Welcome!

It would appear that, per WA state law, it is up to your school district what their early entrance policy is. You might want to inquire about that (if you have not already done so), since many districts would place him in the typical range for considering such (BD between 9/1 and 10/31). Not only would that reduce the possible conflict with the district, it might help you to work through the decision-making process. A district early entrance process most likely would include cognitive and academic screening/assessment, and teacher reports from his preschool. Some also have trial placements.

Here are a few sample policies from WA districts:

http://ckschools.org/UserFiles/Serv...y%20Entrance%20to%20K/EEK%20Handbook.pdf

http://www.everettsd.org/Page/4955

(note this page has links to a waiver form for transferring in from private K)

http://www.edmonds.wednet.edu/Page/816

http://www.nthurston.k12.wa.us/cms/...or%20First%20Grade%20-%20%20Brochure.pdf

We went through a similar decision-making process with our #1 (though with a private school, and less extensive testing).

...pronounced like the long vowel and first letter of the alphabet...