What kind of rose plants do I have?

Question

Dark yellow blooms.
Very thorny
Are about 12-18 inches tall.
There are 6 rose plants on the east side of my house.
They are each growing about a foot apart with no overlapping.

Answer 1

They sound like young hedge roses. Yellow is one of the newer colors in hedge roses. If you don't think this is it go to a L&G center that has a reference materials area and look at some of the books with rose "varities". If you can't find a L&G with a library ask them for local "rose clubs" and get in touch with them.