seasonal labor
Refers to work that is available only during certain seasons, such as agricultural harvests or tourism peaks.
He helps on the farm with seasonal labor during the summer.
In this region, there is a shortage of seasonal workers.
パートタイム refers to part-time work in general, while 季節労働 specifically means work tied to a particular season.
臨時雇用 is temporary employment for any reason, not necessarily seasonal.
Compound of 季節 (season) and 労働 (labor).