Refugees.info.pl - Praktyczne informacje dla uchodźców w jednym miejscu

Every Ukrainian citizen who came to Poland on February 24, 2022 or later and declared their intention to stay in Poland, is allowed to legally stay for 18 months i.e. until August 24, 2023. After the designated time (no matter when the Polish border was crossed) staying in Poland will no longer be legal.
To extend your legal stay in Poland after 24 August 2023, you must apply for a one-time temporary residence permit for 3 years. Such application may be submitted to the voivode in the voivodeship in which you live at the time of applying after at least 9 months from the date of entry, but no later than August 24, 2023.
There is no need for any additional steps for the stay to be considered legal until August 24, 2023. The only thing needed is a stamp on the passport confirming the date of entry.

The main thing is to register an entry on the territory of Poland. If the entry has not been registered by the Border Guard, it may be done upon the application for a PESEL number. But not later than 60 days from the date of entry.
Leaving the territory of Poland for more than 1 month takes away the right to stay for 18 months.
A Ukrainian citizen protected by the Special Act will be able to obtain a temporary residence permit for 3 years. The application may be submitted not earlier than 9 months, and not later than after 18 months of staying in Poland from 24/02/2022

The stay in Poland is legal for 18 months from 24/02/2022 until 24/08/2023 for: