Rare breeding migrant. Inhabits spruce, fir forests, marshy birch groves, subalpine larch forests at 1500-1900 m. On migration occurs in shrubs or forests on plains. In spring arrives in early May – early June, migration finishes mid-June. Main hosts are Yellow-browed and Greenish Warblers. Cuckoo eggs recorded in end of May – early July, fledglings in mid-July – mid-August. Adults leave breeding places before mid-July, juveniles in end of August. On plain recorded until early September.