It is always possible to find the striped phase King (this is tentative). The thing about western San Diego is that they are common there. About 1/3 of kings found are striped phase. A question, Isn't Corona in Riverside Co.? If that is the case, you would be located near the northern limits of the Pennisular Range.
:Anyone know the nothern limit of the Striped Phase California Kingsnake? I am located in Corona Ca. Right on the northern edge of the Transverse Mountain Range. I grew up herping in the San Gabriel Foothills and never found any striped Kingsnakes in that area. I would like to know if there is any possibility of locating this morph in my area?