| Time | Event |
| Around 11:10 a.m. | Ramos shoots his grandmother. He then texts a 15-year-old online acquaintance in Germany, tells her that he shot his grandmother and is headed to attack a school. He takes his grandmother's truck and drives towards Robb Elementary School. |
| 11:28 a.m. | Ramos crashes his grandmother's truck into a ditch near the school and exits the vehicle, armed, leaving one rifle by the truck. He begins firing shots at two men arriving on foot from a nearby funeral home. They run back to the funeral home uninjured. |
| 11:30 a.m. | First 9-1-1 call placed by a teacher who saw Ramos, while the U.S. Marshals Service received a call for assistance from a Uvalde police officer. The teacher enters the school through its west entrance door, and shuts it. The door remains unlocked because it can only be locked from the outside. |
| 11:31 a.m. | From outside the school, Ramos initiates gunfire, with some bullets penetrating classroom windows a minute later. |
| A Uvalde Consolidated Independent School District (UCISD) officer arrives at the school, having heard the 9-1-1 call. He drives past the gunman, and misidentifies a teacher as the gunman. |
| 11:33 a.m. | Ramos enters the school through its west entrance door, walks through the hallway and shoots into interconnected classrooms 111 and 112 from the hallway, then enters, exits and re-enters classrooms 111 and 112. He proceeds to fire over 100 rounds in four minutes within classrooms 111 and 112. |
| 11:35 a.m. | Three UPD officers with two rifles enter the school from its west entrance door. They are followed eight seconds later by another three UPD officers and one UCISD officer. |
| 11:36 a.m. | Within five seconds of the first three UPD officers' entry, UCISD Chief Arredondo, along with another UCISD officer and two UPD officers, enter the school through its south entrance door. |
| 11:37 a.m. | Ramos' gunfire grazes two officers in the hallway. |
| 11:40 a.m. | Arredondo calls the UPD landline, stating, "We have him in the room. He's got an AR-15. He's shot a lot ... we don't have firepower right now ... It's all pistols ... I don't have a radio ... I need you to bring a radio for me, and give me my radio for me ... I need to get one rifle ... I'm trying to set him up." At other times during the call, he says, "I need this building surrounded ... with as many AR-15s as possible," and asks for a police SWAT team to be set up on the south side of the school. |
| 11:41 a.m. | While on the line with a dispatcher, a UPD officer says, "We believe that he is barricaded in one of the offices. There's still shooting." When asked if the room's door is locked, a UPD officer replies: "I am not sure but we have a Halligan to break it". |
| 11:42 a.m. | A teacher reportedly texts someone to inform them of an active shooter on the school campus. |
| 11:43 a.m. | The school announces their lockdown "due to gunshots in the area," via Facebook, adding, "students and staff are safe in the building." |
| 11:44 a.m. | Officers request more resources, equipment, body armor, and negotiators; the evacuation of students begins. |
| 11:52 a.m. | A ballistic shield is brought into the school from the west entrance door. A second, third, and fourth ballistic shield are brought into the school at 12:02 p.m., 12:03 p.m., and 12:20 p.m., respectively, from the west entrance door. |
| 11:58 a.m. | A DPS special agent states, "If there's kids in there, we need to go in there," to which another law enforcement officer replies, "What's that? If there's kids in there, we need to go in there," the DPS special agent repeats. "Whoever is in charge will determine that," an unknown officer says. This recorded exchange is included in the released video. |
| 12:03 p.m. | Nineteen law enforcement officers gather in the hallway to the classrooms but do not enter the classroom Ramos is in because the alleged incident commander, Pedro Arredondo, was treating the situation as one with a "barricaded subject" instead of an "active shooter". On June 10, 2022, Arredondo told CBS News that he did not know he was the incident commander at the time. It has been alleged that Arredondo believed no more lives were at risk and that he wanted more equipment and officers before conducting a tactical breach. |
| A female student calls 9-1-1 from classroom 112, identifying herself and the classroom number; she ends the call after 1 minute 23 seconds. |
| 12:10 p.m. | The first group of deputy U.S. Marshals arrives at the school to assist. The female student from classroom 112 calls 9-1-1 a second time. |
| 12:12 p.m. | Uvalde Police Department's acting chief, Lieutenant Mariano Pargas, is told by an officer of his department that a "child called 911 saying the room's full of victims." Pargas then enters the school and tells officers there: "A child just called that they have victims in there," then leaves. |
| 12:13 p.m. | The student in classroom 112 calls 9-1-1 a third time, reporting multiple people dead in the classroom. |
| 12:14 p.m. | Arredondo instructs officers to position a sniper on the east roof. |
| 12:15 p.m. | Some members of the Border Patrol Tactical Unit arrive at the school with tactical shields. |
| 12:16 p.m. | The student in room 112 calls 9-1-1 for a fourth time, reporting that eight to nine students are still alive in the classroom. |
| Pargas calls his department's dispatchers who tell him that a female student who has been calling from Room 112 said there are eight to nine students still alive in that room. Pargas responds: "OK, OK thanks." In the next four minutes, Pargas tells a Border Patrol officer about injured victims, then talks to a Texas Ranger without mentioning children in the classroom with the shooter. Pargas then leaves the school hallway and does not return. |
| 12:17 p.m. | The school announces on its Facebook page that there is an active shooter on campus and authorities are on the scene. |
| Arredondo can be heard on the body camera footage instructing officers, "Tell them to fucking wait. No one comes in." |
| 12:19 p.m. | A student from classroom 111 calls 9-1-1 but hangs up when another student tells her to end the call. |
| 12:21 p.m. | Four shots are heard from surveillance footage. |
| 12:23 p.m. | Arredondo says, "We've lost two kids. These walls are thin. If he starts shooting, we're going to lose more kids. I hate to say we have to put those to the side right now." |
| 12:24 p.m. | Arredondo tries to talk to the gunman through the wall of an adjacent room, speaking in English and then Spanish, to surrender. He does so again at 12:38 p.m. The gunman, Ramos, never responds. |
| 12:27 p.m. | Arredondo says: "People are going to ask why we're taking so long. We're trying to preserve the rest of the life". |
| 12:28 p.m. | Arredondo says: "There is a window over there obviously. The door is probably going to be locked. That is the nature of this place. I am going to get some more keys to test". |
| 12:35 p.m. | A Halligan tool for breaching is brought into the school from the west entrance door. |
| 12:36 p.m. | The student in room 112 calls 9-1-1 for a fifth time, reporting that Ramos has shot a door. She is instructed to stay on the line and be very quiet. |
| 12:41 p.m. | Arredondo says: "Just so you understand, we think there are some injuries in there. And so you know what we did, we cleared off the rest of the building so we wouldn't have any more, besides what's already in there, obviously." |
| 12:43 p.m. | A student in classroom 112 calls 9-1-1 and asks the operator to send the police now. |
| 12:46 p.m. | The student in classroom 112 says she can hear the police next door. |
| Arredondo says: "If y'all are ready to do it, you do it, but you should distract him out that window." |
| 12:47 p.m. | The student in classroom 112 again asks the 9-1-1 operator to send the police immediately. |
| 12:48 p.m. | DPS Captain Joel Betancourt, on police radio, gives a command to wait: "The team that's going to make breach needs to stand by. The team that's gonna breach needs to stand by". |
| 12:50 p.m. | Off-duty Border Patrol officers use a janitor's master key to unlock the door Ramos has locked, and they enter the classroom while bypassing the UCISD officers. As of June 18, 2022, a conflicting investigative report now states that the door was always unlocked. Ramos, hiding in a closet, kicks the door open and starts shooting at the officers. The officers return fire and kill him. |
