If everything goes according to plan, you can expect the SN11 to launch within this window.
Cameron County Judge Eddie Trevino Jr, who ordered road closures around Boca Chica today, said: “Should SpaceX not complete its planned space flight activities on March 30, 2021, then SpaceX may use the alternate date to complete its test launch activities.”
An identical backup window will open on Friday, April 2.
During the test flight, SN11 will launch to an altitude of 32,000ft (10km), using its three Raptor engines.
The spacecraft will then tip over by 90 degrees and fall to the ground belly-side down.