If you are referring to a secret rapture then it will never happen, because that teaching is false. However, the Bible does tell us when God's people will be raised up; and that will be when Jesus returns:
"For this we say to you by the word of the Lord, that we who are alive and remain until the coming of the Lord will by no means precede those who are asleep. For the Lord Himself will descend from heaven with a shout, with the voice of an archangel, and with the trumpet of God. And the dead in Christ will rise first. Then we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air. And thus we shall always be with the Lord." (1 Thessalonians 4:15-17 NKJV)
Note: Precious100, it is a shame that someone gave you a negative mark for clearly spelling out what the Bible teaches on this subject. Yet it is to be expected; and I won't be surprised if I get some too.
"For the time will come when they will not endure sound doctrine, but according to their own desires, because they have itching ears, they will heap up for themselves teachers; and they will turn their ears away from the truth, and be turned aside to fables." (2 Timothy 4:3-4 NKJV)