The 2019 Ironman swimming races will take place at Lake Sonoma.

2019 Ironman and Ironman 70.3

Suzie Rodriguez

This year Sonoma County will host two important triathlon races: Ironman Santa Rosa (May 11) and Ironman 70.3 Santa Rosa (July 27). Both events are major occasions in the triathlon world, bringing competitors and fans from around the globe.

At May’s Ironman Santa Rosa, entrants from every state in the nation and eleven countries will be competing for 40 qualifying slots at the 2019 Ironman World Championship in Kailua-Kona, Hawaii on October 12, 2019.

In July, competitors in the Ironman 70.3 Santa Rosa hope to win one of that event's 30 qualifying slots to the 2020 Ironman 70.3 World Championship to be held next year in Taupo, New Zealand.

Both Ironman and Ironman 70.3 offer plenty of athletic challenge and excitement, food, music, and many fun events—for racers, sure, but also for locals, visitors, and anyone who wants to watch and celebrate world-class athletes.

If you want to be there, this information will help you plan ahead:

A Brief Ironman Primer

Image of an Ironman competitor cycling.

Both Ironman Santa Rosa and Ironman 70.3 Santa Rosa consist of three traditional triathlon events: a swimming race, a bicycle race, and a running race. Events are completed in that specific order, back-to-back with no break.

For the May 11 Ironman, the competing distances are a 2.4-mile swim, a 112-mile bicycle race, and a 26.22-mile marathon. That's a total of 140.6 miles, sometimes referred to as a Full Ironman.

In July's Ironman 70.3, the traditional triathlon events of swimming, bicycling and running are half the distance of the Full Ironman, or 70.3 miles. The 70.3 is sometimes called a Half Ironman.

Both the May Ironman and the July Ironman 70.3 utilize the same courses, offering a spectacular wine country backdrop that will enthrall racers and spectators alike. The swimming races take place at Lake Sonoma; bicycles wend through Alexander, Russian River and Dry Creek Valleys; and the marathon and half-marathons are run along tree-lined Santa Rosa Creek trail. There are many beautiful locations for spectators who want to watch the action (see “Where to Watch,” below).

The festive finish line for both events: Santa Rosa's Courthouse Square, where the crowds will be primed for celebrating.

For Spectators

Image of an Ironman competitor running past a crowd.

To be at the center of events on race day for both Ironman and Ironman 70.3, head to historic Courthouse Square. That’s where you’ll find athlete-geared Ironman Village, along with great food and wine vendors, bike shops, the official Ironman store, and much else. In the surrounding streets are restaurants, antique stores, galleries, and even a California Welcome Center filled with maps, brochures and great advice on where to go and what to do in Sonoma County.

VIP Experience: A variety of passes offering convenience and dedicated viewing areas can be purchased, both for Ironman Santa Rosa and Ironman 70.3 Santa Rosa,

Where to Watch: If you’d like to watch the athletes in action, check out “What is the best place to watch the race?

Where to Park: Download a PDF of the Ironman parking map (the map is titled “Ironman 70.3,” but it works for both events).

Course Maps: Download maps for Ironman Santa Rosa and Ironman 70.3 Santa Rosa.

For Racers

Image of an Ironman competitor running.

In-depth information about the race, qualifying events, championship events, and a great deal more (including a comprehensive Athlete Guide for both the Full and Half Ironman races), is available on the official Ironman site: Ironman Santa Rosa and Ironman 70.3 Santa Rosa.


Ironman Santa Rosa (May 11): To learn about registration fees, payment plan options, and other information, visit this page.

Ironman 70.3 Santa Rosa (July 27): To learn about registration fees, visit this page.

Lodging for Spectators & Racers

Image of pool at Flamingo Conference Resort and Spa.
Flamingo Resort and Spa

Visit Santa Rosa has compiled a list of hotels offering discounted online rates for the May Ironman Santa Rosa. Please visit this page for more information.

Ironman Santa Rosa and Ironman 70.3 Santa Rosa, Courthouse Square, Fourth St. and Santa Rosa Ave., Santa Rosa.