The sixth 節気 “sekki” division of the traditional Japanese calendar is:
‘grain rain’ (solar term)
The second “kō” microseason within this division is:
(しも やみて なえ いずる)
“shimo yamite nae izuru”
Last frost, rice seedlings grow
That makes 霜止出苗 the seventeenth microseason of the year!
It typically lasts 25~29 April.
Image credit: JapanVisitor.com.