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Boulder Colorado’s Best Last-Minute Halloween Costume Ideas

When Halloween sneaks up on you faster than a CU Buff charging the field, don’t panic—Boulder’s got you covered. From Pearl Street’s quirky boutiques to your own closet, there are countless ways to pull off a costume that’s festive, funny, and oh-so-Colorado.

The Pearl Street Mall is always buzzing this time of year with last-minute shoppers and street performers who look like they’ve been rehearsing their costumes since July. But even if you’ve waited until the eleventh hour, these Boulder-inspired ideas will help you create something memorable in minutes.


1. The Boulder Witch or Wizard

Grab a black dress, hiking staff (yes, staff, not broom), and add some eco-friendly glitter. Instead of a cauldron, carry a reusable coffee cup from one of Boulder’s many local cafés—it’s the perfect blend of mystical and mountain-modern.

2. The Surfer Ghost

Throw on a white sheet, board shorts, and sunglasses. Whether you’re haunting the Flatirons or floating down Boulder Creek, this spooky surfer is a quick DIY win that always gets a laugh.

3. The Retro Tourist

Button up that loud Hawaiian shirt, grab a camera, a CU Buffs map, and wander Pearl Street snapping selfies. Bonus points if you add socks with sandals and a visor for full authenticity.

4. The Bookstore Vampire

For the literary-inspired, dress in black, carry a novel from Boulder Bookstore, and practice your best “I vant to read your mind” impression. A hit with the downtown crowd every year.

5. The Coffee Barista Witch

Black jeans, an apron, a witch’s hat, and a to-go coffee cup—simple, trendy, and fits right in at any of Boulder’s iconic coffee spots.

6. The Hiker Monster

Toss on your hiking boots, smear a little dirt, add fake moss or leaves, and boom—you’re the creature that lives near Chautauqua. Perfect for outdoor lovers who want something creative yet simple.

7. The Street Performer Zombie

Boulder’s Pearl Street entertainers are iconic. Tatter your clothes, use pale face paint, and join the fun. You’ll fit right in among the jugglers and musicians—just moan instead of sing.

8. The Lost Alien on Vacation

Silver outfit, camera, lei, and a confused look. “Take me to your nearest juice bar!” works great as your alien catchphrase.


Whether you’re heading to a Halloween party, downtown celebration, or just handing out candy from your porch, these last-minute costume ideas are easy to create, Boulder-themed, and guaranteed to bring a smile. And if you find yourself wandering the Mall, don’t be surprised if you become part of the entertainment—after all, in aboutboulder.comfashion, creativity and community always take center stage.

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