Jesse Thomas and Heather Jackson are big favorites to repeat at the classic, rugged long course Wildflower Triathlon Saturday. Seventy five elite pros and nearly 7 thousand more age groupers will take part in four big events over the weekend in the 31st edition of Terry Davis's great triathletic idea widely known as the Woodstock of Triathlon.

All photographs © Timothy Carlson

Friday kids' racers charge down the finish chute.

One of the gorgeous vineyards near the Wildflower bike course.

Defending champion Jesse Thomas contemplates a 2011-2012-2013 three-peat.

Tri-California announcer Julie Moss chats with defending champion Heather Jackson and her fiancé Sean Watkins.

Lake San Antonio water were measured at 71 degrees - too warm for pro wetsuits, legal for age groupers.

Clayton Fettell finished 2nd to Jess Thomas here in 2011.

Chiropractor taps a patient on the elbow.

Young fan flips out on a sunny day at Lake San Antonio.

Joe Gambles waits for race wheels that arrived via a triathlon transport service..

Tenille Hoogland hopes top her 4th place finish in 2011.

Posers.

Multi-time competitor Rachel Challis with her children Gus and Chloe, who sported cool Ryan Lochte sunglasses.

Competitor asks a question at the pro meeting.

Paul Ambrose looks calm

Boulder pros Allen Gardner and Kirsten Peterson.

Leon Griffin, 2006 ITU Duathlon World champion, sports a Spy T shirt.

Elite contender Matthew Russell.

Michellie Jones, who will announce the race, models some fashionable compression socks.

Harriet Anderson, the great Ironman Hawaii age group champion, is also a fan. Here she gets Jesse Thomas's autograph.

A small boat cuts a sharp wake on Lake San Antonio's glassy surface.