Trillium Women's Only Event

JUL
12
2026
Join this all-female triathlon and duathlon event at Centennial Quarry in Sylvania. Choose between individual races or team relays featuring swimming, biking, and running in a supportive environment.
Sun 12 Jul 2026
Triathlon Relay Triathlon Duathlon Relay Duathlon

Always double-check with the organizer's website! This page may contain affiliate links.

Trillium - A Women's Only Event

Trillium is a multi-sport competition held in Sylvania, Ohio, designed specifically for female participants. This USAT sanctioned event has taken place since 2005 and features both individual and relay categories for triathlons and duathlons. The race is hosted at Centennial Quarry and is open to various age groups depending on the specific event.

Participants in the triathlon start two-at-a-time in a time trial format from the steps of the Centennial Quarry. The event offers several different race structures to accommodate different preferences:

  • Triathlon: 400 meter swim, 11 mile bike, and 5k (3.1 mile) run.
  • Duathlon: 1 mile run, 11 mile bike, and 3.1 mile run.
  • Triathlon Relay: Three-member team (one swimmer, one biker, and one runner).
  • Duathlon Relay: Two-member team (one person performs both runs, another bikes).

The individual triathlon and relay events are open to participants aged 15 and older, while the individual duathlon is open to participants aged 12 and older. As a USAT sanctioned race, the event follows the safety and fairness standards established by the national governing body for multisport. Visit the organization's website for the most recent information.

Triathlon Relay
Triathlon
Duathlon Relay
Duathlon
Add Event
Help us complete the calendar!
  • Distance is at least 5 km
  • Event has a website or Facebook page
Website
Optional: Please provide your e-mail address if we may contact you.
Report a change
We will only update the data if the information is also on the website.