The Adventures of Jay Garrick
I'm Jay Garrick...the real Jay Garrick
In the Arrowverse, Jay Garrick had a truly incredible history. Because not only does his history get quite interesting on one of the main Arrowverse series, The Flash (2014 - 2023), but also on Stargirl (2020 - 2022). Funny enough, his list of episodes on The Flash (2014 - 2023), notorious for numerous time travel sequences, has almost no episodes out of order, whereas they are all over the place for Stargirl (2020 - 2022).
Earth-3 (Pre-Crisis)
Cease reading below if you have *not* seen The Flash season 2! There are huge spoilers.
Jay Garrick lived for years and years as The Flash of Earth-3. At some point, he encountered Hunter Zolomon who locked him up for months, while stealing his identity. Barry Allen aka The Flash of Earth-1 then saved him, and Jay became a great ally to Team Flash all the way up to the death of the original multiverse with the events of Crisis on Infinite Earths.
The Flash 02x13 Welcome to Earth-2
The Flash 02x14 Escape from Earth-2
The Flash 02x15 King Shark
The Flash 02x18 Versus Zoom
The Flash 02x19 Back to Normal
The Flash 02x23 The Race of His Life
The Flash 03x02 Paradox
The Flash 03x09 The Present
The Flash 03x16 Into the Speed Force
The Flash 03x23 Finish Line
The Flash 05x08 What's Past Is Prologue
The Flash 04x15 Enter Flashtime
The Flash 06x02 A Flash of the Lightning
Earth-Prime/Earth-2 (Post-Crisis)
After the Spectre and the Paragons worked together to create the new multiverse, Jay Garrick was reborn on Earth-Prime; as a refugee of his former world, forever gone. He and his wife Joan Williams would start an entirely new life. This timeline...is not quite clear.
Let's start with the easy part. The first time we saw him in the post-crisis multiverse, is on The Flash 07x17 Heart of the Matter, Part 1. In this episode, we learned that he was finally regaining his speed after having been losing it; so much so he was walking with a cane in The Flash 06x02 A Flash of the Lightning. While his speed theoretically could have been lost during his adventures on Earth-2, the only thing we have to go off of is the previous time in which we saw him lose his speed. Thus, the following set of episodes are in both release and chronological order.
The Flash 07x17 Heart of the Matter, Part 1
The Flash 07x18 Heart of the Matter, Part 2
The Flash 08x20 Negative, Part 2
The Flash 09x13 A New World, Part Four
Cease reading if you have not watched Stargirl! There are huge spoilers, from all three seasons.
At some point afterwards, Jay Garrick ended up on Earth-2 with only four remaining episodes now left unaccounted for. It is unclear what order they take place in however for the sake of reliability, we will sort the episodes in chronological order with one exception; his death, in the year 2010. That is because according to Shawn McBee who was chief of canon on Stargirl, Jay Garrick did not survive the fight between the JSA and the ISA.
Many years before 2010 AD
Stargirl 02x09 Summer School: Chapter Nine
In this episode, the JSA defeated the all powerful demon Eclipso by ending the life of a child. This tore the team apart. It stands to reason that this pushed Jay to return to Earth-Prime. However because his next appearance on the series is in the year 2031 where there isn't a sense of surprise from Richard Swift/Shade over Jay being alive, it is safe to assume that in between his return to present day Earth-Prime (a little bit after The Flash 09x13 A New World, Part Four which is set the year it aired; 2023) and 2031, he hopped universes quite a few times throughout the 2020s, 2030s, and 2040s.
2031 AD
Stargirl 03x13 Chapter Thirteen: The Reckoning
2049 AD
The Flash 08x06 Impulsive Excessive Disorder
At some point after his appearance in the year 2049, Jay Garrick went back in time a whole 39 years where he reunited with the Justice Society of America and faced the Injustice Society of America one last time.
2010 AD
Stargirl 01x01 Stargirl
The Justice Society of America would lose that fight. While multiple members survived, Jay Garrick did not. Thus, the life of Jay Garrick came to an end in the year 2010 on Earth-2.