From Robbins and Easterla:

Green-backed Heron (before the name change)
Earliest dates in the south: 1, 1 Apr 1988, Duck Creek (BRE - Dr. Bill) 
Earliest dates in the north:
1, 11 Apr 1965, Spanish Lake, St. L (RA - Richard Anderson)
1, 11 Apr 1982, Squaw Creek (FL - Floyd Lawhon) 

Think it would be a sure bet those dates have been beaten since 1992.

Charlene Malone
St. Louis co. 

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