Having cold storage techniques to accumulate, store and ship beneficial insects is especially important when commercial entities are compelled to maintain production of insects as a profitable enterprise. We are developing cold storage methods to facilitate the mass-rearing of, Gonatocerus ashmeadi, an egg parasitoid that attacks the glassy-winged sharpshooter (GWSS), an insect vector of Pierce’s Disease of plants. Holding GWSS eggs at 10ēC for 8 days is lethal, yet hatching occurs within 30 days if storage is at 13ēC. This study shows that killing eggs by placing at 2ēC for 5 days before storage at 10ēC is an acceptable means for preserving hosts for parasitism by the wasps. We determined parasitism rates and progeny emergence from GWSS eggs that developed 1, 3, 5, 7 or 9 days before storage up to 65 days and exposure to wasps. Parasitism and progeny emergence was highest for eggs stored as either 1- or 3-days-old. For these two groups, we also observed that there was a linear negative correlation between parasitism and progeny emergence vs. storage time. Parasitism and progeny emergence remained at acceptable levels for 1-day-old eggs up to 20 days in storage (90 and 76%) but after 65 days they fall to 45 and 28%, respectively. Quality assessment testing of wasps reared from 3-day-old eggs stored for 55 days showed that the lifespan and fecundity did not differ from that of wasps reared from untreated eggs.