HYB: seed planting

I got a question offlist - what's the latest month of planting outdoors that folks in zones 5 - 9 have gotten successful germination of TBs the following spring?
I figure the answer depends entirely on which parents are being used - at least that's my experience with the refrigeration technique and outdoor germination.
But we all know my experience is limited to iris hell - so this question is for people in more "normal" iris growing areas in a "typical" winter. 

Whatever <that> means anymore! ;-)
--
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.DiscoverET.org/etis>
Region 7, Kentucky-Tennessee <http://www.aisregion7.org>
American Iris Society web site <http://www.irises.org>
talk archives: <http://www.hort.net/lists/iris-talk/>
photos archives: <http://www.hort.net/lists/iris-photos/>
online R&I <http://www.irisregister.com>

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