Im probably being a bit over paranoid here.....
Everything is starting to bud burst here. My Toka Plum, John Pear, goose/Jostaberry, evans cherries, issai and "arctic beauty", and my grapes.
Some are further along then others. The goose/josta berry already burst, but havnt opened as of yet. My john pear has inch long buds (I think the flower buds), The Arctic beauty has nice fat buds, as well as the Issai.
Im aware that many fruit tree flowers can take down to -5C no problem. My Honeygold apple took a bit colder then that, and still flowered quite well.
We are supposed to go down to -3C for a night and an just double checking that everything should be ok. Lots of this stuff ive never grown before, so im not 100% sure what to expect in terms of bud hardiness