Southern Ohio (Cincinnati, Portsmouth, and Ashland) is USDA Frost Zone 6a. I have seen estimated last frost dates (10% chance) of April 14th for your area. Based on that information, I don't know if seeds you start now will be ready and bulb in time. But I know very little about onions. I might ask a nursery when they intend to get onion starts (transplants). In Houston, if seeds are supposed to be started on October 15th to reach transplant size by January 30th, then that's 110 days just to get to transplant size.
Neither of those varieties you have mentioned from Baker Creek give any mention of day length, so that makes it hard to know when they can be planted.
The first one is a cipollini type onion which, in my experience, are harvested when they are 1-2 inches across, almost like large boiler onions. Cipollini onions do have a fantastic flavor.
Hopefully someone with more knowledge will chime in here.
