Credit to @stargirl3 for compiling this list on google sheets… Just pasted it here
Andover: Available on Gateway 5:00 PM ET…FedEx acceptances mailed M10 -> snail mail deny/waitlisted…check email: decision at 5pm, March 10 on Andover web portal
Blair: M10 online admission portal by 7 am-> letter mailed on M10
Brooks: M10 online admission portal by 5 am-> email sent out one week prior to make sure everyone can log in
Cambridge School of Weston : paper mail on M10
Canterbury: M10 email-> Followed by a letter
Cate: Email on M10 -> Followed by a letter
Choate: M10 3:00 PM EST on GoChoate ->Followed by a letter
Concord: Email on M10
Cranbrook: M10 Email @ 12 AM
Deerfield: M10 email between 6:30 and 8 AM EST -> Followed by a letter
Emma Willard: Email on morning of M10
Episcopal: M10 9:00 AM (email)
Exeter: Email on M10 @ 6:00am ET/Exact time frame from email-> Letter/package to follow
George: M10 email and through admission portal
Governor’s: Online @ 12 noon (or 10 am)-> mail sent on M10
Groton: M10 online @ 6:00 PM-> Followed by letter
Hill: Email sent out to make sure portal works -> M10 6:00 AM/3:00 pm on online platform -> letter follows.
Hotchkiss : M10 @ 6:30 AM EST online -> Letter arrive on M10
Kent : M9 Online (email) @ 5:00 PM EST-> Postal letters will be mailed to arrive on March 10
Kimball Union : M10
Lawrence Academy : M10 on Portal 8:00 AM EST-> Letters Mailed on M10
Lawrenceville: M10 @ 9:00 AM EST through Lawrenceville Admission Portal
Loomis Chaffee: M10 @ 8:00 AM through Explore_Loomis (Send an Email with link and time earlier)
Masters: M10 3PM
Mercersburg: M10 @ 12:01 AM-> Letter M10
Middlesex: M10 @ 9:30 AM
Milton-> letter mailed M10 => rejection=email at 1PM + snail mail/accepted=fed ex package on M10
Miss Porter’s: Online on Portal on M9 @ 8:00 PM-> letter mailed M10
New Hampton : M10 or (I am not sure what this means but) -> electronically notified today (3/7) at 6pm
Noble and Greenough: M10 @ 9:00 AM through admission portal
Northfield Mount Hermon: M8 @ 7:00 AM-> letter might be sent out
Peddie: M10 @ 12:00 AM (email)-> followed by a letter
Pomfret: Online @ 12:01am on M10-> M10 snail mail
Princeton Day School: Mailed on M10
St. Andrew’s (DE): Mailed March 10 (link on the google sheets)
St. George’s: emailed at 12:01 AM on M10
St. Mark’s (MA): M10 email @ 6am-> website says mailed M10 (send email to students one week prior to confirm email address. Parents and student emailed acceptance video at 6am for 9th grade)
St. Paul’s: M10 @ 3:00 PM online, instructions sent on M1-> Followed by letter mailed onM10
Suffield Academy: M10 email
Tabor: acceptance letter on M10
Taft: M10 through portal @ 8:00 am (they might send it out at midnight)-> letter follows M10
Thacher: email on M10 @ 4 PM PST
Thayer Academy: Snail mail: acceptance and rejections
Tilton: letter M10 (Tilton has link to get text notice on M7)
Webb Schools (CA): Log in on M10-> followed by email-> Followed by letter
Westminster: Email on M10
Westover: USPS parcel
Williston Northampton: Email on M7-> letter M10 (Email came in at 5pm)
Woodberry Forest-> M10 6 a.m. email-> Followed by parcel about 1 week later
Worcester: Online M14 or M10@12:01 am posted online