what type of tree is this?

[Predictable]

we plan to have it removed next month, just wondering what it is.

(i live in southern ontario)

[wapiti1997]

looks like an ash to me, probably black ash in Canada...

[PatM]

Why do you say Black Ash for Canada? Green and White are far more common unless you are in a swamp somewhere. All are being decimated by Emerald Ash borers.
 It doesn't look like Ash to me.

[Predictable]

Why do you say Black Ash for Canada? Green and White are far more common unless you are in a swamp somewhere. All are being decimated by Emerald Ash borers.
 It doesn't look like Ash to me.

so any ideas as to what it might be?

[DavidV]

Well it's definitely some sort of ash. There's dozens of species but black or green are likely.

https://www.uwgb.edu/biodiversity/herbarium/trees/Fraxinus_comparison01.htm

[vtbow]

That url reference rules out black or green ash, since the leaves clearly have long stalks.

The bark doesn't look much like the white ash we have here, which tends to have a small tight diamond pattern with light tan colored ridges.

Could be a young tree before that pattern develops, or maybe it's the angle of the photo, but It's not saying "white ash" to me, from those photos.

[wapiti1997]

Petiole length can vary within a species.  I have green, blue and white that I see every day here, it doesn't look right for white or green to me, definitely not blue.  Black ash is a more northern species whereas Ontario is on the northern extreme for either white or green.

Planted trees can exhibit some weird bark growth when placed outside their comfort zone, so look at the branching, is it opposite or alternate?  If it's alternate you may have a hickory which some of the smoothbark hickories do have a diamond like pattern.

[Dakota Kid]

If it's a white ash it should be in full seed right now. I have one in the back yard that looks just like that one. If it has seeds post a pic and it will help to confirm the ID.

[Marc St Louis]

I was thinking Manitoba Maple

[Dakota Kid]

Also the underside of the white ash leaf is how it got it's name. It should be significantly lighter in color.

[PatM]

Green Ash has a lancelote  leaf variation that looks similar but the bark doesn't look right.
 Ash grows considerably North in Ontario.

[Dakota Kid]

It could be a hybrid or foreign ash if it was a nursery tree. If it has both male and female flowers chances are it came from a nursery.

[Joec123able]

Green, orange, red, yellow, purple, black, grey, rainbow, tie dye blah blah, it's ash so cut it down and make some bows out of it.