Cryostorage of reproductive potential, in the form of ovarian cortex, for young women about to undergo cytotoxic therapies has been offered clinically for some time. However, the prospects of re‐establishing reproductive function using this tissue remain unclear. We now report reproducible follicular development, oocyte retrieval and embryo development following heterotopic grafting of cryopreserved ovarian cortex which had been stored for over 10 years.