The Heart of the Race Isn’t Just on the Course—It’s on the Sidelines

Every Memorial Day, thousands of runners flood the streets of Boulder for the iconic BOLDERBoulder 10K. But what really makes this event legendary isn’t just the finish at Folsom Field or the elite wave up front—it’s the spectators. The costumed supporters, homemade signs, spontaneous dance parties, and cheers echoing down each block make this race more than a run—it’s a celebration of community spirit.

Best Signs That Stole the Show

Year after year, Boulderites bring their A-game when it comes to signage. Some are clever, some heartwarming, and others downright hilarious. A few all-time favorites spotted over the years:

• “You’re NOT last! (But someone is…)”

• “Run like you’re late to yoga!”

• “Worst parade ever.”

• “This seemed like a good idea… six months ago!”

• “Smile if you peed a little.”

• “If Trump can run, so can you!”

Signs range from encouragement for strangers to inside jokes between family and friends. And every year, new gems appear—crafted with glitter, cardboard, and love.

Costumes That Deserve a Medal

It’s not just the runners showing off wild outfits—spectators go all out too. You’ll find entire families dressed as unicorns, superheroes, or fruit. Boulder’s creative energy is contagious, and the sidewalks become a parade of personalities:

• A brass band dressed as the Village People

• A group of grandparents wearing neon tutus and wigs

• Dogs in CU Buffs gear, tails wagging in rhythm to passing runners

• Kids with face paint, holding bubble machines to surprise runners at mile 4

One Boulder resident famously returns each year as Elvis, offering peanut butter and banana sandwiches to passing runners—yes, really.

Cheers Heard ‘Round the Course

In a city that thrives on movement and motivation, the cheers are what keep the race pulsing. No cowbell goes un-rung. No runner passes without hearing something shouted from a lawn chair. And the energy builds from the first wave to the very last.

• “Looking strong!”

• “You’ve got this!”

• “Free beer at the finish line!” (even if it’s not true—it works)

• “Go random stranger, go!”

These cheers come from families camped on coolers, college kids with signs, and seasoned locals who’ve been coming to the race for decades.

Why the Sidelines Matter

The BOLDERBoulder is famous for its runner experience, but it’s the community that lifts it into something truly unforgettable. While the 10K distance is a personal challenge, the crowd makes it feel like a shared journey. Spectators line the route not because they have to—but because they want to be a part of something magical.

The signs, the costumes, the cheers—they turn sidewalks into stadiums, front lawns into finish lines, and strangers into teammates.

So Here’s to You, Boulder.
To the moms with glittery posters, the dads blasting classic rock from front porches, the kids high-fiving sweaty strangers, and the neighbors offering orange slices and encouragement—you make race day unforgettable.

Whether you’re running, walking, or just watching from the shade—you’re part of what makes the BOLDERBoulder the best 10K in the country.

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