Check out the Explorer and Parkland Canadian roses if you want own root roses that don't need winter protection. Some are hardy to zone 2, 3, 4. I only protected Jens Munk and William Baffin the first year. They remained cane hardy to the tips without protection.
Here is a link to the Canadian Explorer roses by Dr. Svejda. John Davis is pale pink, but I don't grow that one.
http://www.helpmefind.com/gard...
Chamblees carries a lot of the Buck roses. i grow Honey Sweet, but it isn't pale pink. Some of them are, but I forget their names.
If you are just starting to grow roses, start with varieties that you know will be successful in your climate. You will save yourself the grief of mourning dead sticks in the spring. Once you gain more experience, you can try some more adventurous choices. I was discouraged by my early rose growing efforts because they didn't survive the winters, even with protection. I got an own root Austin Wildeve rose by sheer luck at Walmart in a pot. I happened to be there when they were unloading fresh roses. My friend saw it and said it was my kind of color - a soft warm pink. I googled the rose, found the plant files and found other rose fanatics in cold climates.
MO is going to be colder than PA (I'm zone 6a) but wetter than CO. I think Skiekitty has more snow cover than I do. I have wet winters with lots of freeze/thaw cycles. We get the "wintery mix" of snow-ice-freezing rain. February and March can get days in the 40s and nights in the 20s. Grafted roses freezing and thawing daily in soggy clay soil aren't happy. My hardy own root roses don't mind. Digging deep holes is a challenge for me in my rocky mountain soil. Other gardeners in this area have success with grafted roses in raised beds.
We have that five petaled white wild rose here also. A bird planted one in my garden. I dug it out last year. I think it is really pretty in a wild setting - It has huge arching canes that are blooming this time of year. It would overpower a garden. I kept a piece of the one from my garden in a big pot. It isn't happy in the pot, maybe I should plant it in the woods by my new place.