The Annual Holstein 100 challenge ride takes place in Marin County, California on Saturday, August 16, 2014. It is great for riders of all ages. Routes vary in challenge ranging from a moderate 19 miles to difficulty of 100 miles. This event benefits West Marin Senior Services.
This year's ride takes place on Saturday, August 16 in beautiful Tomales, CA. We've got four great courses for you to enjoy — from 19 miles all the way up to a full century!