Boulder residents braved the waters of Boulder Creek Friday morning for the city's annual tube to work day.

Boulder’s Walk and Bike Month began as a single day of bicycling events in 1977 and has grown to a monthlong celebration, according to the program’s website.

Cycle to Work, Then Take These Ten Boulder Bike Routes for a Spin Thousands of cyclists will take over local lanes and paths in honor of Bike to Work Day. Next, try these rides through the foothills.

Boulder World Tubers are sponsoring “the world’s greatest traffic jam,” and a unique way to get to work with their Tube to Work Day, beginning at 7 a.m. Friday. Tubers meet at Eben G. Fine ...

A bunch of the 25 rides can be done from anywhere in the city of Boulder with a spare hour or two — such as Linden (#12), Bow Mountain (#20) and Chapman (#16) — but the most rewarding for me ...