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Kids Costumes
Transform your little trick-or-treaters into their favorite characters and classic monsters with comfy, high-quality outfits built for a full night of candy collecting.
Shop Kids Costumes →
Spook-tacular Celebrations
Everything You Need for a Frightfully Fun Halloween
From trick-or-treat prep to over-the-top party decor, find all the costumes, balloons, and favors to bring your spooky vision to life.
Halloween favorites at Diddams
Our Biggest Halloween
Selection Is In Store
Our website is only a peek. Visit Diddams to explore even more costumes, candy, decorations, glow accessories, party supplies, toys and unexpected Halloween finds for all ages.
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Adult Costumes
Make a statement at every party with adult costumes ranging from frightfully scary to laugh-out-loud funny.
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Halloween Balloons
Elevate your party with vibrant balloon arches, giant foil ghosts, and sinister custom bouquets that give your space an extra pop of festive fun.
Shop Halloween Balloons →
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Spooky Decor
Turn your home into the ultimate haunted mansion using our collection of eerie spiderwebs, glowing pumpkins, and festive porch displays.
Shop Decor →Diddams Daily Surprises
A little joy, every day.
Bring your child in for a FREE little surprise with any in-store purchase—no minimum. See today's goodie and pick a day to stop by this week. While supplies last.
Today's free goodie
A tiny surprise is waiting!
Make Diddams your happy stop. Pop in, find something you love, and take a little extra joy home.
Find your Diddams storePlan your happy stop
What's free this week?
Tap any goodie to see it up close!
One free goodie with any in-store purchase. No minimum purchase amount. While supplies last; the goodie may change if an item runs out.
“Diddams is my go-to for party planning and when I’m trying to make an experience special.”
They made the entire experience feel so easy—and I got all the credit!
Veronica“There is always something fun to discover.”
We come in for one thing and somehow leave with the perfect party idea.
Diddams Customer
“Absolutely love this store!”
Better supplies than Walmart and Target by far. We got 3 balloons at a reasonable price and they lasted more than a week! I actually still have the balloons two weeks out. My son loves them, not to mention the cool cups, plates, napkins, and tooth picks.
Baruch
“The staff was so fast and friendly!”
I was in a rush to get these balloons for a surprise and they got them blown up super fast for me! The store has a bunch of great selections too!
Sang Lee“THE GO TO PLACE FOR EVERY PARTY!!”
Family-owned store, with amazing vibes and service. Bumped into one of the owners who said to my kids to go on and keep touching, experimenting and have fun with the Halloween costumes and stuff!! A full session for Halloween: all kinds of costumes, hard to find items. Plus party supplies, candies, toys, balloons... Everything!!
MayumiBest birthday ever
Create Unforgettable
Birthday Memories
Build the whole celebration in one place—from the first balloon to the last candle on the cake.
Birthday Balloons
From grab-and-go bouquets to custom wow.
Party Themes
Tableware, decorations and details that pull it all together.
Milestone Birthdays
Celebrate the big numbers in a way they’ll remember.
Finishing Touches
Candles, favors, cake accessories and last-minute magic.
A Bay Area celebration tradition
For us, it’s all about
relationships.
Our culture is built on service, making people feel special and helping every celebration feel a little more personal.
We love being part of birthdays, holidays, school events, office celebrations and all the moments worth remembering.
33Years in the party industry
16M+Successful parties supported
4,500+Repeat balloon decor customers
Trending now
The kids party themes
everyone’s asking for.
Shop some of our most popular birthday themes right now—and check back as new favorites take over.
Trending now
K-Pop Demon Hunters
A bold, colorful party theme inspired by the hit phenomenon.
Shop the theme →
Trending now
Toy Story
Celebrate with Woody, Buzz and a party that goes to infinity and beyond.
Shop the theme →
Trending now
Spider-Man
A super-powered birthday theme for your favorite web-slinger fan.
Shop the theme →01 / 05
Come see us
Three stores.
One very fun place to shop.
Visit your neighborhood Diddams and see what’s new in person.
