When is the best time to apply?

It depends on the season:

Summer: Hiring often begins in November, peaks in January–March, and continues into spring.
Fall/Winter: Hiring begins around June–July and continues into fall and winter.
Year-round: Can be posted anytime a position becomes available.
Help Wanted Now!: Immediate or near-term openings.

Seasonal employers also experience attrition throughout their season, so new opportunities appear regularly.

Best time to apply: https://www.coolworks.com/resources/the-best-time-to-apply/