Sibby's Cupcakery

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Sibby's Cupcakery No substitutes, no shortcuts—with extra smiles on top! Voted Best Party Food by Bay Area Parent and the "center of the cupcake universe" by the Bay Guardian.
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Sibby's Cupcakery is a nut-free bakery specializing in classic and custom cupcakes made the old-fashioned way: crafted from scratch and baked fresh daily, using only the finest ingredients. We've been specializing in custom cupcakes made the old-fashioned way since 2004 . Baked to order from scratch using only the finest ingredients. No substitutes, no shortcuts. With extra smiles on top.

The 49ers are taking on the Commanders at Levi’s Stadium on Monday the 19th! 🏟️🔥 Get game-day ready with our 49ers-theme...
10/15/2026

The 49ers are taking on the Commanders at Levi’s Stadium on Monday the 19th! 🏟️🔥 Get game-day ready with our 49ers-themed cupcakes , the perfect sweet treat for your watch party or football celebration! 🧁❤️💛

❤️ Show your Niners pride! 🏈 Make your football party extra special!

📣 A little reminder: We are CLOSED on Mondays!

📞 Call to order your 49ers cupcakes today! ❤️💛🏈

Let’s go, NINERS! ❤️💛

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🎃 Oh my gourd! Another sweet ! 🍁Our little cupcake had a gourd-geous day at the pumpkin patch! 🧁🎃 Vivi and Jayden took...
10/14/2026

🎃 Oh my gourd! Another sweet ! 🍁

Our little cupcake had a gourd-geous day at the pumpkin patch! 🧁🎃 Vivi and Jayden took their Sibby’s plushie on a fall adventure to Spina Farms Pumpkin Patch in Morgan Hill, where it made some new friends, posed with pumpkins, and even had a close encounter with a T-Rex! 🦖😱

And apparently, King Kong has a sweet tooth, too! 🦍❤️

Where will our little cupcake pop up next? Take yours on an adventure and tag us with so we can follow the fun!



🎃🍂 Fall in Love, One Cupcake at a Time! 🧁🤎Say hello to our irresistible Pumpkin Spice Cupcake! 🍁✨ Filled with all the co...
10/11/2026

🎃🍂 Fall in Love, One Cupcake at a Time! 🧁🤎

Say hello to our irresistible Pumpkin Spice Cupcake! 🍁✨ Filled with all the cozy flavors of fall and topped with a dreamy ginger cream cheese frosting, then finished with an adorable little pumpkin for the perfect autumn touch. 🎃💛

Sweet, spiced, and oh-so-perfect for the season! 🍂 Whether you’re treating yourself or sharing with loved ones, this little cupcake is a taste of fall in every bite. 🧡





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“🧙‍♀️🎃 A Little Witchcraft, A Lot of Sweetness! 🧁✨Witchy, spooky, and oh-so-cute! 🖤💜 These Halloween-themed cupcakes are...
10/10/2026

“🧙‍♀️🎃 A Little Witchcraft, A Lot of Sweetness! 🧁✨

Witchy, spooky, and oh-so-cute! 🖤💜 These Halloween-themed cupcakes are the perfect magical treat for kids’ Halloween parties, school celebrations, and all your spooky festivities! 👻🕷️

✨ Made to add a little magic to your Halloween table! 🧙‍♀️ Cute enough to love, spooky enough to thrill!

🎃 Call to order today! Let’s make your Halloween party extra sweet with these spellbinding cupcakes! 🧁🔮





🏈 🌉 NINER GANG! 🌉 🏈 We have a HUGE game coming up on Sunday, October 11 against those pesky Seattle Seahawks—and the gam...
10/09/2026

🏈 🌉 NINER GANG! 🌉 🏈 We have a HUGE game coming up on Sunday, October 11 against those pesky Seattle Seahawks—and the game is IN Seattle! 😱 Our boys will need all the good Bay Area juju we can muster for them, and around here, that means one thing: 49ers cupcakes! ❤️ Give us a call today to place your order for custom game-themed cupcakes, and don’t forget, we close at 2pm on Sundays!



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🏀💜 WE’RE FEELING VALKYRIE VIBES! 💜🏀The Golden State Valkyries are bringing the heat to Vegas tonight for Game 3 of the W...
10/09/2026

🏀💜 WE’RE FEELING VALKYRIE VIBES! 💜🏀

The Golden State Valkyries are bringing the heat to Vegas tonight for Game 3 of the WNBA Semifinals! 🔥 One more win and it’s off to the FINALS! 🏆

We’ve got the cupcakes to match the excitement! Swing by Sibby’s today and grab some sweet treats to cheer on our hometown heroes! 💜🖤

Available in-store TODAY while supplies last!

LET’S GO VALKS! 💪💜🏀

It’s back: Jimmie Cake! 🤎🤍🤎🤍 This October flavor features fluffy vanilla cake with chocolate jimmies baked in, topped wi...
10/07/2026

It’s back: Jimmie Cake! 🤎🤍🤎🤍 This October flavor features fluffy vanilla cake with chocolate jimmies baked in, topped with a swirl of vanilla buttercream and chocolate fudgy frosting, and sprinked with more jimmies on top. The best of both worlds!





✨🖤 Midnight Magic is back for October! 🖤✨ It features 5 layers (!!!) of chocolatey goodness: chocolate cake filled with ...
10/04/2026

✨🖤 Midnight Magic is back for October! 🖤✨ It features 5 layers (!!!) of chocolatey goodness: chocolate cake filled with chocolate Swiss buttercream, topped with fudgy frosting, dipped in ganache, sprinkled with our homemade chocolate cookie crumbs, and dusted with silver stars. 😍🍫 It’s a chocolate lover’s dream come true!





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🇬🇷 PLUSHIE SIGHTING! 🇬🇷 This plushie was livin’ the good life in Santorini—seen here enjoying a made-to-order breakfast ...
10/03/2026

🇬🇷 PLUSHIE SIGHTING! 🇬🇷 This plushie was livin’ the good life in Santorini—seen here enjoying a made-to-order breakfast before a day of lounging by the pool. It’s a tough life, but someone has to do it! 😉 Let us know where your plushie has been with the hashtag and tag us, too—your plushie could be featured on our Instagram! 👀

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Address

716 S Railroad Avenue
San Mateo, CA
94401

Opening Hours

Wednesday 10am - 5:30pm
Thursday 10am - 5:30pm
Friday 10am - 5:30pm
Saturday 10am - 5pm
Sunday 10am - 2pm

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