Like Mamuang, I saw AntMary’s post and grafted early (a few days before I started apples and pears), on 4/16. It’s been almost a month now and most look pretty good. This is the first time I’ve grafted cherries- I’ve done the other stonefruit before, so I figured cherries could be a bit tricky, but so far, so good.
Some sweet cherry grafts on a Newroot1 rootstock (left over after the Black Tartarian died):