You won’t expect your next nature obsession to be mostly underground, but that’s the point: the heart of the Humongous Fungus is a massive subterranean organism of Armillaria gallica, discovered in the late 1980s, covering roughly 37–38 acres near Crystal Falls.
Since 1991, this quirky and beloved fungus has been honored with an annual festival in Crystal Falls, bringing together locals and visitors alike for two days in August of music, food, contests, and fun all themed around this giant organism.
Expect something equal parts scientific oddity, hometown pride, and summer carnival—with mushrooms (yes, literal mushrooms), giant pizza, and a parade.
Key Highlights You’ll Want to Experience
One of the signature draws is the Humongous Pizza—a 10-by-10 foot mushroom pizza made during the festival, often topped with mushrooms sourced locally or inspired by the festival’s fungal star.
Festival goers also praise the Parade & Vendor Village for its eclectic mix: mushroom-themed floats, vintage cars, art vendors, street food stalls, and t-shirts that sell out quickly. Music, local artisans, and community contests (like Best-Dressed Mushroom) give off a delightful small-town vibe.
For those curious about the science behind the fun, the size, age, and nature of the fungus are endlessly fascinating. The organism is estimated at 1,500 to 2,500 years old, and while most of its mass lies underground (rhizomorphs and fungal network), the fruiting bodies above ground are modest.
Other fun festival events include pie-eating contests, art walks (sidewalk chalk), car shows, softball or similar tournaments, and nostalgic community traditions like pancake breakfasts and rummage or yard-sales tied into the festival weekend.
Atmosphere & Character
You’ll find the atmosphere warm, relaxed, and quirky. The setting is a small Upper Peninsula town leaning into its unusual claim to fame. Much of the action happens outdoors—parade route through downtown, vendor booths along main street, local eateries opening up, and nostalgic “Pie Socials” that feel like stepping back in time.
Even though the festival celebrates something massive, it’s grounded in simplicity: casual clothing, friendly competition, communal meals, and the beauty of rural Michigan summer. It’s not slick or overproduced, which many visitors find part of its charm.
Other Considerations
So how’s the price? Entry to many of the festival events is free or low-cost. Certain special events, food, vendor items, or guided tours may cost extra. Overall you’ll feel you’re getting value because much of the charm comes from experiences rather than ticketed spectacle.
Will you see the “big fungus”? If you hope to gaze upon towering mushrooms like something out of a fantasy film, adjust expectations. The organism exists mainly underground; what you’ll see above are small fruiting bodies (“buttons”) occasionally visible, depending on the season.
Best time to visit? The festival is held in August, when the weather tends to be good and the event schedule is full. It’s also when many of the activities (parade, vendors, food, etc.) are active. Early in the day tends to be less crowded.
What about parking / getting around? Crystal Falls is a small town, so walking from downtown lodging is feasible during the festival. Rush times around popular events like the parade or big food offerings can lead to congestion. Staying local and arriving early helps.
Is it family-friendly? Very much so. Many festival goers enjoy bringing kids for the parade (candy tossing), games, dessert socials, and the novelty of the theme. Many of the events are gentle (parade, vendor walks, costume contests) rather than high intensity.
You’ll leave the Humongous Fungus Festival with more than just funny photos in mushroom costumes—you’ll carry memories of community warmth, quirky nature wonder, and the realization that something extraordinary can live mostly unseen beneath your feet.
Humongous Fungus Festival
📍 Crystal Falls, Michigan
Website: Crystal Falls Humongous Fungus Festival Facebook Page
