Winter rye will sprout anytime there is ample moisture AND the minimum
temperature is around 40F or less. Both must occur simultaneously.
Generally, there is no too late time in winter.

Winter rye doesn't fare too well in thick foliage soil like St. Augustine
grass, even if dormant. Meant more for bare or sparse foliage soil for
cover in winter.
--
Lil' Dave
Beware the rule quoters, the corp mindset, the Borg
Else you will be absorbed
"cledus" wrote in message
om...
What is the latest that one should plant winter rye in Austin? I'm
considering overseeding my St. Augustine lawn.