The article presents the results of studying the intraspecific variability of Hemerocallis minor under the forest-steppe conditions of Western Siberia in the collection of the Central Siberian Botanical Garden SB RAS (Novosibirsk). The analysis of phenological and morphological traits of accessions from natural populations in Transbaikalia, the Tomsk oblast, and Tuva revealed significant intraspecific variability. Regarding seasonal development, substantial differences were observed in the timing of phenophases and the duration of interphase periods, particularly flowering. However, the differences in the dates of mature seeds and the fruiting period were not significant. Morphological differences among the accessions were most pronounced in characteristics of the inflorescence (length, number of flowers), as well as in the height of the floral shoot stalk and the length of the leaves, while the sizes of the flowers and leaf widths showed no significant variation. The obtained data expand the prospects for preserving the gene pool of H. minor in scientific collections and using the species as an early-flowering decorative perennial. This can be achieved, for example, by creating groups and mass plantings of various accessions to ensure a longer flowering period.