The Greenville Spinners keep a great listing of local weekly rides here.
Much of the U.S. would disagree that it's "Spring", but plenty of action in Greenville with another round of the Spring Series. A healthy variety of courses this year.
Plenty of road events on the calendar, but cyclocross is creeping in.
Plus Para Championships the end of August:
North Charleston hosts two days of Criteriums on March 29th and 30th.
Low Country Racing has the details of the Park Circle Criterium Weekend on their website
December 15th is a bit early for Rudolph to arrive pulling the jolly fat man, but maybe he'll use the rampage to tune up.
Mountain bike racing at Harbison Forest: FLYER