Your location will be cold enough for tulips if you planted them in the fall, or they were from last year in the ground. From 6 to 12 weeks at 40 degrees works well here in the refrigerator and I am sure you can top that outside in Ohio. Al

Tulips don't need a good freeze, they need a long period of relatively cool conditions, say below 45F. Remember that the relevant temperature is deep in the soil where the bulb is. Tulips do great here in England where the soil rarely freezes for more than a few hours, and never freezes at the depth of most tulips, but the soil stays fairly cold from about October until March or April.

Thanks for the info. I noticed a few are already growing. Late Feb. was the earliest I've ever had tulips grow.