If you are a fan of wildflowers, you cannot miss the opportunity to visit the wildflower capital of Colorado, Crested Butte. In particular, the Snodgrass Mountain meadow and Brush Creek/East River Trail had the best displays of wildflowers at this time. You can see hills blanketed with a variety of wildflowers and rare flowers such as the Monument Plant in abundance.
Rabbit Mountain features several trails where you can hike, bike, or horseback ride. For hiking, the Eagle Wind Trail loop hike is most recommended by locals. This hike features wildflowers, wildlife, and views of the Rocky Mountains.
Interim Joder Trail is a pleasant hike with some nice views, but the wildflowers were definitely the highlight of the hike. If you are a fan of wildflowers, I would recommend taking a short hike along this trail.
This loop around Homestead Trail and the Mesa Trail, with some added mileage on the Shadow Canyon South Trail is a relatively easy hike of 4.15 miles with a total of 800 ft elevation gain. These trails, located in South Boulder, provide lush green scenery at this time of year with beautiful views of the mountains, including the Flatirons, as well as an abundance of wildflowers.