Buy the 2015 Old Farmer's Almanac!
It does occur in SanIt does occur in San Francisco sometimes, maybe because we are not inland where it warmer...? Last year frost killed my Lilies. Now if I could just remember the dates... :(

2015 Garden Calendar2015 Weather Watcher's Calendar2015 Recipes Calendar2015 Engagement Calendar 2015 Everyday Calendar2015 Country CalendarNew Year Cross StitchLobster Rope Doormats