I've also heard that the spawn starts when the "daylight" is 13.5hrs long .... as in from sunup to sundown. In that case the 13.5hr daylight stretch will occur around April 23rd.
It's also of note to remember that surface temps are what is usually reported, but Crappie don't spawn on the surface. The water temps down 3-5ft could be several degrees colder than the surface.
Banks on the West side of a lake will receive the longest period of Sunlight, thus warming up first. But, also rocky banks & banks with dark bottoms will warm up quicker. Dirty or murky waters warm faster than clear or lightly stained waters, but usually just on the surface ... and that can give a false idea of when the spawn is taking place if one goes by surface temp readings alone.
Just my opinion, so take it FWIW.



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