
Sabara was bulletproof.
While I can somewhat attest to that, it has seen 25f a couple times, and two days of snow last year, it is
not bulletproof. It fully defoliates and after the snow this year it has more or less taken a whole year off from fruiting and growing well.
I don't think you're helping these trees at all by leaving them below 40f. They're parked and not growing at all anything below that.
Red, white, scarlet, aureana etc are not as cold tolerant as sabara which, other than Campo Ramon and Grimal, is the only "cold hardy" jabo.