A 140-mile course with 14,000 feet in elevation gain makes the Saturn Cycling Classic, from Boulder to Breckenridge, Colorado, one of North America's toughest one-day races. Watch elite amateurs pedal up seven mountains and ditch their slicks for knobby tires as they tackle the drop down 11,671-foot Guanella Pass.
August 1-4 More than 35 bandsÂ—and thousands of roots- music fansÂ—camp, party, and pick under the midnight sun at Alaska's TALKEETNA BLUEGRASS FESTIVAL, where the music keeps playing 20 hours a day. www.talkeetnabluegrass.com
August 6-11 Eight hundred paddlers converge on Dartmouth College's Ledyard Canoe Club for the NATIONAL MARATHON CANOE AND KAYAK CHAMPIONSHIPS. The signature event: a 12-mile race down New Hampshire's Connecticut and Ompompanoosuc Rivers.
August 30-31 The CLIFF DIVING WORLD CHAMPIONSHIPS bring 12 of the world's top international high-divers to Lanai, Hawaii, to compete for a $50,000 prize as they twist and spin at speeds of up to 65 miles per hour off an 85-foot precipice.