It definitely won't hurt to try and protect them. I had mid to upper 20's back in 2009 and I covered my trees with frost cloths but it didn't save the pannicles, but you are going to be warmer so maybe it will help...I'm sure I'm going to lose all the pannicles that are on the tree now, though I have 3 mango trees that haven't started to bloom yet... we are expected to be 28 degrees Sunday morning and 32 Monday morning. The trees are all too big to protect so I'm just hoping the trees will survive!! Best of luck to all!
But...the good news is these mango trees survived believe it or not
, I lost 2 Lychee trees that year and a 2 very small mango trees.
If you can try doubling or even triple on the thickness of the frost cloth the thicker it is the more protection it will be, of course depending on the size of the tree will determine how much protection you can give it...