Cf: It is no time to stoop when the head is off (Br.). It is too late to close the barn door after the horse has bolted (Br.). It is too late to lock the stable door when the steed is stolen (Am., Br.). It is too late to spare when the bottom is bare (Am., Br.). It is too late to throw water on the cinder when the house is burned down (Am.). When the devil comes, it is too late to pray (Am.). When the house is burned down, you bring water (Br.)
Русско-английский словарь пословиц и поговорок. Академик.ру. 2013.