The following are the top five hiking trails in Boulder, Colorado, as assessed by recent Trip Advisor reviews: 1 – Flatirons The Flatirons are a group of rock formations in the western United States, near Boulder, Colorado, that are made up of flatirons and other irregular shapes. A group of five huge, numbered Flatirons may be found on the east slope of Green Mountain, running north to south from north to south. The phrase “The Flatirons” is sometimes used to refer to just these five Flatirons. The First and Second Flatirons Loop is a 2.7-mile widely traveled loop route situated... Read More