"This wouldn't be anywhere near the latest Seattle snowfall, though, according to this "Ask Steve (Pool)" page - which says April 17, 1972, holds that record. (Must have been weird weather times; that same month, a major tornado hit Vancouver, WA."
Found on: http://westseattleblog.com/blog/?p=6529
April 21
May 22, 1964.
According to the National Weather Service Chicago had a trace of snow on May 26, 1889. This appears to be the latest date for snowfall. Last measureable snowfall was .2 which fell on May 11, 1966.
The latest possible date of Easter is April 25.
October 31 1993.
During the Winter of 1933-1934 Pigeon River Bridge received 154 inches of snowfall, the State record for snowfall in one season.
Oklahoma has records of snowfall that date all the way back to January of 1893. The earliest snowfall ever occurring in Oklahoma after this time was on October 25, 1957.
seattle is industrious, so it produces steel and also the latest technological items
Late october to mid november
The Columbus Blue jackets
As of this date, the latest is Marshall with a Chance.
144.4" as of April 1, a couple feet below average.