Looks more peach-ish or plum-ish rather than apple-ish to me.

I'm thinking maybe Prunus serotina.

where are you ...

being inches from that fence.. aka a perch for a bird ... i could bet how the seed got there .. lol ... pre fertilized ...

in the alternative ... wind borne seed could have hit the dead space near the fence ...

frankly ... it took me a years ..... but i came to understand.. that there arent many trees that self sows themselves in your garden.. that are worthwhile ... usually because once you find one.. you start finding a lot ...

ken

I agree with Embothrium. Couldn't swear to it though. They are like weeds where I live. But in my opinion they are a beautiful and worthy tree so I keep a few here and there. Even though I have to pull many unwanted seedlings it's worth it.

whether or not it is a useful tree .. depends on your yard size.. and your garden ... and perhaps.. where you are ...

if in fact.. the seed shot out of a birds butt ... that might mean its a messy tree ... and that it has the potential to be a PIA ...

i have serotina all over my 5 acres ... the flowers smell like dirty gym socks .. and the bigger the tree gets.. the bigger the stink ... the fruit is useless in that the pit is 95% of the cherry .. and all its good for.. is for birds to eat and spread for a half mile around the house ... out here in the country.. the birds have plenty to eat ... i really dont see why they need these trees ... unfortunately.. i have a dozen 60 footers.. and there is nothing i can do about it ... except encourage the hate .. lol

if i were on a small suburban yard ... i would be very leery about encouraging it ... its not all that expensive to buy a good heirloom tree for that purpose ...

ken