Nouns ending in -al, -el, -il, -ol, or -eul are usually masculine.
The whole family: -al, -el, -il, -ol, -eul. All masculine.
Is hôpital masculine or feminine?
l'hôpital
The rule behind it
96.5% of -al / -el / -il / -ol / -eul nouns are masculine
In context
Il est impatient d'aller à l'hôpital.
He is eager to go to the hospital.
Il était transporté à l'hôpital par hélicoptère.
He was transported to the hospital by helicopter.
Elle est à l'hôpital depuis un mois.
She has been in hospital for a month.