In another loosening of the rules, the youngest schoolchildren have been allowed to return to on-site classes.
Prime Minister Mateusz Morawiecki announced last week that coronavirus restrictions would be relaxed from Tuesday in several stages after a fall in new infections and amid increased supplies of vaccines.
He told reporters at the time: "I daresay the worst is behind us in terms of infections."
Under government plans, pupils of all ages will return to on-site lessons by the end of May, while gyms will be allowed to open and restaurants will be able admit guests to half capacity.
Officials on Monday reported 2,525 new coronavirus infections and 37 more deaths, bringing the country's total number of cases during the pandemic to 2,805,756 and fatalities to 68,105.
On April 1, the Polish health ministry confirmed 35,251 new single-day cases, the most since the pandemic hit the country more than a year ago.