Every country within it's monetary system must choose one of the exchange rate regimes. It selects an exchange rate regime from one of three groups: fixed regimes, intermediate regimes, and flexible exchange rate regimes. The choice of exchange rate regime conditions the possibilities of monetary policy and the central bank in times of recession. The main objective of this paper is to compare exchange rate regimes during economic crises using examples from five post-transition countries: Bulgaria, the Czech Republic, Croatia, Hungary, and Poland. On one side, there is Bulgaria, which fixed the Bulgarian lev to the euro within a currency board system, and Croatia, which directed the movement of the kuna exchange rate towards the euro within narrow fluctuation margins ("quasi currency board"). On the other side are the Czech Republic, Hungary, and Poland with flexible exchange rate regimes, allowing their currencies to float against the euro. The paper examines the limitations of each exchange rate regime individually and the monetary policy instruments that the central bank had at its disposal and used during crises to try to boost the economy. The success of the chosen exchange rate regimes of post-transition countries is analyzed based on the comparison of key macroeconomic indicators. The three most recent economic crises are observed: the financial crisis from 2008. onwards, the COVID crisis in 2020., and the war in Ukraine in 2022. year.