I'm out on the San Mateo Coastside, so many of my days are 10 degrees cooler than in Nate's 'hood - although the nighttime lows are probably comparable. I've got a couple of small Pitangatuba plugs - as well as a CORG - from Adam at FFF. They overwintered with no overhead protection without incident, and all are slowly putting out new growth now.
Don't know where you are in MP - if you're in the flats toward the Bay, no worries. Further west toward 280 and Portola Valley / Ladera definitely sees more hard frost than I do, but Eugenia, Plinia stay manageable in pots for so long that moving them to occasional shelter isn't much of a chore - even without a greenhouse.