If you go

What: 16th annual Circle Boulder by Bicycle

When: 3-4 p.m. Sunday

Where: Scott Carpenter Park at 30th Street and Arapahoe Avenue, Boulder

Info: walkandbikemonth.org

Boulder's Walk and Bike Month

Selected events for June's Walk and Bike Month in Boulder. See full calendar at walkandbikemonth.org.

Circle Boulder by Bike: Sunday

Boulder Creek Path Bicycle History Tour: Thursday

Speaking For Cyclists: Friday

Cargo Bike Food Drive: June 9

Gears, Beers and the Whole Hog: June 13

Trail Building at Heil Ranch: June 18

Bike to Work Day: June 26

Clips Beer and Film Tour: June 28

Fans of spandex and pedal pushers alike will come together Sunday to kick off a month-long celebration of Boulder's unique and nationally recognized bicycling and pedestrian culture.

The 16th annual Circle Boulder by Bicycle fun ride begins at Scott Carpenter Park at 30th Street and Arapahoe Avenue between 3 and 4 p.m. Sunday.

Riders can choose from two self-guided routes, the 26-mile B-360 loop or the 16-mile B-180 loop. Upon completion, participants will be welcomed with a free post-ride party that begins at 5 p.m.

"It's a great tour of the greenways system and how the path network connects," said Sue Prant, spokeswoman for Boulder's Community Cycles.

The route changes every year to showcase new paths and features of the greenway network. Two new trails on this year's route include one connecting Baseline Road to the Millennium Harvest House Boulder and one connecting 26th Street with Palo Park.

This year's ride is dedicated to Leslie Bohm, a local bicycle advocate and founding member of the Bikes Belong coalition who passed away last August after a 20-month battle with brain cancer.

Sunday's fun ride is only the first of more than 60 free events scheduled throughout June for Boulder's 37th Walk and Bike Month, coordinated by Community Cycles, a local bike advocacy nonprofit group, and sponsored by the city of Boulder.

Bike to Work Day on June 26 is the main event, with 5,000 estimated participants biking or walking to work. There will be 51 breakfast stations around town to reward those who take part, with the potential of winning prizes for those who register their commute online.

Other events include mountain bike rides, running races, scavenger hunts, historical bike tours and hikes, as well as more leisurely celebrations about town.

On June 13, Rocky Mounts is holding "Gears, Beers and the Whole Hog," a pig roast with a guest chef and bartender. Admission is half-price for those who come on bike.

On June 28, New Belgium Brewery will host "an evening of cycling-friendly films" and 16 tap beers at the Twenty Ninth Street mall as part of the Clips Beer and Film Tour. Both events support Community Cycles and Walk and Bike Month.

Boulder's commitment to bicycle friendliness has earned a Platinum Bicycle Friendly Community designation from the League of American Bicyclists. Criteria for the designation includes infrastructure, policy, encouragement and participation.

"From the city of Boulder's perspective, (Walk and Bike Month) is a way to encourage community connections and healthy lifestyles," said Nick Grossman, spokesperson for the city's Public Works Department.

According to Grossman, the city also uses participation in Walk and Bike Month to measure community interest in these activities, which is, in turn, used in transportation planning. In other words, the level of community participation can affect how the city delegates priority and funding for bike and pedestrian infrastructure versus roads or other projects.

For this reason, organizers particularly encourage people to register their commitment to bike or walk to work on June 26. Prant said, "Registering is a vote for biking and walking in Boulder."

Prant said Boulder accounts for about a quarter of the roughly 20,000 Bike to Work Day participants in the Denver metropolitan area -- a huge proportion when the city's population only represents about 3 percent of the region.

If you ask Max Verhaeghe, bike mechanic at Full Cycle, what makes Boulder such a bike mecca, it's the city's path system.

"Cyclists are afraid of sharing the road with cars because cars are killers," Verhaeghe said. "You can have good laws and good people, but if you don't have that infrastructure, people aren't going to bike to work."