What are these fruit trees, blooming in October?

[Adam Schneider]

We just bought a house in Portland, OR (Zone 8), and unfortunately the people we bought it from didn't have any clue what they'd planted in their garden -- so we don't know either.

So far, the biggest mystery is a couple of young fruit trees in the back yard that have recently budded and sprouted flowers -- in the middle of October! I think they're some kind of cherry, based on the toothed leaves and semi-double flowers, but I'm not even 100% sure about that.

Can someone who knows more about trees than I do look at these pictures I took today and tell me what these are? And should I be concerned that they're blooming in October?

Photos here:

Thanks,

Adam

[Pam - gardengal]

which, as the name implies, blooms in fall. Also blooms in spring as well. A relatively common tree in these parts.

pam - gardengal

[Adam Schneider]

That's exactly it, Pam. Thanks!

Adam

[Frogleg]

[Adam Schneider]

Just my ancient (4 years old now) Olympus C-2020Z....

Adam