You can begin grafting in March normally. Prunus americana rootstocks for plums seem to work best. Callery , bet, Ohxf rootstocks are best for pears. Mm111 are best for apples. Mahaleb work great for cherries but i prefer growing cherries like montmorency or canadian cherries eg. Carmine jewell on their own roots. I skip the mahaleb and ohxf rootstocks most of the time. I’m not saying they dont work but what i use works better for me. Here is an example of March grafts Top working Pears weather permitting you can graft much later as shown here Grafting large Callery and BET pear rootstocks in 2022
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