The last few days have been back in the 70s after the long early April cold snap. We still are not sure how far along the fruit tree blossoms were when the cold weather came (teens at night and 3 days without getting above freezing). We should know in a few days to week or so if they saved the flower buds.
The rhubarb will be fine, it’s already sending up new growth from the growing point, even though the first few leaves are brown and dead.