At Marymoor Park (King Co.), we've had Nashville Warbler as early as April
21 and as late as May 10, during spring migration, as follows:

21-Apr-2009
23-Apr-2009
24-Apr-2002
26-Apr-2004
29-Apr-2008
30-Apr-2007
30-Apr-2000
01-May-2008
02-May-2001
02-May-2006
03-May-2008
03-May-2000
07-May-2003
10-May-2000

So we've had at least one sighting every year except 2005. April 18 is only
a little early, based on this data, but still distinctly early.

== Michael Hobbs
== Kirkland, WA
== http://www.marymoor.org/birding.htm
== http://www.marymoor.org/BirdBlog.htm
== birdmarymoor at verizon.net