This PBS wiki page features Crocus species A-H that bloom in the fall.
Crocus index – Fall Blooming Crocus I-O – Fall Blooming Crocus P-Z - Spring Blooming Crocus A-I – Spring Blooming Crocus J-S – Spring Blooming Crocus T-Z
Crocus asumaniae from S. Turkey where it is found in evergreen and deciduous oak scrub in limestone has white or pale lilac flowers with a yellow throat. It blooms in the fall with leaves just showing at flowering time and is best grown in a frame or alpine house. Photos by Arnold Trachtenberg and Mark McDonough who writes: "The form I grow is from Jane McGary and it's a lovely pale lilac color. The flowers have a strong sweet fragrance. I find that it grows and flowers perfectly well outside in the garden." His photos were taken mid to late October, 2005.
Crocus banaticus This species, from Romania, blooms in early fall before its leaves. It is very beautiful with long tubed violet flowers and looks a little like an iris. It is best grown in cool moist conditions. The first two photos were taken by Arnold Trachtenberg. The third photo by Bob Rutemoeller looks down on it and shows the lovely center with the divided style. The fourth from Mary Sue Ittner shows a moth resting on the flower after pollinating it. The last is a white form of this species flowered and photographed by Rob Hamilton
Crocus biflorus subsp. melantherus Most Crocus biflorus bloom in late winter (a lot of the cultivars sold as Crocus chrysanthus are actually Crocus biflorus selections and hybrids), but a few forms flower in autumn, including this one. Leaves are slightly visible at flowering. This is one of several plants grown from seed obtained from the Goteborg Botanic Garden. Photo by Jane McGary
Crocus boryi is native to southern and western Greece, some Ionian islands, and Crete. It flowers in late fall. The photo shows the typical flowers, which are cream-white and have rather thick tepals. These plants are grown in a bulb frame in Oregon, from seed obtained from the Archibalds. Photo by Jane McGary
Crocus cancellatus ssp. cancellatus is a fall blooming Crocus from south Turkey that flowers before the leaves or just with the tips showing. It has slender pale blue flowers striped dark violet on the outside. It grows better in the protection of a bulb frame. Photos by Mark Mazer
Crocus cartwrightianus This species is thought to be the source of the sterile triploid Crocus sativus, or cultivated saffron. It is native to Greece and the Cyclades and blooms in the fall after the leaves are formed. The first two plants shown are a clone, CEH613, which is more vividly colored than the typical forms. A white form is also common in cultivation. Photos by Jane McGary, Mary Sue Ittner (with a pollinator), and Michael Mace.
Crocus cartwrightianus 'Albus' Named by W. Herbert in honor of his friend Mr. Cartwright who was on the staff of the British Consulate at Istanbul in the early 19th century. Mr. Cartwright sent corms to Herbert from the island of Tenos. Photo by Arnold Trachtenberg Grown in New Jersey
Crocus goulimyi flowers with the leaves in autumn. There are lilac-blue and white forms with a long slender tube and rounded segments. Native to Greece where it grows in olive groves. The first photo by Arnold Trachtenberg and the second taken by Mary Sue Ittner. The third photo below, by Jane McGary, shows Crocus goulimyi in the wild on the Mani Peninsula, southern Greece, in a pretty combination with a subshrub of the mint family, perhaps a marrubium.
Three photos of this beautiful species by Mark McDonough. The species seems variable, and the form I grow has very broad rounded tepals that overlap. They have a distinct 3-part symmetry about the flowers, reminiscent of Crocus banaticus, the 3 inner tepals white, contrasting richly with the lavender outer tepals. The sweetly fragrant flowers are held on long tubes that are surprisingly weather resistant. The 3rd photo was taken on November 13, 2005, after several nights of hard frost, but still sending up a succession of ethereal goblets.
Crocus goulimyi 'Mani White' was nominated as a favorite white flowered bulb by John Grimshaw who lives in the U.K. He wrote: "I have found to be a very reliable garden plant, forming a clump and coming up with a good tuft of flowers each autumn." Photos by Mary Sue Ittner.
Crocus hadriaticus This fall-blooming species is native to S. and W. Greece, the Peloponnesus, and nearby islands. Flowers are always white, sometimes with a purplish zone at the upper part of the tube on the outside. These photos, taken in Oregon in October by Jane McGary, show a group of plants grown from seed collected in the wild and also a robust clone known in the trade as "var. chrysobelonicus," a name Mathew (1982) does not accept as valid. This is a good garden plant in northwestern Oregon, despite its provenance, which would suggest that it lacks cold-hardiness. Leaves are barely to well developed at flowering.
Crocus index – Fall Blooming Crocus I-O – Fall Blooming Crocus P-Z - Spring Blooming Crocus A-I – Spring Blooming Crocus J-S – Spring Blooming Crocus T-Z
General information about this genus and links to specific species is found in the PBS wiki Crocus page