That's up to you, Stella is self fertile, ..it seems you got quite a bit of room so this is what you could do, let your leader come off higher which is better for deer, get another tree and plant it close, now you have two trees side by side and you can compare over the years how they do until they have fruits. Then chop the one down which doesn't perform to your likings.

Gary, I would say the tree is in shock from its sudden change. The only concrete thing you can do at this point is to erect a shade barrier and keep it up for a few weeks while the roots adapt. Just put a sheet on the southern side with some poles to block the direct sunlight for those few weeks. Cherries are northern climate trees genetically and can have difficulty with strong sun. Scott

Thanks CharlieBoring for the thought but we got heavy frosts everyday for two months during winter, sometimes down to -10 so I'm pretty sure it got enough chill. We do get late frosts Franktank232 - I think the last one this year was mid october but I know we got 3 in a row late october last year. I know late frost can damage flowers and stop them setting fruit but would it prevent flowering altogether? Also, I had thought that Stella was pretty much the only self pollinating sweet cherry - not that we chose this one, we only moved into our house a year and a half ago and it was already there where we moved in - what sweet cherry varieties would you recommend? I'd be very keen to get opinions on other options. Thank you both for your thoughtful and quick replies

Cut some of the fallen fruits in half. If no seed, it's pollination failure -- reasons for that include various adverse environmental conditions which prevented fruit set.