The last time no illegal crossings by irregular migrants were recorded was on February 23.
Latvia has reported no attempted illegal crossings for three consecutive days, and Polish border guards on Wednesday sent 20 irregular migrants back to Belarus.
In Lithuania, the daily number of attempted illegal crossings from Belarus fell to less than 10 or 20 this week, from several dozen at the end of last week.
A total of 1,281 people have been prevented from crossing from Belarus into Lithuania at non-designated places so far this year.
Lithuanian border guards sent over 8,100 people back to Belarus between last August, when they were given the right to deny entry to irregular migrants, and December. However, the number includes repeated attempts by the same people to cross the border.