Firefly 3K

JUN
13
2026
The Firefly 3K is a flat, paved 3 km course through The Morton Arboretum's scenic tree collections. You can run it in person or complete the distance virtually from anywhere. All in-person participants receive official race apparel.
Sat 13 Jun 2026
Firefly 3k

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Event Overview

The Firefly 3K is a 3 km running event held at The Morton Arboretum in Lisle, Illinois. It is part of a two-day Firefly Race Series, offering both an in-person and a virtual participation option.

Course Details

The course follows the main paved road on the Arboretum's East Side. It moves through the Arboretum's tree and plant collections and down Frost Hill. The route is described as relatively flat.

Participation and Fees

There are two ways to participate. The in-person Firefly 3K has a listed price of $40. The Virtual Firefly 3K has a price of $35. Member discounts are available. All participants in the in-person race receive branded Firefly Race Series apparel.

Virtual Option

For the virtual event, participants can complete the 3 km distance at a location of their choice and log their results online. Visit the organization's website for the most recent information.

Firefly 3k