noun
autumn, fall
A1
Herbst: masculine noun meaning 'autumn' or 'fall'. Article: der Herbst; plural: die Herbste. Genitive singular uses -es (des Herbstes) and dative singular dem Herbst. Plural Herbste exists but is less common; usually used for poetic or historical senses. Regular declension otherwise.
Examples
Der Herbst ist meine Lieblingsjahreszeit.
Autumn is my favorite season.
Im Herbst fallen die Blätter von den Bäumen.
In autumn the leaves fall from the trees.
Als im Herbst starker Wind wehte, fielen viele Blätter, sodass die Gärtner länger arbeiten mussten.
When strong wind blew in the autumn, many leaves fell, so that the gardeners had to work longer.
Details
Mnemonics
Leaves falling in autumn — associate 'Herbst' with falling leaves
Der Herbst — think of 'der' as the season (masculine)
Notes
Der Herbst. In American English 'fall' is commonly used as an alternative.