Nouns ending in -al, -el, -il, -ol, or -eul are usually masculine.
The whole family: -al, -el, -il, -ol, -eul. All masculine.
Is gel masculine or feminine?
legel
The rule behind it
96.5% of -al / -el / -il / -ol / -eul nouns are masculine
In context
Les plantes ont été endommagées par le gel.
The plants suffered damage from the frost.
La température est aujourd'hui au-dessus du gel.
The temperature is above freezing today.
Le gel causa beaucoup de dommages aux récoltes.
The frost did a lot of damage to the crops.