ADVENTURE RACING
May 12
Buena Vista Adventure Xstream Adventure Race; sprint or 12-hour courses; features mountain biking, whitewater kayaking, orienteering, trail running and a Tyrolean traverse. gravityplay.com or 970-259-7771
June 2-3
GNC Ultimate Mountain Challenge; in Vail; cross country mountain bike, road bike time trial, 10K trail run, class II kayak; solo or team; $100 solo, $150 teams. tevamountaingames.com
CLIMBING
May 1
Evenings with DIVAS; free climbing clinic; in Boulder; 7 p.m. outdoordivas.com
June 1-2
Volkswagen Bouldering Competition; in Vail; pros’ and citizens’ competition; all ages and abilities; $30. tevamountaingames.com
CYCLING
Mountain and road
Thursday-Sunday
12th New Belgium Brewing Fruita Fat Tire Festival; in Fruita. fruitamountainbike.com or 970-858-7220
Saturday
International Mountain Bicycling Association Trail Building School; learn to build and maintain local trails; includes classroom and field instruction; covers basic construction, sustainable trail design, turns and drainage and bridges, reroutes, reclamation and rock work. Also, Trails 2000 will celebrate National Trails Day on June 2 and host Elbert Creek trail work with the Backcountry Horsemen on June 16. trails2000.org or 970-259-4682
Sunday
Seventh Alien Run Mountain Bike Competition; in Hart Canyon, home of the alleged Aztec UFO crash; 25-mile course circles the crash site; $25 to $30; 10 a.m. azteclibrary.org/bike/competition.htm
May 3
Spring Mountain Biking Series at Hartman Rocks; weekly, each Thursday in May; with the Gunnison Valley Bicycle Club; at the multi-use recreation area west of Gunnison; all levels welcome; 5:15 p.m. 970-275-2573
May 11-13
Mountain Biking Singletrack Sampler; three days on a singletrack near Fruita, with individual instruction from professional bike coach and trainer Rhonda Mayo; for beginning and intermediate riders; covers foundational and technical skills; $435. womenswilderness.org or 303-938-9191
May 13
Babes in the Backcountry single and multiday mountain bike clinics; with instructors from RipStoke; one-day options available July 14 and Aug. 11; at White Ranch; also June 16, July 13-15 and Aug. 10-12 in Breckenridge; $130-$350. babesinthebackcountry.com or 970-453-4060
Ongoing
Road bike rides every Saturday and Sunday along the Front Range, sponsored by Colorado HeartCycle; 20 to 100 miles; weather permitting; helmet required. heartcycle.org
Mountain bike camps, private lessons and clinics with Better Ride; for recreation riders and racers; focus on core skills, balance, vision, cornering, energy management, obstacles, drops, etc.; women’s camp in Fruita, Saturday-Monday; Series 2 mountain bike camp in Fruita, May 5-7; Denver cross country race camp, May 20-22. betterride.net
Ride the ski slopes all summer; chairlift rides at Crested Butte Mountain Resort are available to bikers and hikers; trails include rolling singletrack to more advanced technical terrain; all ages; lifts open in mid-June through mid-August. skicb.com or 970-349-2262
DISC GOLF/ULTIMATE FRISBEE
May 19
Ultimate Frisbee pirate-themed social mixer; at Stazio Softball Fields in Boulder; hosted by Grass Roots Ultimates; all skill levels; four games on random teams; food, beverages, prizes; 9 a.m. to 6 p.m.; $13. gasm2007.googlepages.com or gasm2007@gmail.com
HIKING
May 5
Guided Bird Walks; May 5 at High Line Canal, June 9 at Red-tail Park and July 7 at Sand Creek Park; learn what types of birds live in Highlands Ranch; with a district park ranger; $6 to $7; 7-9 a.m. highlandsranch.org or 303-791-2710
Guided Hike: Ravens Reign at the Devil’s Backbone; two-hour hike west of Loveland; learn the importance of native ravens on the Key Hole Trail; easy rating; 5 p.m. larimer.org/parks
Healthy Trails, Healthy People Volunteer Trail Adoption Projects; with the Larimer County Horseman’s Association; tools, training and supervision provided; work on the Devil’s Backbone Trail; free lunch. 970-679-4552 or dflahavhan@larimer.org
May 11
Blue Mountain Conservation Area Tour; features Chimney Hollow; 8:30 a.m.; a six-hour tour with the Larimer County Open Lands Program and the Northern Colorado Water Conservancy District; limited to 12 people; moderate difficulty. larimer.org/parks
May 12
Wildflowers Trail Hike; a three-hour tour at Horsetooth Mountain Park, beginning at the original trailhead, west of Fort Collins; with a mountain park guide; part of a six-hike series looking at springtime flowers; easy to moderate; 9 p.m. larimer.org/parks
May 13
Mother’s Day at Eagle’s Nest Hike; a three-hour tour at Livermore north of Fort Collins; with a naturalist guide; see nesting eagles; easy to moderate hike; 9 a.m. larimer.org/parks
Ongoing
Open Space and Mountain Parks volunteer trail guides; Boulder Open Space and Mountain Parks (OSMP) is recruiting volunteers as trail guides; six to 10 hours per month; free classroom and field training provided in four required sessions. osmp.org or 720-579-4161
Bird watching tours with Colorado Division of Wildlife; weekends through April; in Wray; see greater prairie chicken courtship dances; reservation required. wraychamber.net/prairiechicken.html
Work the Colorado Trail; trail work and other volunteer tasks; from single day to weeklong, June to August; by the Colorado Trail Foundation. coloradotrail.org
Trail work with Trails 2000; build and maintain trails and educate trail users; volunteers needed to do trail work. trails2000.org
Ongoing
Guided backpacking trips from Altitude Adventures; overnight and three-day trips; $200. 303-499-1100 or altitudeadventures.com
KAYAKING
May 29
East vs. West Amateur Kayak Rodeo; in Avon; team kayak rodeo contest between Front Range and Western Slope teams; at Whitewater Park; $20. tevamountaingames.com
Ongoing
Lessons and open pool sessions hosted by Golden River Sports; Tuesdays and Thursdays, 6:30-8:30 p.m.; reservations required; Golden Recreation Center. 303-215-9386
Open pool session and beginner and expert lessons hosted by Confluence Kayaks; 8-10 p.m. Tuesdays; lesson with gear, $45, open pool access only, $10; reservations required; University of Denver’s El Pomar Natatorium, 2201 E. Asbury Ave. 303-433-3676 or confluencekayaks.com
Open pool session hosted by Pikes Peak Whitewater Club and Colorado Kayak Supply; 5-7 p.m. Sundays; introductory lessons from 3-5 p.m.; Cheyenne Mountain High School pool, 1200 Cresta Road, in Colorado Springs. pikespeakwhitewaterclub.com
RUNNING
May 6
Toyota Benefit Running Series; Cinco de Mayo 10K Run and Fun Walk; at CSU-Pueblo/State Fair Grounds in Pueblo; $30-$45; 8 a.m. starts. twolves.colostate-pueblo.edu/benefit/index.asp
May 12
Columbine High School Run For Remembrance; 5K competitive run and 5K fun run/walk; more than 900 runners last year; in Littleton; $25; 8 a.m. jeffcoweb.jeffco.k12.co.us/high/columbine or active.com
May 19
Mike the Headless Chicken 5K; part of Fruita’s Mike-the-Headless-Chicken Days; in Fruita; 9 a.m. fruita.org or 970-858-0360
Spiral Drive 4-mile run; in Salida; 10 a.m.; run up and down Tenderfoot Mountain. salidarec.com/ccrc or 719-539-2503
May 20
Miles for Smiles 5K run/walk; at the new Broomfield Commons Park; on mostly open space trails; $13 to $25; 9 a.m. twoangelsfoundation.org
Nov. 10
Mesa State 37K RimRock Run; gate to gate through the Colorado National Monument, outside Grand Junction; 8 a.m. rimrockrun.org or 970-243-4055
Ongoing
Dash and Dine 5K No. 1; in Boulder; part of a 5K race series every Tuesday through May 15; starts at Coot Lake; $15 to $20; official Bolder Boulder qualifier; 6:30 p.m. 303-939-8000
TRAIL RUNNING
Saturday
Garfield Grumble 5-mile Trail Run; begins at Garfield Trailhead outside Palisade, climbs more than 2,000 feet, then descends; advance trail; $5; 8 a.m. 970-245-4382
May 5
Girls-on-the-run 5K; part of national GOTR series; at Matchett Park in Grand Junction; open to females of all ages; $15 to $25; 9 a.m. 970-257-9267 or info@girlsontherungv.com
May 12
South Suburban’s 26th High Line Canal Run and Walk; 10K run or 5K run/walk; Bolder Boulder qualifier; at deKoevend Park in Littleton; all ages; $20 to $25; 8 a.m. sspr.org or 303-798-7515
May 20
La Sportiva Front Range Trail Frenzy Series; includes five races: Saturday, Chatfield 7.5-mile; May 20, Castlewood Canyon 6.5-mile; June 23, Buffalo Creek 12K; July 21, Golden Gate Canyon Trail Run 12.7-mile; Aug. 12, Lookout Mountain Hill Climb 4.5-mile; $60-$90; 8 a.m. runuphillracing.com
SAILING
May 31-June 3
SAIL sailing class for beginners; intense, four-day, 40-hour course covers psychology, lesson planning and on-the-water techniques; all levels; at Cherry Creek Reservoir; $280-$300. ussailing.org or 303-757-7718
Ongoing
Colorado State Parks boating safety classes; at various locations; open to adults and teens; includes a home-study manual, a two-hour classroom review and a written exam. parks.state.co.us
BACKCOUNTRY SKIING
May 4-6
Backcountry ski mountaineering hut trips to Summit County; for advanced intermediate and better; telemark, alpine or snowboard, women only; must have previous backcountry experience; includes breakfast and dinner at the hut, lodging, snacks, backcountry safety equipment and guided instruction, and morning yoga; $350. 970-453-4060 or babesinthebackcountry.com
SKIING/SNOWBOARDING
Saturday
Corn Harvest Benefit Ski Party at Loveland Ski Area; for the Colorado Avalanche Information Center. skiloveland.com
TRIATHLON/DUATHLON
June 5
Evenings with DIVAS; free triathlon clinic; in Denver; 6:30 p.m. outdoordivas.com
LECTURES/CLASSES
Ongoing
Maps, Compasses and Orienteering class; a U.S. Geological Survey-hosted class; free; 1 p.m., first and third Fridays of the month at REI Denver flagship store, 1416 Platte St. rei.com
Outdoor discussion with Altitude Adventures staff; topics include high-altitude sicknesses, trip planning and compass reading and what to do in emergency situations. altitudeadventures.com or 303-499-1100
MISCELLANEOUS
May 11-13
Boulder Adventure Film Festival; at the Dairy Center for the Arts and the Boulder Theater, in Boulder; an international film series and forum for independent adventure films. bouldertheater.com or thedairy.org
SKI AREA CLOSING DATES
May 2 – Silverton
May 6 – Loveland
June 5 – Arapahoe Basin
