i bought a home with a large grape vine in Ashland, owners are no help with ID..they forget!
I am attaching photos of my grape vine, trying to ID it and hope these photos help you. The grapes are so sweet and very small, such loose clusters--maybe due to my not caring properly for them this spring?
The stem seems to detach with the fruit, and the fruit is very sweet, green inside.
Thanks for using Ask an Expert. I cannot identify a particular variety of grapes from the pictures you included. You could bring a sample of the grapes into the Plant Clinic at 569 Hanley Rd., Central Point. Hours are 10am-2pm M-F and perhaps a specialist could narrow down the possibilities.
If you need information on caring for your grapevine, here is a link to a website: Growing Table Grapes https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/ec1639.pdf