Neither NCBI nor Ensembl have a genome project listed for any crocus species, although individual ethidium bromide stained nuclei have been analyzed by flow cytometry, revealing approximately 11.4 pg of DNA per nucleus (warning, pay wall).
_C. sativus_ is triploid, giving it a C-value of 3.8 pg which works out to a haploid genetic content of about 3.45 Gbp.
(full credit to canadianer for finding the Brandizzi paper)