To get an event listed in the calendar, send your information 14-21 days in advance to: OEcalendar@denverpost.com or fax 303-866-9004. Be sure to include a contact number. Items will run on a per-space basis.
ADVENTURE RACING
Friday-Saturday
Colorado Outward Bound Ultra Relay; a 24-hour, 170-mile team relay race; for all abilities; Idaho Springs to Glenwood Springs, across three mountain passes; teams average 10 runners and two volunteers, with each leg averaging 6 miles. www.outwardboundrelay.com
Saturday
Fort Collins adventure race; at Horsetooth Reservoir, in Fort Collins; men’s, women’s and coed; $100; 9 a.m. havingfuninc.com
Vail AdventureXstream Adventure Race; sprint and 12-hour courses; mountain biking (12 to 18 miles), kayaking (5 to 8 miles), trail running (4 to 6 miles) and navigation; $75 to $175. gravityplay.com
CLIMBING
Sunday
Divas rock out: women-specific class for beginners; in Boulder area; covers basics of climbing; 8 a.m. to 3 p.m.; $149. outdoordivas.com
CYCLING
Mountain and road
Friday-Sunday
Pedal the Prairie; three-day rustic bicycle tour on the Eastern Plains; in Fort Morgan; course is mostly on dirt and gravel roads, past the Pawnee Buttes, Jackson Lake and the Pawnee National Grasslands; $180. www.fortmorganchamber.org
Saturday
Ride For the Cure; at Paepcke Park, in Aspen; a challenging 100-mile route through Aspen; shorter, flatter routes available; a 23-mile loop from the Woody Creek Tavern to St. Benedict’s Monastery and back; fully supported; 8 a.m. www.aspenrideforcure100.com
Chaney King Bike Ride and Run; at the Air Force Academy; metric 100, 30-mile, 15-mile, biathlon (15- or 30-mile ride and 10K run), or 10K run on the cadet trail; $50; 7:30 a.m. www.falconfoundation.org
Crested Butte September Century Bike Tour; in Crested Butte; 100- and 50-mile tour options; $40-$45; 8 a.m. www.cbnordic.org
Saturday-Sunday
11th Beaver Meadows MTB Festival; mountain bike races at Beaver Meadows Resort, in Red Feather Lakes; three disciplines: cross country, short track and downhill; for collegiate and NORBA in categories from beginner to pro; $20-$50. www.ramscycling.com
The Kona 24-Hour Global Series bike race; in Snow Mountain Ranch; men and women, solo, duo and team; 2 p.m.; $230 to $490. sleeplessinthesaddleusa.com
Sunday
Gray Head Gold Rush; vertical cross country mountain bike race; at Gray Head Wilderness Preserve, in Telluride; $30; 9 a.m. catsman.com/grayhead
TIAA-CREF Buffalo Bicycle Classic; Boulder area; 13-, 35-, 50-, 72- and 100-mile courses; fully supported; $60-$85. buffalobicycleclassic.com or 303-735-1569
DISC GOLF
Friday-Sunday
Snow Mountain Challenge; in Fraser at the YMCA Snow Mountain Ranch; PDGA sanctioned. deeppdrskee@hotmail.com
HIKING/BACKPACKING
Saturday
21st Pikes Peak Challenge; hike Pikes Peak; at Barr Trail, in Manitou Springs; $35. pikespeakchallenge.com
RUNNING
Wednesday
Class Challenge 5K; a cross country race on grass, dirt trails, bike path and a moderate hill; 6 p.m. eclecticedgeracing.com
Chamber Challenge 5K; at Metro North Chamber of Commerce, in Westminster; solo $25, team $100; 6:30 p.m. metronorthchamber.com
Saturday
Imogene Pass Run; a grueling 17-mile foot race over Imogene Pass, a 4-wheel drive road, for serious athletes only; Ouray to Telluride; $50; 7:30 a.m. www.imogenerun.com
Northglenn Paint The Town 5K Run/Walk; in Northglenn; course officially certified by USATF; $12-$20; 7:45 a.m. 303-450-8800 or active.com
Spur of the Moment 5K; at Junior Legion Park on River Trail, in Grand Junction; 8:30 a.m. mmstriders.org
Cops Fighting Cancer 5K; run or walk; at Aurora Municipal Court, in Aurora; $10-$25; 9 a.m. 303-877-8534 or active.com
First American State Bank Fitness Festival 5K; in Greenwood Village; $15-$30; 9 a.m. fasbfitnessfestival.com
18th Road Kill Trail Half Marathon and 10K; at Kremmling Town Square, in Kremmling; on private property, dirt county road and Red Mountain public lands, and consists of rolling single- and double-track terrain; one major hill climb; walkers welcome on the 10K; $15-$25; 9:30 a.m. runningseries.com
Spur of the Moment 5K; at Legion Park on Grand Junction Riverfront Trail; 8:30 a.m. 970-243-3721 or 970-640-2746
Sunday
DDRC Harvest Festival 5-mile and 3-mile Run/Walk; during the 81st Arvada Harvest Festival; at North JeffCo Park, in Arvada; on the bike paths and neighborhoods of Arvada; USATF certified and an official 2007 Bolder Boulder qualifier; $20 solo, $45 family; 8 a.m. ddrcco.com/06Run.htm
Fort Lupton Trapper Days 5K; 5K run/walk predict race at Koshio Park; USATF certified and a 2007 Bolder Boulder qualifier; in Fort Lupton; $20; 7 a.m. fortlupton.org
Flying Horse Fling 5 Miles, 5K and Kids Run; at Douglas County Events Center, in Castle Rock; $15; 8:30 a.m. 303-694-2030 or active.com
Neder-Nederland 5K and 10K; at Nederland High School, in Nederland; $10-$18; 9 a.m. www.nederlandchamber.org
Teva EverGold 10K; in Vail; $25; 10 a.m. www.vailrec.com
13th annual El Grito 5K Run and Walk; at Buckhorn Exchange, in Denver; $16; 9 a.m. 720-840-8127
Golden Demon Dribble Dash 5K; at Golden High School; 8 a.m. slubkeman@mheco.com
TRAIL RUNNING
Saturday
12th Kremmling Roadkill Trail Races; trail half-marathon and 10K; rolling single- and double-track terrain, with one major hill climb; walkers welcome on the 10K; at Kremmling Town Square, between Silverthorne and Steamboat Springs; 9:30 a.m. kremmlingchamber.com or 877-573-4302
Sunday
NO 02 10K; in Leadville; the highest 10K race in the United States, reaching 10,608 feet; through the historic mining district on the east side of Leadville; run on asphalt, dirt roads, bike trails and the old abandoned narrow gauge railroad grade; $15, 17 and younger free; 9:30 a.m. 719-486-5317, Leadville-sports@hotmail.com
TRIATHLON/DUATHLON
Wednesday
Surf & Turf Aquathon; finale of six-race series; at Chatfield State Park, Gravel Pond, in Littleton; $27; short course: 500-meter swim, 5K trail run; long course: 1,500-meter swim, 5K trail run. aquathonusa.com
Saturday-Sunday
24 Hours of Triathlon; short course, solo and team relay; swim, bike, run for 24 hours; in Boulder. 24hoursoftriathlon.com
Sunday
Fall Frenzy Triathlon/Duathlon; in Parker; triathlon: 500-yard pool swim, 13-mile bike, 3-mile run; duathlon: 3-mile run, 13-mile bike, 3-mile run. fallfrenzy.com
MISCELLANEOUS
Saturday
Adopt-a-Crag Service Project; at Castlewood Canyon State Park; just south of Franktown; 3 p.m. voutdoors.org, jfox@rei.com or 303-858-1726
