Firefly 3K takes place on Jun 19, 2026. That's in 3 weeks.

Where is Firefly 3K located?

Firefly 3K is held in Lisle, Illinois, United States.

What distances are available at Firefly 3K?

Firefly 3K offers the following distances: 3K.

How do I register for Firefly 3K?

You can register for Firefly 3K through the official registration page.

What is the typical weather for Firefly 3K?

Based on historical data, you can expect temperatures between 61°F and 85°F on race day. There's approximately a 18% chance of precipitation.

Firefly 3K (3K) - Jun 19, 2026 | Lisle, IL

Lace up for an enchanting evening at the Firefly 3K, set for Friday, June 19, 2026, in picturesque Lisle, IL. This unique twilight event transforms The Morton Arboretum into a glowing spectacle, offering runners and walkers a magical "after-hours experience" as the sun dips below the horizon. The course, described as "relatively flat" and "mostly flat," follows the main paved road on the Arboretum's East Side, winding through stunning tree and plant collections and down Frost Hill, making it ideal for all experience levels, including those with strollers or wheelchairs.

The Firefly 3K is more than just a race; it's a celebration. Starting at 8:00 p.m., participants can enjoy "stunning sunset views" before joining a "lively post-race party" complete with "glow lights," a "DJ," a "disco ball," "blacklights," and refreshing beverages. All participants will also receive exclusive branded Firefly Race Series apparel. With typical race day conditions seeing highs around 85F and lows around 61F, and only an 18% chance of precipitation, the evening promises comfortable running weather for this festive community event.

Whether you're a seasoned runner looking for a fun evening out or a beginner seeking an approachable first race, the Firefly 3K offers a memorable experience. While not a competitive race with individual awards, it's a perfect opportunity to enjoy the beauty of The Morton Arboretum at dusk and be part of a vibrant, supportive atmosphere. Join the Firefly 3K for an unforgettable blend of fitness, scenery, and celebration, all while supporting the Arboretum's mission for a greener, healthier world.