places in the country for fall color (grapevine leaves turning every shade of red, orange, and gold).

November

Dungeness Crab Season Opens

The recreational season opens November 1 (the commercial season typically follows mid-November, though it’s been delayed in recent years due to whale protections). This is a genuine cultural event in San Francisco. The local move:

Buy off the boat at Fisherman’s Wharf, Pier 47 — fishermen sell directly starting around 6 AM on sale days
Ferry Building vendors have excellent quality
Price: Expect around $11/lb, $20–25 per whole cooked crab
How to eat it: Buy it whole and cooked, take it to a waterfront bench, crack it open with your hands, dip in melted butter. This is the authentic San Francisco crab experience.

The season runs through spring, but the first crab of the season is a moment. People line up.

Rainy Season Returns

The first real rains arrive (sometimes late October, sometimes November). The hills start turning green again. The city smells incredible after the first rain — that petrichor mixed with eucalyptus.

Mushroom Season (Peak)

November and December are peak mushroom months. Black truffles, chanterelles, porcini, matsutake, white truffles, and candy caps are all available. Restaurant menus shift dramatically — look for mushroom-focused dishes at the best restaurants.

Persimmon and Pomegranate Season

Fuyu and Hachiya persimmons, along with pomegranates, fill the farmers market stalls. These are the jewels of the fall/winter produce season.

Monarch Butterflies (Peak Approaching)

The butterflies are settling into their overwintering groves. Numbers build through November and December.

December

Dungeness Crab (Prime)

December and January are peak crab months. If you’re visiting SF for the holidays, a whole Dungeness crab is a better souvenir than anything you’ll find in a gift shop.

Citrus Season Returns

Meyer lemons, mandarins, Cara Cara oranges, grapefruit, and kumquats flood the markets. The citrus at Bay Area farmers markets in December is extraordinary — the kind of thing that makes you understand why people live here despite the cost of living.

King Tides

The highest tides of the year typically occur in December and January (2–3 events per winter). They offer a dramatic preview of future sea level rise — water floods low-lying areas along the Embarcadero and Bay shoreline. The California Coastal Commission runs a citizen science King Tides Project where you can photograph and document the high water. It’s both beautiful and sobering.

Mushroom Season (Peak Continues)

The full mushroom bounty: black truffles, candy caps (which smell like maple syrup), chanterelles, hedgehog mushrooms, porcini, white truffles. This is when mushroom lovers are at their happiest.

Whale Watching (Gray Whales Return)

The southbound gray whale migration begins again in December. The cycle starts over.

The Year at a Glance

Month	Nature	Food	Outdoor
Jan	Magnolia bloom (peak), gray whales	Dungeness crab, citrus peak	Green hills, rainy hikes
Feb	Magnolias (late), whale migration	Crab continues, late mushrooms	Rainy season, green everywhere
Mar	Wildflowers start, tulips, cherry blossoms	Strawberries begin, artichokes	Bonfire season opens, hiking
Apr	Wildflower peak, humpback arrivals	Fava beans, asparagus, cherries	Best hiking month
May	Late wildflowers, hills turning gold	Stone fruit starts, Blenheim apricots	Bay sailing picks up
Jun	Fog arrives (June Gloom)	Strawberry peak, early tomatoes	Stern Grove opens, surfing
Jul	Fog (No-Sky July), Karl rules	Tomatoes building, figs begin	Bonfire peak, foggy beach walks
Aug	Peak fog (Fogust)	Heirloom tomato peak, stone fruit peak	Outside Lands, Perseids
Sep	Real summer! Fog retreats	Mushrooms begin, late stone fruit, apples	Surfing peak, best beach weather
Oct	Best month — monarchs, fall color	Mushroom season builds, persimmons	Bonfire last month, hiking
Nov	Crab season opens, rain returns	Dungeness crab, peak mushrooms, citrus	Green hills return
Dec	King tides, gray whales	Prime crab, citrus, mushrooms	Whale watching, king tide viewing

Tips for Timing Your Visit Around the Seasons

For wildflowers: Come in April. The Marin Headlands in peak bloom are unforgettable.

For food: November is extraordinary — Dungeness crab, mushrooms, persimmons, and citrus all at once. August for tomatoes and stone fruit.

For weather: September and October. This is when locals say “you should come visit.”

For nature watching: January for whale watching and magnolias. October for monarch butterflies. March for tulips and cherry blossoms.

For outdoor activities: March through May for hiking (green hills, wildflowers). September–October for everything (beach, hiking, cycling, outdoor dining). March through October for Ocean Beach bonfires.

For more on SF weather patterns, check our complete weather guide and what to wear month-by-month.

FAQ: San Francisco Seasons

Does San Francisco have seasons?

Yes — just not the ones you’re used to. SF’s seasons are defined by fog cycles (foggy June–August, clear September–October), food seasons (Dungeness crab November–spring, heirloom tomatoes July–September), and bloom seasons (magnolias in January, wildflowers in April, cherry blossoms in March). The city’s mild climate means something is blooming, fruiting, or migrating almost every month of the year.

When is Dungeness crab season in San Francisco?

The recreational season opens November 1. The commercial season typically starts mid-November but has been delayed in recent years to protect migrating whales (the 2025–2026 season opened January 5). The season runs through spring. Peak eating months are December through February. Buy whole cooked crabs at the Ferry Building or directly from boats at Fisherman’s Wharf.

When do the magnolias bloom in San Francisco?

Mid-January through March, with peak bloom in late January to mid-February. The SF Botanical Garden in Golden Gate Park has over 200 magnolia trees and is the best place to see them. Free for SF residents.

When is the best time to see wildflowers near San Francisco?

April is peak wildflower season. The Marin Headlands, Twin Peaks, Glen Canyon, and Russian Ridge (Midpeninsula) all have spectacular displays of California poppies, lupine, and other native wildflowers. Blooms start in March and can extend through May.

Can you have a bonfire at Ocean Beach in San Francisco?

Yes — from March 1 through October 31. There are 16 fire rings between Stairwells 15 and 20, available first-come, first-served (6 AM to 9:30 PM). Bring your own wood, arrive early on weekends to claim a pit, and bring a bucket for ocean water to extinguish your fire. No fires on Spare the Air days.