Ryan held a rally Friday at the Black Canyon Jet Center in Montrose. He will also be in Iowa and Ohio.
Numbers released Thursday by the Colorado secretary of state shows 1.3 million people already have voted, including 38 percent of the Republicans and 35 percent of the Democrats.
President Barack Obama spoke to about 10,000 people in Boulder on Thursday.
Vice President Joe Biden and Republican presidential nominee Mitt Romney also plan stops in Colorado in the coming days, and Obama is expected to return to Colorado on Sunday.
(Copyright 2012 by The Associated Press. All Rights Reserved.)