I know this is an old post, but maybe this info will help. I'm also living in Tulsa and trying to grow raspberries. Everything I've read says that it's too hot in Oklahoma for them. But I've had a little success with Primocane fruting, Fall-bearing raspberries. Try to look for varieties that will ripen September through November; this will allow you to avoid the really hot summer months. Even then, I suggest growing them somewhere that gets morning sun and afternoon shade if possible. I'm growing my raspberries in 10 gallon fabric pots, which works but does require watering twice a day in the summer. Under these growing conditions, a variety called "Crimson Night" will first be ready for harvest in September, but produces heavily in October and into November. I bought mine online from Gurney's. I've also tried "heritage" red raspberries, but they seem to fruit in the summer. I recently purchased a variety called "Southern Baba raspberry" which is supposed to be heat tolerant; however I don't know when exactly the fruit will ripen. If you're still interested, you can buy them at Southwood's Nursury.
