Updated May 20, 2013
List of Champions in Order of Last Released Skin: By Release Date
(Not Counting "Legacy Skins" Which Includes Holiday and Retired Skins)
Now Listing Legendary/Semi-Legendary(1350) to Show Once You Get a Legendary You Won't Get a Skin For a Long While
Legendaries will be Highlighted from Now On. 1350's will have the price point Highlighted.
Aatrox- June/July 2013: Justicar Aatrox
Darius- June/July 2013: Woad King Darius
Morgana- May/June/July 2013: Ghost Bride Morgana
Renekton- May/June 2013: Scorched Earth Renekton
Lissandra- April 30, 2013 : Bloodstone Lissandra
Shyvana- April 30, 2013: Ice Drake Shyvana
Volibear- April 30, 2013: Runeguard Volibear
Anivia- April 30, 2013: Blackfrost Anivia(Legendary)
Zac- March 29, 2013: Special Weapon Zac
Draven- March 25, 2013: Gladiator Draven
Nidalee- March 20, 2013 : Headhunter Nidalee
Soraka- March 5, 2013: Celestine Soraka
Quinn and Valor- March 1 2013: Phoenix Quinn and Valor
Blitzcrank- March 1, 2013: iBlitzcrank(1350)
Jayce- February 14, 2013: Debonair Jayce
Annie- February 8, 2013 : Panda Annie
Corki- February 8, 2013: Dragonwing Corki
Cassiopeia- February 8, 2013: Jade Fang Cassiopeia
Jarvan IV- February 8, 2013: Warring Kingdoms Jarvan IV(1350)
Xin Zhao- February 8, 2013 : Warring Kingdoms Xin Zhao(1350)
Garen- February 1, 2013: Steel Legion Garen(1350)
Lux- February 1, 2013 : Steel Legion Lux
Thresh- January 23, 2013: Deep Terror Thresh
Kayle- January 17, 2013 : Aether Wing Kayle(Legendary)
Shaco- January 8, 2013: Masked Shaco
Vi- December 19, 2012 : Neon Strike Vi
Nami- December 7, 2012 : Koi Nami
Nocturne- December 5, 2012 : Eternum Nocturne(Legendary)
Varus- December5, 2012: Arclight Varus
Lulu- November 13, 2012 : Dragon Trainer Lulu(1350)
Zed- November 13, 2012: Shockblade Zed
Elise- October 26, 2012: Death Blossom Elise
Tristana- October 19, 2012: Rocket Girl Tristana
Olaf- October 1, 2012: Pentakill Olaf
Tryndamere- September 27, 2012: Sultan Tryndamere
Kha'zik- September 27, 2012 : Mecha Kha'zik (1350)
Gragas- September 21, 2012 : Oktoberfest Gragas
Jax- September 14, 2012: Nemesis Jax
Gangplank- September 13, 2012: Special Forces Gangplank
Syndra- September 13, 2012: Justicar Syndra
Nautilus- September 4, 2012: Astronautilus(1350)
Ziggs- September 4, 2012: Pool Party Ziggs(1350)
Sona- August 31, 2012 : Arcade Sona(1350)
Rengar: August 21, 2012 : Hunter Rengar
Rammus- August 16, 2012 : Full Metal Rammus
Diana- August 7, 2012 : Dark Valkyrie Diana
Cho'Gath- August 3, 2012 : Battlecast Prime Cho'Gath(Legendary)
Dr. Mundo- July 27, 2012 : Rageborne Mundo
Lee Sin- July 24, 2012 : Muay Thai Lee Sin
Zyra- July 24, 2012 : Wildfire Zyra(1350)
Alistar- July 13, 2012 : Infernal Alistar
Xerath- July 13, 2012 : Scorched Earth Xerath(1350)
Malphite- July 11, 2012 : Glacial Malphite (1350)
Ahri- July 11, 2012 : Firefox Ahri
Teemo- July 9, 2012 : Panda Teemo
Singed- July 9, 2012 : Augmented Singed
Ezreal- June 29, 2012 : Pulsefire Ezreal (Ultimate)
Pantheon- May 30, 2012 : Glaive Warrior Pantheon
Amumu- May 28, 2012 : Sad Robot Amumu(1350)
Swain- May 22, 2012 : Tyrant Swain(1350)
Irelia- May 1, 2012 : Frostblade Irelia(1350)
Galio- April 23, 2012 : Gatekeeper Galio (Legendary)
Shen- April 18, 2012 : Warlord Shen
Hecarim- April 18, 2012 : Blood Knight/Reaper Hecarim
Riven- April 6, 2012 : Battle Bunny Riven
Graves- April 2, 2012 : Mafia Graves
Fizz- April 1, 2012 : Fisherman Fizz
Kog'Maw- March 23, 2012 : Jurassic Kog'maw
Urgot- March 5, 2012 : Battlecast Urgot(1350)
Fiora- February 29, 2012 : Royal Guard/Nightraven Fiora
Orianna- February 29, 2012 : Bladecraft Orianna
Vayne- February 14, 2012 : Heartseeker Vayne
Leona- February 10, 2012 : Iron Solari Leona
Master Yi- February 8, 2012 : Headhunter Master Yi
Poppy- February 1, 2012 : Scarlet Hammer Poppy
Sejuani- January 17, 2012 : Darkrider/Sabretusk Sejuani
Wukong- January 10, 2012 : Jade Dragon Wukong
Talon- January 10, 2012 : Dragonblade Talon
Veigar- January 2, 2012 : Superb Villian Veigar
Katarina- January 2, 2012 : Sandstorm Katarina
Viktor- December 29, 2011 : Full Machine/Prototype Viktor
Kennen- December 29, 2011 : Arctic Ops Kennen
Warwick- December 5, 2011 : Hyena Warwick
Janna- December 5, 2011 : Frost Queen Janna
Akali- November 30, 2011 : Silverfang Akali
Twisted Fate- November 21, 2011 : Musketeer Twisted Fate
Vladimir- November 21, 2011 :Blood Lord Vladimir (Legendary)
Ashe- November 15, 2011 : Amethyst Ashe
Miss Fortune- November 1, 2011 : Mafia Miss Fortune
Fiddlesticks- October 27, 2011 : Surprise Party Fiddlesticks (Legendary at 975)
Caitlyn- October 5, 2011 : Officer Caitlyn
Brand- October 5, 2011 : Cryocore Brand
Malzahar- September 19, 2011 : Overlord Malzahar
Karthus- August 29, 2011 : Pentakill Karthus
Nunu- August 24, 2011 : Demolisher Nunu
Taric- August 9, 2011 : Bloodstone Taric
Skarner- August 9, 2011 : Earthrune/Sandscourge Skarner
Yorick- July 22, 2011 : Undertaker/Pentakill Yorick
Sion- July 18, 2011 : Warmonger Sion
Kassadin- July 13, 2011 : Harbinger Kassadin
Mordekaiser- May 10, 2011 : Lord Mordekaiser
Rumble- April 26, 2011 : Rumble in the Jungle/Bilgerat Rumble
Nasus- April 25, 2011 : Dreadknight Nasus
Sivir- March 21, 2011 : Bandit Sivir
Twitch- February 21, 2011 : Vandal Twitch
Maokai- February 16, 2011 : Charred/Totemic Maokai
Karma- February 1, 2011 : Sakura/Sun Goddess Karma
Udyr- December 6, 2010 : Primal Udyr
Trundle- December 1, 2010 : Junkyard/Lil' Slugger Trundle
Heimerdinger- November 22, 2010 : Pitlover Customs Heimerdinger
LeBlanc- November 2, 2010 : Prestigous/Wicked LeBlanc
Evelynn- October 5, 2010 : Tango Evelynn
Zilean- September 9, 2010 : Shurima Desert Zilean
Unknown Right Now:
The Taipei Assassins Championship Skins:
Nunu
Shen
Ezreal
Orianna
Dr. Mundo
Unknown Price Points/Unknown Availability as of now.
Last Skin Received Outside of Above Was a Holiday Skin/Is Now 'Retired"
This is where champions who have received a skin since, but is no longer available at the current time.
They May Come back any time Riot wants to put them in the store again.
Veigar- December 14, 2012 : Bad Santa Veigar
Katarina- December 14, 2012 : Slay Belle Katarina
Fiddlesticks- December 14, 2012 : Dark Candy Fiddlesticks
Ziggs- December 14, 2012 : Snow Day Ziggs
Maokai- October 26, 2012: Haunted Maokai
Twisted Fate-October 26, 2012: Underworld Twisted Fate
Hecarim- October 26, 2012 : Headless Hecarim
Fiora- October 26, 2012 : Headmistress Fiora
Brand- October 26, 2012 : Zombie Brand (Legendary)
Ryze- October 26, 2012 : Pirate Ryze
Heimerdinger- December 14, 2011 : Snowmerdinger
Le Blanc- December 14, 2011 : Mistletoe Le Blanc
Zilean- April 12, 2011 : Time Machine Zilean
Questionable Returns
The following couple skins, while later than the ones listed at the beginning of the list are unavailable(outside of specific circumstances), and may never be available again.
Riven- Championship Riven. Available to attendees to the Season 2 Finals, and the week following in the store.(Now Gone)
Riot Graves- Current Riot Skin. Available at Conventions, and rarely in store.
Victorious Jarvan- Gold and above in Season One(Most Likely Gone Forever)
Judgement Kayle- Play 10 Games in any mode during Season One(Most Likely Gone Forever)
PAX Sivir- Go to PAX East or PAX Prime
Victorious Janna- Gold and above in Season Two(Most Likely Never Available Again)
I will update this as needed.