Axton Ranch Mountain Park is a previously private property that was donated to the City and County of Denver for its Mountain Park System in 2021. No previous surveys or collections of plants have been documented from Axton Ranch, and therefore a floristic study of the property fills an important gap in biodiversity knowledge. Our goals for this project were to: 1) provide a baseline knowledge of the plant species and communities, 2) document rare plant species, 3) document all introduced plant species, and 4) identify areas of priority conservation concern. This project also allowed us to provide an immersive learning opportunity for high school students in the Denver metro area to broaden participation in STEM from underrepresented groups. A total of 319 unique plant species in 62 families were found, representing approximately 10% of the flora of Colorado. Additionally, two rare species were discovered. The most speciose plant families were Asteraceae (17%), Poaceae (13.5%), Rosaceae (5%), Cyperaceae (5%), and Fabaceae (5%). The majority (88%) of species were native, and only seven species of noxious weeds were found. The majority (31%) of introduced species were Poaceae, and were most likely brought in for hay when the property was a working ranch. Eight community types recognized by NatureServe were also documented. Axton Ranch supported wetlands consisting of three montane wet meadows as well as riparian areas along streams and lake margins in lodgepole pine forests. Together, these areas supported 34 obligate and 35 facultative wetland species. Over 72% of species at Axton Ranch had a Coefficient of Conservatism (C-value) over five, and a Floristic Quality Index of 90 was determined for the overall property. This indicates that Axton Ranch mostly consists of intact ecosystems where ecological processes, functions, composition, and structure have not been (or minimally so) degraded or altered by human stressors. Potential threats to plant communities at Axton Ranch include fire, hydrologic changes, and the spread of noxious weeds. We identified five areas of priority conservation concern that supported rare or noteworthy species. In addition to documenting all plants on the property, we also noted a pond full of neotenic western tiger salamanders. While we cannot quantify the long-term impacts of providing immersive learning opportunities for high school students yet, we do have evidence in the short-term that this opportunity helped direct the paths of at least three high school interns. Two high school interns are now majoring in the natural resources in college, while another is creating an herbarium of local plants for their high school capstone project.