- Spring 1947 - Walt Sanders runs away from home and looks for work at the Atomic Malt Shoppe, where Roy Bronson offers him work on the Long farm.
- June 14, 1947 - An alien ship crashes in Roswell, New Mexico. Hector Valenti dies. Nora and Louise escape with the pods containing their children, and Roy and Walt help them hide.
- July 17, 1947 - For Project Shepherd, Lt. Col. Harlan Manes oversees a recorded autopsy of an alien from the crash at Roswell.
- October 1948 - At the fair, Nora wins first prize in the pumpkin-chunkin contest. A photograph of her, Roy, and Walt is taken for the paper.
- October 12, 1948 - The Gazette prints the photograph and the story. Harlan Manes shows the paper to Tripp and they plan an attack.
- Unknown date, 1987 - Harlan and Jesse talk for the last time at the Crashdown Cafe.
- June 14, 1997 - At the approximate age of 7, Max, Isobel, and Michael awake from their pods in the Turquoise Mines. They are found walking naked down the road. Deputy Michelle Valenti answers the call.
- Unknown date - Max and Isobel are adopted by Ann and David Evans. Michael goes into the foster system.
2001 or 2002 Edit
- Unknown date - At the age of 11, Michael is moved from Santa Fe to a new foster home in Roswell.
- Unknown date - Michael is subjected to an exorcism.
- A week later - Max, Isobel, and Michael go camping for their fourteenth birthday. A drifter attacks Isobel. (Note: If the three use the day they were found as their birthday, then this would be c. June 14, 1997.)
- Liz Ortecho has her quinceañera (fifteenth birthday) at the Crashdown Cafe. Rosa gets high and pukes on Alex Manes' shoes.
- Unknown date - Liz wipes hot sauce from Max's lips, and he causes a blackout at New Roswell High School.
- Unknown date - Max and Michael shoot cans at Sanders' Auto with Isobel. (Note that it is unknown if this happened before or after the high school blackout.)
- Unknown date - Michael "borrows" Alex's guitar. Isobel blows off Rosa at the Crashdown.
- May 17, 2008, Saturday - Prom Night at New Roswell High School.
- May 18, 2008, Sunday - Isobel wakes up at Sanders' Auto after blacking out with Rosa.
- June 7, 2008 - Kate Long and Jasmine Frederick vandalize Rosa's car. Liz and Max go to the desert. Michael and Alex kiss for the first time, and Jesse damage's Michael's hand. "Isobel" kills Rosa, Kate, and Jasmine. Max and Michael help cover it up as an accident. (The exact date is inconsistent. It's June 1 in the pilot, and June 7 in later episodes, and June 8 in one episode.)
- A "few days later", Liz leaves town.
- June 2008, unknown date - Class of 2008 graduates at New Roswell High.
- June 2008, unknown date - Rosa Ortecho's funeral.
- Unknown date - Jim Valenti nearly loses re-election for Sheriff when Jesse Manes promotes a candidate against him.
- Feb 14, 2014 - Jim Valenti has a CT scan following a bike accident. The scan shows no abnormalities.
- Unknown date - Jim Valenti encounters Subject N-38 at Caulfield prison.
- March 1, 2014 - Jim Valenti is diagnosed with brain cancer.
- May 5, 2018, Saturday - Hank Gibbons is arrested for a drunken disorderly after getting into a fight at the Wild Pony. Carla, a murder victim, was last seen alive there.
- May 11, 2018, Friday - Carla's body is found.
- May 2018 - Liz leaves her fiance Diego in Denver.
Note: These dates take June 7 as the day of Rosa's death.
- May 31, 2018, Thursday - Liz returns to Roswell. (Episode 1.01 Pilot.)
- June 1, 2018, Friday - Handprint appears. (Episode 1.01 Pilot.)
- June 2, 2018, Saturday - Max shows Liz the pods. High school reunion. Manes tells Kyle about Project Shepard. (Episode 1.01 Pilot.)
- June 7, 2018, Thursday - The ten year anniversary of Rosa's death. (Episode 1.02 So Much for the Afterglow.)
- June 8, 2018, Friday - Liz and Max meet at sunrise. (Episode 1.02 So Much for the Afterglow.)
- Unknown date - Liz does tests on Max. Max causes a town-wide blackout. (Episode 1.03 Tearin' Up My Heart.)
- Next day - (Episode 1.04 Where Have All the Cowboys Gone?)
- Next day - Isobel wakes up in the desert. Wyatt Long attacks Liz and Grant Green, and Max is shot. (Episodes 1.05 Don't Speak.) Max tells Liz about what happened the night Rosa died. (Episode 1.06 Smells Like Teen Spirit.)
- A week later, Saturday - Liz and Max are questioned about the shooting. Liz spends time with Maria, Alex, and Mimi. (Episode 1.07 I Saw the Sign.)
- Unknown date - Isobel has Kyle inject her with the serum and she goes back into the alien pod. Jesse Manes leaves town. (Episode 1.08 Barely Breathing.)
- Six weeks later, Saturday - Isobel is still in the pod. Liz and co go to Texas to see the faith healer Arizona. (Episode 1.09 Songs About Texas)
- Next day, Sunday - Noah finds the pods and calls off the search for his wife. (Episode 1.09 Songs About Texas)
- Same day or next day - Isobel comes out of the pod and Liz administers the antidote. There's a shooting at the hospital. (Episode 1.10 I Don't Want to Miss a Thing)
- Unknown date, within a few days - Grant Green's UFO Emporium Grand Reopening Gala. (Episode 1.11 Champagne Supernova)
- Three days later - Noah comes out of the pod. Michael, Alex, and Kyle investigate Caulfield prison. (Episode 1.12 Creep) Max and Michael face-off. Max kills Noah. (Episode 1.13 Recovering the Satellites)
- Next day - Max heals Michael's hand. Isobel and Michael find Noah's pod. Max resurrects Rosa and dies of power overexertion. Isobel exercises new powers. (Episode 1.13 Recovering the Satellites)
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